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Journal articles on the topic 'Higgs, Bosons de'

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Published: 4 June 2021

Last updated: 4 May 2024

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1

Yong, Taiyi. "Some Basic Properties of Higgs Bosons." Highlights in Science, Engineering and Technology 17 (November 10, 2022): 324–27. http://dx.doi.org/10.54097/hset.v17i.2622.

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Known as one of the most hopeful fields to find the new particle—Higgs bosons and become even more important after it is proved by Higgs. Higgs and his colleagues further improve their observation of the Higgs Bosons through the Higgs mechanism. This paper will show the basic properties of the Higgs bosons, and some machines of the Higgs bosons. The spontaneous symmetry breaking, and the Higgs mechanism have also been introduced due to their necessity for the Higgs boson. This paper will be an introduction for anyone who is interested in this field.

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2

QIN, XIN, and YAO-BEI LIU. "TRIPLE HIGGS BOSON PRODUCTION AT THE ILC IN THE LEFT–RIGHT TWIN HIGGS MODEL." International Journal of Modern Physics A 27, no. 06 (March 10, 2012): 1250030. http://dx.doi.org/10.1142/s0217751x12500303.

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Besides the SM-like Higgs boson h, the left–right twin Higgs (LRTH) model predicts the existence of three additional Higgs bosons: one neutral Higgs ϕ0and a pair of charged Higgs bosons ϕ±. In this paper, we focus on the study of the triple Higgs production at the ILC, i.e. e+e-→ϕ0ϕ+ϕ-and e+e-→hhϕ0. We present the production cross-sections and the distributions of the various observables, such as, the distributions of the energy and the transverse momenta of neutral and charged Higgs bosons, the differential cross-section of the invariant mass of final Higgs bosons pair, and the production angle distributions of neutral Higgs boson and charged Higgs boson. Our numerical results show that, for the processes e+e-→ϕ0ϕ+ϕ-and e+e-→hhϕ0, the production rates are at the level of 10-1fb with reasonable parameter values while the resonance production cross-section can be significantly enhanced and reach several tens fb. The signatures for signals and corresponding standard model backgrounds are also investigated for the decay mode [Formula: see text].

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3

Veatch, Jason. "Searches for Resonant Scalar Boson Pair Production Using Run 2 LHC Proton-Proton Collision Data." Symmetry 14, no. 2 (January 28, 2022): 260. http://dx.doi.org/10.3390/sym14020260.

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The discovery of the Higgs boson in 2012 provided confirmation of spontaneous electroweak symmetry breaking as the mechanism by which fundamental particles gain mass and thus completed the Standard Model of particle physics. Additionally, it opened a new approach to searching for potential new particles. Many beyond the Standard Model theories predict new heavy particles that couple to the Higgs boson, leading to a resonant production mode of Higgs boson pairs. Other theories extend the Higgs sector by introducing additional scalar bosons that differ from the observed Higgs boson only by mass. The ATLAS and CMS Collaborations have searched for evidence of such processes using s=13 TeV Run 2 proton-proton collision data at the Large Hadron Collider. This review article summarizes the latest experimental results from searches for resonant production of pairs of Higgs bosons or additional Higgs-like scalar bosons at ATLAS and CMS.

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4

Steggemann, Jan. "Extended Scalar Sectors." Annual Review of Nuclear and Particle Science 70, no. 1 (October 19, 2020): 197–223. http://dx.doi.org/10.1146/annurev-nucl-032620-043846.

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Extended scalar sectors appear in various extensions of the Standard Model of particle physics, such as supersymmetric models. They are also generic extensions of the Standard Model and can address a number of its shortcomings. Direct searches for additional Higgs bosons and measurements of the 125-GeV Higgs boson, both of which provide insights into the different possible sectors, are carried out at the LHC. This review gives an overview of searches for the additional Higgs bosons and their implications for different models. The discussed analyses comprise searches for neutral and charged Higgs bosons that decay in various final states. In addition, the review summarizes the constraints from precision measurements, including in particular the observed couplings of the 125-GeV Higgs boson. While several models naturally incorporate a Higgs boson with couplings that are similar to the ones in the Standard Model, the measurements of the 125-GeV Higgs boson provide constraints on all considered extensions.

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5

Junk, Thomas R., and Aurelio Juste. "Review of physics results from the Tevatron: Higgs boson physics." International Journal of Modern Physics A 30, no. 06 (February 27, 2015): 1541006. http://dx.doi.org/10.1142/s0217751x15410067.

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We review the techniques and results of the searches for the Higgs boson performed by the two Tevatron collaborations, CDF and DØ. The Higgs boson predicted by the Standard Model was sought in the mass range 90 GeV < mH < 200 GeV in all main production modes at the Tevatron: gluon–gluon fusion, WH and ZH associated production, vector boson fusion, and [Formula: see text] production, and in five main decay modes: [Formula: see text], H→τ+τ-, H→WW(*), H→ZZ(*) and H→γγ. An excess of events was seen in the [Formula: see text] searches consistent with a Standard Model Higgs boson with a mass in the range 115 GeV < mH < 135 GeV . Assuming a Higgs boson mass of mH = 125 GeV , studies of Higgs boson properties were performed, including measurements of the product of the cross section times the branching ratio in various production and decay modes, constraints on Higgs boson couplings to fermions and vector bosons, and tests of spin and parity. We also summarize the results of searches for supersymmetric Higgs bosons, and Higgs bosons in other extensions of the Standard Model.

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6

LAVOURA, L. "MAXIMAL CP VIOLATION VIA HIGGS-BOSON EXCHANGE." International Journal of Modern Physics A 08, no. 02 (January 20, 1993): 375–89. http://dx.doi.org/10.1142/s0217751x93000151.

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The unitarity of the mixing matrix of the charged Higgs bosons, and the orthogonality of the mixing matrix of the neutral Higgs bosons, are used to derive upper bounds on the values of general CP-violating expressions. The bounds are independent of the total number of Higgs fields in any specific model. They allow us to relax the usual assumption of only one Higgs boson being light. It is natural that the CP violation in the exchange of neutral Higgs bosons between bottom quarks be particularly large.

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7

DREES, MANUEL. "SUPERSYMMETRIC MODELS WITH EXTENDED HIGGS SECTOR." International Journal of Modern Physics A 04, no. 14 (August 20, 1989): 3635–51. http://dx.doi.org/10.1142/s0217751x89001448.

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The Higgs sector of supersymmetric models with an additional SU (2)× U (1)Y singlet or an additional pair of Higgs doublet superfields is investigated. It is shown that in the model with a Higgs singlet bounds on Higgs boson masses are considerably weaker than in the minimal supersymmetric model; in particular, all neutral scalars can be heavier than about 150 GeV or lighter than [Formula: see text], whereas the mass of the charged Higgs boson is essentially unconstrained. The four doublet model resembles the minimal model more closely; in particular, the bounds for the heaviest and lightest neutral scalar and the heaviest charged Higgs boson are unaltered. In this model, many relations between masses of different Higgs bosons can be found; 44 of the 66 possible decays of one Higgs boson into another Higgs boson plus a real W or Z boson are kinematically forbidden. It is also shown that in both models, the lightest neutral scalar becomes indistinguishable from the standard model Higgs boson if all other Higgs bosons of the model are much heavier than Mw.

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8

Asner, David. "Prospect for Discovering H0, A0 in Two-Photon Collisions at a Linear Collider." International Journal of Modern Physics A 18, no. 16 (June 30, 2003): 2893–902. http://dx.doi.org/10.1142/s0217751x03016355.

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We examine the potential for detecting and studying Higgs bosons in two-photon collisions at a future linear collider. Our study incorporates realistic two-photon spectra based on the most probable available laser technology. We study the cases of a) the heavy MSSM Higgs bosons and b) a Higgs boson with no WW/ZZ couplings from a general two Higgs doublet model.

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9

BÜSCHER, VOLKER, and KARL JAKOBS. "HIGGS BOSON SEARCHES AT HADRON COLLIDERS." International Journal of Modern Physics A 20, no. 12 (May 10, 2005): 2523–602. http://dx.doi.org/10.1142/s0217751x05022457.

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The investigation of the dynamics responsible for electroweak symmetry breaking is one of the prime tasks of experiments at present and future colliders. Experiments at the Tevatron [Formula: see text] Collider and at the CERN Large Hadron Collider (LHC) must be able to discover a Standard Model Higgs boson over the full mass range as well as Higgs bosons in extended models. In this review, the discovery potential for the Standard Model Higgs boson and for Higgs bosons in the Minimal Supersymmetric extension is summarized. Emphasis is put on those studies which have been performed recently within the experimental collaborations using a realistic simulation of the detector performance. This includes a discussion of the search for Higgs bosons using the vector boson fusion mode at the LHC, a discussion of the measurement of Higgs boson parameters as well as a detailed review of the MSSM sector for different benchmark scenarios. The Tevatron part of the review also contains a discussion of first physics results from data taken in the ongoing Run II.

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10

Dziewit, Bartosz, Magdalena Kordiaczyńska, and Tripurari Srivastava. "Production of the Doubly Charged Higgs Boson in Association with the SM Gauge Bosons and/or Other HTM Scalars at Hadron Colliders." Symmetry 13, no. 7 (July 10, 2021): 1240. http://dx.doi.org/10.3390/sym13071240.

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We investigate an extension of the Standard Model with one additional triplet of scalar bosons. Altogether, the model contains four Higgs bosons. We analyze the associated production of the doubly charged scalar with the Standard Model gauge bosons and the remaining Higgs bosons of the model, which are: the light (SM) and heavy neutral scalars and a singly charged scalar. We estimate, in the context of the present (HL–LHC) and future (FCC–hh) hadron colliders, the most promising processes in which a single produced doubly charged Higgs boson is involved.

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SOPCZAK, ANDRÉ. "HIGGS BOSON DISCOVERY POTENTIAL BEYOND THE MINIMAL STANDARD MODEL." International Journal of Modern Physics A 09, no. 11 (April 30, 1994): 1747–85. http://dx.doi.org/10.1142/s0217751x94000753.

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Detailed studies of neutral and charged Higgs boson pair production with full statistic detector simulations around [Formula: see text] with 500 pb−1 are presented in the context of a review of the Higgs boson discovery potential at LEP200. Already in the first phase of LEP200, a significant increase of the mass parameter space compared to LEP1 for the discovery of nonminimal Higgs bosons will be possible, while the mass range for the discovery of the minimal Standard Model Higgs boson will increase only marginally. The requirements for a decisive test of the Minimal Supersymmetric extension of the Standard Model (MSSM) at a later stage of LEP200 are discussed. A sensitivity mass range is given for charged Higgs bosons.

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Guchait, Monoranjan, and Jacky Kumar. "Light Higgs bosons in NMSSM at the LHC." International Journal of Modern Physics A 31, no. 12 (April 28, 2016): 1650069. http://dx.doi.org/10.1142/s0217751x1650069x.

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The next-to-minimal supersymmetric Standard Model (NMSSM) with an extended Higgs sector offers at least one Higgs boson as the Standard Model (SM)-like Higgs with a mass around 125 GeV. In this work, we revisit the mass spectrum and couplings of non-SM-like Higgs bosons taking into consideration most relevant constraints and identify the relevant parameter space. The discovery potential of these non-SM-like Higgs bosons, apart from their masses, is guided by their couplings with gauge bosons and fermions which are very much parameter space sensitive. We evaluate the rates of productions of these non-SM-like Higgs bosons at the LHC for a variety of decay channels in the allowed region of the parameter space. Although [Formula: see text], [Formula: see text] modes appear to be the most promising decay channels, but for a substantial region of parameter space the two-photon decay mode has a remarkably large rate. In this study we emphasize that this diphoton mode can be exploited to find the non-SM-like Higgs bosons of the NMSSM and can also be a potential avenue to distinguish the NMSSM from the MSSM. In addition, we discuss briefly the various detectable signals of these non-SM Higgs bosons at the LHC.

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13

FOOT, ROBERT, and ARCHIL KOBAKHIDZE. "ALTERNATIVE IMPLEMENTATION OF THE HIGGS BOSON." Modern Physics Letters A 26, no. 07 (March 7, 2011): 461–67. http://dx.doi.org/10.1142/s0217732311035043.

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We discuss an alternative implementation of the Higgs boson within the Standard Model which is possible if the renormalizability condition is relaxed. Namely, at energy scale Λ the Higgs boson interacts at tree-level only with matter fermions, while the full gauge invariance is still maintained. The interactions with the electroweak gauge bosons are induced at low energies through the radiative corrections. In this scenario the Higgs boson can be arbitrarily heavy, interacting with the Standard Model fields arbitrarily weakly. No violation of unitarity in the scattering of longitudinal electroweak bosons occurs, since they become unphysical degrees of freedom at energies Λ ~ TeV.

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14

KRIPFGANZ, J., and A. RINGWALD. "LEADING-ORDER FERMION-NUMBER NON-CONSERVATION IN THE (1+1)-DIMENSIONAL ABELIAN HIGGS MODEL." Modern Physics Letters A 05, no. 09 (April 10, 1990): 675–84. http://dx.doi.org/10.1142/s0217732390000767.

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We consider fermion-number violating Green’s functions involving also gauge and Higgs bosons in the axial (1+1)-dimensional Abelian Higgs model. We show that the Fourier transform of the classical vortex solution has (in the unitary gauge) an isolated pole at the position of the Higgs and gauge boson mass. In a certain sense the vortex, an Euclidean pseudoparticle, is capable to describe particles, i.e. physical gauge and Higgs bosons. From that it follows that, in the leading-order semiclassical approximation around the unit winding number vortex solution, the S-matrix elements for the fermion-number violating processes are local and of order [Formula: see text], where ν is the vacuum expectation value and n is the number of external boson legs. This suggests that, at high energy, fermion-number violating processes with associated production of many gauge and Higgs bosons have large probabilities reaching the unitarity limit, and puts the recent observation of a similar phenomenon in the standard electroweak theory on much firmer ground.

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15

Ramírez-Sánhez, F., A. Gutiérrez-Rodríguez, Alejandro González-Sánchez, and M. A. Hernández-Ruíz. "Z′ and Higgs Boson Production Associated with a Top Quark Pair as a Probe of the U(1)B-L Model at e+e- Colliders." Advances in High Energy Physics 2018 (July 3, 2018): 1–16. http://dx.doi.org/10.1155/2018/8523854.

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We study the production sensitivity of Higgs bosons h and H, in relation to the possible existence of Z′ boson and a top quark pair at the energy scales that will be reached in the near future at projected e+e- linear colliders. We focus on the resonance and no-resonance effects of the annihilation processes e+e-→(γ,Z,Z′)→tt-h and e+e-→(γ,Z,Z′)→tt-H. Furthermore, we develop and present novel analytical formulas to assess the total cross section involved in the production of Higgs bosons. We find that the possibility of performing precision measurements for the Higgs bosons h and H and for the Z′ boson is very promising at future e+e- linear colliders.

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16

Lu, Wei. "A Clifford algebra approach to chiral symmetry breaking and fermion mass hierarchies." International Journal of Modern Physics A 32, no. 26 (September 20, 2017): 1750159. http://dx.doi.org/10.1142/s0217751x17501597.

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We propose a Clifford algebra approach to chiral symmetry breaking and fermion mass hierarchies in the context of composite Higgs bosons. Standard model fermions are represented by algebraic spinors of six-dimensional binary Clifford algebra, while ternary Clifford algebra-related flavor projection operators control allowable flavor-mixing interactions. There are three composite electroweak Higgs bosons resulted from top quark, tau neutrino, and tau lepton condensations. Each of the three condensations gives rise to masses of four different fermions. The fermion mass hierarchies within these three groups are determined by four-fermion condensations, which break two global chiral symmetries. The four-fermion condensations induce axion-like pseudo-Nambu–Goldstone bosons and can be dark matter candidates. In addition to the 125 GeV Higgs boson observed at the Large Hadron Collider, we anticipate detection of tau neutrino composite Higgs boson via the charm quark decay channel.

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Mankel, R. "Higgs searches beyond the Standard Model." International Journal of Modern Physics: Conference Series 31 (January 2014): 1460288. http://dx.doi.org/10.1142/s2010194514602889.

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While the existence of a Higgs boson with a mass near 125 GeV has been clearly established, the detailed structure of the entire Higgs sector is yet unclear. Besides the Standard Model interpretation, various possibilities for extended Higgs sectors are being considered. The minimal supersymmetric extension (MSSM) features two Higgs doublets resulting in five physical Higgs bosons, which are subject to direct searches. Alternatively, more generic Two-Higgs Doublet models (2HDM) are used for the interpretation of results. The Next-to-Minimal Supersymmetric Model (NMSSM) has a more complex Higgs sector with seven physical states. Also exotic Higgs bosons decaying to invisible final states are considered. This article summarizes recent findings based on results from collider experiments.

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Mankel, R. "Higgs searches beyond the Standard Model." International Journal of Modern Physics A 29, no. 24 (September 29, 2014): 1430057. http://dx.doi.org/10.1142/s0217751x14300579.

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While the existence of a Higgs boson with a mass near 125 GeV has been clearly established, the detailed structure of the entire Higgs sector is yet unclear. Besides the Standard Model interpretation, various possibilities for extended Higgs sectors are being considered. The minimal supersymmetric extension (MSSM) features two Higgs doublets resulting in five physical Higgs bosons, which are subject to direct searches. Alternatively, more generic Two-Higgs Doublet models (2HDM) are used for the interpretation of results. The Next-to-Minimal Supersymmetric Model (NMSSM) has a more complex Higgs sector with seven physical states. Also exotic Higgs bosons decaying to invisible final states are considered. This article summarizes recent findings based on results from collider experiments.

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Heng, Zhaoxia, Lin Guo, Pengqiang Sun, and Wei Wei. "Charged Higgs bosons in the NMSSM under current LHC constraints." Modern Physics Letters A 34, no. 28 (September 13, 2019): 1950230. http://dx.doi.org/10.1142/s0217732319502304.

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Charged Higgs boson is a crucial prediction of new physics beyond the SM. In this work, we perform a comprehensive scan over the parameter space of NMSSM considering various experimental constraints including the direct search limits from the 13 TeV LHC, and consider the scenario that the next-to-lightest CP-even Higgs boson is SM-like. We find that the masses of charged Higgs bosons can be as light as 350 GeV, the lightest CP-even Higgs boson [Formula: see text] is predominantly singlet and can be as light as 48 GeV, and the lightest CP-odd Higgs boson [Formula: see text] is also singlet-dominated and can be as light as 82 GeV. The charged Higgs bosons mainly decay to [Formula: see text] or [Formula: see text], but the branching ratio of the exotic decays [Formula: see text] and [Formula: see text] can maximally reach 20% and 11%, respectively, which can be used to distinguish the NMSSM from MSSM. Such a heavy charged Higgs boson is inaccessible at the 13 TeV LHC with a luminosity of 36.1 fb[Formula: see text] and its detection needs higher energy and/or higher luminosity.

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TEYSSIER, DANIEL. "A flavour-independent search for a hadronically decaying neutral Higgs bosons at LEP with the L3 detector." International Journal of Modern Physics A 16, supp01b (September 2001): 819–21. http://dx.doi.org/10.1142/s0217751x01008199.

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General two Higgs doublet models allow for five scalar bosons, three of which being neutral. No signal is found in the data collected by the L3 detector in e+e- collisions at 189 – 202 GeV center-of-mass energies. Limits are set on the couplings of the h and A Higgs bosons to the Z boson.

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YAMAMOTO, KAZUHIRO. "HIGGS SEARCHES AT THE TEVATRON." International Journal of Modern Physics A 25, no. 27n28 (November 10, 2010): 5097–104. http://dx.doi.org/10.1142/s0217751x10050883.

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We present the latest results on searches for the standard and beyond-the-standard model Higgs bosons in proton-antiproton collisions at [Formula: see text] by the CDF and DØ experiments at the Fermilab Tevatron. No significant excess is observed above the expected background, and the cross section limits for the Higgs bosons are calculated. It is noticed that the standard model Higgs boson in the mass range 163 – 166 GeV/c2 is excluded at the 95% C.L.

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Baer, Howard, Vernon Barger, Xerxes Tata, and Kairui Zhang. "Prospects for Charged Higgs Bosons in Natural SUSY Models at the High-Luminosity LHC." Symmetry 15, no. 8 (July 25, 2023): 1475. http://dx.doi.org/10.3390/sym15081475.

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We continue our examination of prospects for the discovery of heavy Higgs bosons of natural SUSY (natSUSY) models at the high luminosity LHC (HL-LHC), this time focusing on charged Higgs bosons. In natSUSY, higgsinos are expected at the few hundred GeV scale whilst electroweak gauginos inhabit the TeV scale and the heavy Higgs bosons, H, A and H± could range up tens of TeV without jeopardizing naturalness. For TeV-scale heavy SUSY Higgs bosons H, A and H±, as currently required by LHC searches, SUSY decays into gaugino plus higgsino can dominate H± decays provided these decays are kinematically accessible. The visible decay products of higgsinos are soft making them largely invisible, whilst the gauginos decay to W, Z or h plus missing transverse energy (ET). Charged Higgs bosons are dominantly produced at LHC14 via the parton subprocess, gb→H±t. In this paper, we examine the viability of observing signatures from H±→τν, H±→tb and H±→W,Z,h+ET events produced in association with a top quark at the HL-LHC over large Standard Model (SM) backgrounds from (mainly) tt¯, tt¯V and tt¯h production (where V=W,Z). We find that the greatest reach is found via the SM H±(→τν)+t channel with a subdominant contribution from the H±(→tb)+t channel. Unlike for neutral Higgs searches, the SUSY decay modes appear to be unimportant for H± searches at the HL-LHC. We delineate regions of the mA vs. tanβ plane, mostly around mA∼ 1–2 TeV, where signals from charged Higgs bosons would serve to confirm signals of a heavy, neutral Higgs boson at the 5σ level or, alternatively, to exclude heavy Higgs bosons at the 95% confidence level at the high luminosity LHC.

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DAWSON, SALLY, and HOWARD E. HABER. "HIGGS BOSON LOW-ENERGY THEOREMS AND THEIR APPLICATIONS." International Journal of Modern Physics A 07, no. 01 (January 10, 1992): 107–20. http://dx.doi.org/10.1142/s0217751x92000065.

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We examine the Higgs boson low-energy theorems and their applications in the study of light Higgs boson interactions with mesons and baryons. In particular, we clarify how a new parameter (the A parameter) emerges when the chiral Lagrangian method is combined with the Higgs low-energy theorems to obtain predictions for the interaction of Higgs bosons and pseudoscalar mesons. The computation of the Higgs–nucleon coupling and the branching ratios for light Higgs boson production in the decays K → πH and η′ → ηH are illustrated.

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Cao, Jun, and Jie-Fen Shen. "Pair production of doubly charged Higgs boson at photon linear collider in the Higgs triplet model." Modern Physics Letters A 29, no. 10 (March 28, 2014): 1450041. http://dx.doi.org/10.1142/s0217732314500412.

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The characteristic feature of the Higgs Triplet Model (HTM) is the existence of the doubly charged Higgs bosons H±±. In this paper, we study the pair production of doubly charged Higgs bosons in γγ collisions at the International Linear Collider (ILC). We present the production cross-sections and the distributions of the various observables, i.e. the distributions of the transverse momenta, the rapidity distributions for doubly charged Higgs bosons and the production angle distributions of the charged Higgs boson pair. Our numerical results show that, the values of the unpolarized cross-sections can reach a few hundreds of fb. We also study the possible final state for the decay mode H±±→W±W± and relevant Standard Model (SM) background. Due to high produced rate and small SM background, the possible signals of H±± might be detected via this process in the future ILC experiments.

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FÉLIX-BELTRÁN, OLGA. "HIGGS MASSES AND COUPLING WITHIN AN EXTENSION OF THE MSSM WITH HIGGS TRIPLETS." International Journal of Modern Physics A 17, no. 04 (February 10, 2002): 465–86. http://dx.doi.org/10.1142/s0217751x02005955.

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We study the properties of the Higgs sector in an extended SUSY model that includes a complex (Y=0) Higgs triplet. In particular, we evaluate the Higgs masses and their couplings to gauge bosons, including the leading radiative corrections using the one-loop effective potential. The mass difference between the CP-even and CP-odd neutral scalars, which can mimic a CP-violating Higgs signature of the MSSM, is also studied. Then, we study the range of parameters that are bounded from the LEP2 search for neutral Higgs bosons, as well as the corresponding region where at least one of the neutral CP-even Higgs boson can be detected at a future e+e- collider with a c.m. energy of 500 GeV.

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Paraskevopoulos, Christos. "Measurement of the Higgs quartic coupling c ₂ v from di-Higgs Vector Boson Fusion in the bb¯τ+τ− channel." Journal of Physics: Conference Series 2375, no. 1 (November 1, 2022): 012009. http://dx.doi.org/10.1088/1742-6596/2375/1/012009.

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Abstract The Brout Englert Higgs (BEH) mechanism of electroweak symmetry breaking and mass generation was experimentally confirmed after the discovery of the Higgs boson at the Large Hadron Collider in 2012. The BEH mechanism not only predicts the existence of a massive scalar particle, but also requires this scalar particle to couple to itself. Double Higgs production provides a unique handle, since it allows the extraction of the trilinear Higgs self-coupling. VBF di-Higgs production also probes the quartic Higgs bosons to vector bosons coupling (c 2 v). In this topic the effort on setting constraints on c 2 v will be discussed. Event selection and reconstruction will be illustrated as well as a Neural Network designed to identify VBF events.

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Brost, Elizabeth, and Luca Cadamuro. "Searching for Pairs of Higgs Bosons in the LHC Run 2 Dataset." Symmetry 14, no. 7 (July 18, 2022): 1467. http://dx.doi.org/10.3390/sym14071467.

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The discovery of the Higgs boson confirms the existence of a scalar sector of the standard model, responsible for electroweak symmetry breaking, but the nature and properties of the potential at the origin of this mechanism are still unknown. By studying the production of pairs of Higgs bosons (HH), physicists can directly measure the coupling of the Higgs boson to itself and thus determine the shape of this potential, which has far-reaching implications on the origin and evolution of our Universe. Because of this deep connection to the foundations of electroweak symmetry breaking, HH production is also an ideal place to search for manifestations of yet-unknown physics, such as modifications of the strength of the self-coupling and of the interaction between pairs of vector bosons and Higgs bosons. In this review article, we summarize the current searches for HH production at ATLAS and CMS, using the LHC Run 2 dataset, discuss the implications of our current constraints on physics beyond the standard model, and briefly review prospect for future HH searches.

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Barger, V., and K. Whisnant. "HEAVY Z BOSON DECAYS TO W, Z AND HIGGS BOSONS IN E6 SUPERSTRING MODELS." International Journal of Modern Physics A 02, no. 04 (August 1987): 1171–79. http://dx.doi.org/10.1142/s0217751x87000557.

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We report on the decays of a heavy neutral gauge boson Z2 into W+W−, the Z and a Higgs boson, or two Higgs bosons in superstring-inspired electroweak models with an extra U(1) gauge group, two Higgs doublets and a Higgs singlet. The branching ratios for these processes are generally similar and two boson decay modes of Z2 must exist at the few percent level if kinematically accessible, although the bosonic modes which dominate in any given scenario depend on the U(1) quantum numbers and mixing in the Higgs sector.

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JAKOBS, KARL, and MARKUS SCHUMACHER. "PROSPECTS FOR HIGGS BOSON SEARCHES AT THE LHC." International Journal of Modern Physics A 23, no. 32 (December 30, 2008): 5093–115. http://dx.doi.org/10.1142/s0217751x08042808.

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The investigation of the dynamics responsible for electroweak symmetry breaking is one of the prime tasks of experiments at the CERN Large Hadron Collider (LHC). The experiments ATLAS and CMS have been designed to be able to discover a Standard Model Higgs boson over the full mass range as well as Higgs bosons in extended models. In this paper, the prospects for Higgs boson searches at the LHC are reviewed. In addition, the potential for the measurement of Higgs boson parameters is discussed.

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HOSOTANI, YUTAKA. "GAUGE-HIGGS UNIFICATION: STABLE HIGGS BOSONS AS COLD DARK MATTER." International Journal of Modern Physics A 25, no. 27n28 (November 10, 2010): 5068–81. http://dx.doi.org/10.1142/s0217751x1005086x.

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In the gauge-Higgs unification the 4D Higgs field becomes a part of the extra-dimensional component of the gauge potentials. In the SO(5) × U(1) gauge-Higgs unification in the Randall-Sundrum warped spacetime the electroweak symmetry is dynamically broken through the Hosotani mechanism. The Higgs bosons become absolutely stable, and become the dark matter of the universe. The mass of the Higgs boson is determined from the WMAP data to be about 70 GeV.

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Arhrib, Abdesslam, Rachid Benbrik, Mohamed Krab, Bouzid Manaut, Stefano Moretti, Yan Wang, and Qi-Shu Yan. "New Light H± Discovery Channels at the LHC." Symmetry 13, no. 12 (December 4, 2021): 2319. http://dx.doi.org/10.3390/sym13122319.

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A light charged Higgs boson has been searched for at the Large Hadron Collider (LHC) via top (anti)quark decay, i.e., t→bH+, if kinematically allowed. In this contribution, we propose new channels for light charged Higgs boson searches via the pair productions pp→H±h/A and pp→H+H− at the LHC in the context of the Two-Higgs Doublet Model (2HDM) Type-I. By focusing on a case where the heavy H state is the Standard Model (SM)-like one already observed, we investigate the production of the aforementioned charged Higgs bosons and their bosonic decay channels, namely, H±→W±h and/or H±→W±A. We demonstrate that such production and decay channels can yield substantial alternative discovery channels for H± bosons at the LHC. Finally, we propose eight benchmark points (BPs) to motivate the search for such signatures.

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MÉNDEZ, A. "HIGGS BOSONS." Modern Physics Letters A 05, no. 26 (October 20, 1990): 2087–100. http://dx.doi.org/10.1142/s0217732390002389.

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The main phenomenological aspects of the Higgs bosons are briefly reviewed in the context of the Standard Model and in models with an "extended" Higgs sector. Among the latter, special emphasis is made on the Two-Doublet Model and, particularly, the Minimal Supersymmetric Model.

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Kakizaki, Mitsuru, Shinya Kanemura, Mariko Kikuchi, Toshinori Matsui, and Hiroshi Yokoya. "Indirect reach of heavy MSSM Higgs bosons by precision measurements at future lepton colliders." International Journal of Modern Physics A 30, no. 33 (November 26, 2015): 1550192. http://dx.doi.org/10.1142/s0217751x15501924.

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In the Minimal Supersymmetric Standard Model (MSSM), the bottom Yukawa coupling of the Higgs boson can considerably deviate from its Standard Model prediction due to nondecoupling effects. We point out that the ratio of the Higgs boson decay branching fraction to a bottom quark pair and that to a W-boson pair from the same production channel is particularly sensitive to large additional MSSM Higgs boson mass regions at future electron–positron colliders. Based on this precision measurement, we explicitly show the indirect discovery reach of the additional Higgs bosons according to planned programs of the International Linear Collider.

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Dong, P. V., and H. N. Long. "The EconomicalSU(3)C⊗SU(3)L⊗U(1)XModel." Advances in High Energy Physics 2008 (2008): 1–74. http://dx.doi.org/10.1155/2008/739492.

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TheSU(3)C⊗SU(3)L⊗U(1)Xgauge model with minimal scalar sector, two Higgs triplets, is presented in detail. One of the vacuum expectation valuesuis a source of lepton-number violations and a reason for mixing among charged gauge bosons—the standard modelW±and the bilepton gauge bosonsY±, as well as among the neutral non-Hermitian bileptonX0and neutral gauge bosons—theZand the newZ′. An exact diagonalization of the neutral gauge boson sector is derived, and bilepton mass splitting is also given. Because of these mixings, the lepton-number violating interactions exist in both charged and neutral gauge boson sectors. Constraints on vacuum expectation values of the model are estimated andu≃𝒪(1)GeV,v≃vweak=246GeV, andω≃𝒪(1)TeV. In this model, there are three physical scalars, two neutral and one charged, and eight Goldstone bosons—the needed number for massive gauge bosons. The minimal scalar sector can provide all fermions including quarks and neutrinos consistent masses in which some of them require one-loop radiative corrections.

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35

Waiwattana, Jinna, Chayanit Asawatangtrakuldee, Pakorn Saksirimontri, Vichayanun Wachirapusitanand, and Natha Pitakkultorn. "Application of Machine Learning Algorithms for Searching BSM Higgs Bosons Decaying to a Pair of Bottom Quarks." Trends in Sciences 19, no. 19 (October 4, 2022): 5373. http://dx.doi.org/10.48048/tis.2022.5373.

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Although the discovery of the 125 GeV Higgs boson confirms the Higgs mechanism of the Standard Model (SM), many theories beyond the SM have been introduced to address several phenomena yet to be explained by the SM. For instance, the 2-Higgs Doublet Models is the simplest extension of the SM Higgs sector and predicting the existence of additional Higgs bosons at different states. The aim of this study is to search for machine learning (ML) algorithms which have been widely used in High Energy Physics. This will improve the sensitivity of the search for BSM Higgs bosons produced in association with a bottom quark () that then decays into a pair of bottom quarks (); the predominant decay channel of the Higgs boson, though, buried by a large multi-jet background process. In this study, we train 2 different ML algorithms: Tree-based models and Neural Networks, to classify signal and background events collected by the Compact Muon Solenoid detector from proton-proton collisions at 13 TeV. The evaluation metrics are calculated to provide classification efficiencies from different models. The results show that the classification of signal and background processes can be improved using ML techniques. Neural Networks reported the highest AUC score of 0.951 which is comparable with Adaptive Boosting model, while Decision Trees (DTs) and Random Forest models slightly underperformed by 2 - 3 %. We therefore can make use of the trained models as signal vs background classifiers to perform further statistical analysis searches for BSM Higgs bosons. GRAPHICAL ABSTRACT

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36

Obikhod, T. V., and I. A. Petrenko. "Mass Reconstruction of MSSM Higgs Boson." Ukrainian Journal of Physics 64, no. 8 (September 18, 2019): 714. http://dx.doi.org/10.15407/ujpe64.8.714.

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The problems of the Standard Model, as well as questions related to Higgs boson properties led to the need to model the ttH associated production and the Higgs boson decay to a top quark pair within the MSSM model. With the help of computer programs MadGraph, Pythia, and Delphes and using the latest kinematic cuts taken from experimental data obtained at the LHC, we have predicted the masses of MSSM Higgs bosons, A and H.

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CALMET, XAVIER. "ASYMPTOTICALLY SAFE WEAK INTERACTIONS." Modern Physics Letters A 26, no. 21 (July 10, 2011): 1571–76. http://dx.doi.org/10.1142/s0217732311035900.

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We emphasize that the electroweak interactions without a Higgs boson are very similar to quantum general relativity. The Higgs field could just be a dressing field and might not exist as a propagating particle. In that interpretation, the electroweak interactions without a Higgs boson could be renormalizable at the nonperturbative level because of a nontrivial fixed point. Tree-level unitarity in electroweak bosons scattering is restored by the running of the weak scale.

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KINNUNEN, RITVA. "SUSY HIGGS SEARCHES AT THE LHC." International Journal of Modern Physics A 22, no. 31 (December 20, 2007): 5935–42. http://dx.doi.org/10.1142/s0217751x07039134.

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Searches for the Higgs bosons of the Minimal Supersymmetric Standard Model are discussed at the LHC in the CMS and ATLAS experiments. Results are presented for the scenario which maximizes the mass of the lighter scalar Higgs boson. Low integrated luminosity is assumed.

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CALMET, XAVIER. "AN ALTERNATIVE VIEW ON THE ELECTROWEAK INTERACTIONS." International Journal of Modern Physics A 26, no. 17 (July 10, 2011): 2855–64. http://dx.doi.org/10.1142/s0217751x11053699.

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We discuss an alternative to the Higgs mechanism which leads to gauge invariant masses for the electroweak bosons. The key idea is to reformulate the gauge invariance principle which, instead of being applied as usual at the level of the action, is applied at the level of the quantum fields. In other words, we define gauge invariant quantum fields which are used to build the action. In that framework, the Higgs field is not necessarily a physical degree of freedom but can merely be a dressing field that does not propagate. If the Higgs boson is not propagating, the weak interactions must become strongly coupled below 1 TeV and have a nontrivial fixed point and would thus be renormalizable at the nonperturbative level. On the other hand, if a gauge invariant Higgs boson is introduced in the model, its couplings to the fermions and the electroweak bosons can be quite different from those expected in the Standard Model.

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GONZALEZ-GARCIA, M. C. "ANOMALOUS HIGGS COUPLINGS." International Journal of Modern Physics A 14, no. 20 (August 10, 1999): 3121–56. http://dx.doi.org/10.1142/s0217751x99001494.

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We review the effects of new effective interactions on Higgs-boson phenomenology. New physics in the electroweak bosonic sector is expected to induce additional interactions between the Higgs doublet field and the electroweak gauge bosons, leading to anomalous Higgs couplings as well as anomalous gauge-boson self-interactions. Using a linearly realized SU (2)L× U (1)Y invariant effective Lagrangian to describe the bosonic sector of the Standard Model, we review the effects of the new effective interactions on the Higgs-boson production rates and decay modes. We summarize the results from searches for the new Higgs signatures induced by the anomalous interactions in order to constrain the scale of new physics, in particular at CERN LEP and Fermilab Tevatron colliders.

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GUNION, JOHN F. "PROBING EXOTIC HIGGS SECTORS IN ℓ-ℓ- COLLISIONS." International Journal of Modern Physics A 13, no. 14 (June 10, 1998): 2277–97. http://dx.doi.org/10.1142/s0217751x98001074.

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I review extended Higgs sectors and constraints thereon arising from ρ=1, gauge-coupling unification and b→sγ. The couplings and decays of the Higgs boson eigen-states are outlined for triplet representations. Direct experimental probes of exotic Higgs bosons are reviewed with a focus on the important role that would be played by an e-e- or μ-μ- collider.

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Bengtsson, Hans-Uno, Hiroaki Yamamoto, and Sachio Komamiya. "SEARCH FOR CHARGED HIGGS BOSONS AT SSC." International Journal of Modern Physics A 02, no. 04 (August 1987): 1055–67. http://dx.doi.org/10.1142/s0217751x87000454.

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We examine the possibility of finding charged Higgs bosons (H±) at the SSC. The charged Higgs boson is produced with a top quark via a gluon+bottom quark interaction (g+b→H+t). For the two Higgs doublet models, H± decays predominantly into t+b. Since the background from QCD processes will be very severe for this decay mode, we studied the H±→τ+ν decay mode. Even for this mode, background from the processes pp→W+t+spectators→ℓ+νℓ+t+spectators will be very high. In the two Higgs doublet models, it is very difficult to extract the charged Higgs signal for reasonable values of the ratio of the two vacuum expectation values ( tan β=v1/v2).

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43

Arhrib, Abdesslam, Adil Jueid, and Stefano Moretti. "Searching for heavy charged Higgs bosons through top quark polarization." International Journal of Modern Physics A 35, no. 15n16 (June 4, 2020): 2041011. http://dx.doi.org/10.1142/s0217751x20410110.

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We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in [Formula: see text] within a 2-Higgs Doublet Model (2HDM). The chiral structure of the [Formula: see text] coupling can trigger a particular spin state of the top quark produced in the decay of a charged Higgs boson and, therefore, is sensitive to the underlying mechanism of the Electroweak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions and forward–backward asymmetries of the top quark’s decay products can be used to search for heavy charged Higgs bosons and also as model discriminators.

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44

Gurskaya, A. V., and M. V. Dolgopolov. "SCENARIO STUDY OF HIGGS BOSON IN THE FRAMEWORK NMSSM." Vestnik of Samara University. Natural Science Series 20, no. 7 (May 30, 2017): 125–33. http://dx.doi.org/10.18287/2541-7525-2014-20-7-125-133.

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The questions of implementation in the theory of few Higgs bosons is consid- ered in this article. The corresponding hypothesis, which are the consequences of interpretation of results of LHC-experiments are experienced. Arguments in fa- vor of supersymmetric models are presented. Within the frameworks of NMSSM, estimates for the areas of variation of free parameters of the model are made, masses of Higgs bosons and neutralino, which is a candidate for dark matter particles are calculated. The values of these physical quantities collected in a speciﬁc set can be combined in the so-called scenario study of Higgs boson. Four scenarios in which there is an explanation of existing hypotheses are revealed.

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45

Biekötter, T., M. Chakraborti, and S. Heinemeyer. "The “96 GeV excess” at the LHC." International Journal of Modern Physics A 36, no. 22 (July 30, 2021): 2142018. http://dx.doi.org/10.1142/s0217751x21420185.

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The CMS collaboration reported an intriguing [Formula: see text] (local) excess at 96 GeV in the light Higgs-boson search in the diphoton decay mode. This mass coincides with a [Formula: see text] (local) excess in the [Formula: see text] final state at LEP. We briefly review the proposed combined interpretations for the two excesses. In more detail, we review the interpretation of this possible signal as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We show which channels have the best prospects for the discovery of additional Higgs bosons at the upcoming Run 3 of the LHC.

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LONG, HOANG NGOC. "SCALAR SECTOR OF THE 3 3 1 MODEL WITH THREE HIGGS TRIPLETS." Modern Physics Letters A 13, no. 23 (July 30, 1998): 1865–73. http://dx.doi.org/10.1142/s0217732398001959.

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A scalar sector of the 3 3 1 model with three Higgs triplets is considered in detail. The mass spectrum, eigenstates and interactions of the Higgs and the SM gauge bosons are derived. We show that one of the neutral scalars can be identified with the standard model Higgs boson, and in the considered potential, there is no mixing between scalars having vev and those without vev.

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KRASNIKOV, N. V. "THE SEARCH FOR NONSTANDARD HIGGS BOSONS WITH BIG YUKAWA COUPLING CONSTANTS AT FNAL AND LHC." Modern Physics Letters A 10, no. 35 (November 20, 1995): 2675–85. http://dx.doi.org/10.1142/s0217732395002805.

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We discuss the phenomenology of many Higgs doublet model—the model where each Higgs doublet couples with its own quark and lepton with relatively big Yukawa coupling constants. Namely, we investigate the discovery potential of the Higgs bosons at LHC and find lower mass limits on nonstandard Higgs bosons from FNAL data. We find that it is possible to discover such Higgs bosons at LHC with the masses up to 5 TeV.

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48

YAMADA, ATSUSHI. "PROBING THE HIGGS SECTOR OF THE MINIMAL SUPERSYMMETRIC STANDARD MODEL AT e+e− COLLIDERS." Modern Physics Letters A 07, no. 31 (October 10, 1992): 2877–88. http://dx.doi.org/10.1142/s021773239200224x.

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The ability of future e+e− colliders to study the supersymmetric Higgs sector is examined. The effects of the radiative corrections are included. A global analysis is given for the production cross-sections of the neutral Higgs bosons over the full parameter space of the Higgs sector, which clarifies the integrated luminosity necessary for the detection of the neutral Higgs bosons. The branching ratios of the three neutral Higgs bosons are also computed.

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Khosa, Charanjit K., and P. N. Pandita. "Measuring the trilinear neutral Higgs boson couplings in the minimal supersymmetric standard model at e+e− colliders in the light of the discovery of a Higgs boson." International Journal of Modern Physics A 31, no. 18 (June 29, 2016): 1650108. http://dx.doi.org/10.1142/s0217751x16501086.

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We consider the measurement of the trilinear couplings of the neutral Higgs bosons in the minimal supersymmetric standard model (MSSM) at a high energy [Formula: see text] linear collider in the light of the discovery of a Higgs boson at the CERN Large Hadron Collider (LHC). We identify the state observed at the LHC with the lightest Higgs boson [Formula: see text] of the MSSM, and impose the constraints following from this identification, as well as other experimental constraints on the MSSM parameter space. In order to measure trilinear neutral Higgs couplings, we consider different processes where the heavier Higgs boson [Formula: see text] of the MSSM is produced in electron–positron collisions, which subsequently decays into a pair of lighter Higgs boson. We identify the regions of the MSSM parameter space where it may be possible to measure the trilinear couplings of the Higgs boson at a future electron–positron collider. A measurement of the trilinear Higgs couplings is a crucial step in the construction of the Higgs potential, and hence in establishing the phenomena of spontaneous symmetry breaking in gauge theories.

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Fariborz, Amir H., Renata Jora, and Joseph Schechter. "A semiclassical approach for the Higgs boson." International Journal of Modern Physics A 29, no. 32 (December 30, 2014): 1450196. http://dx.doi.org/10.1142/s0217751x14501966.

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Starting from the equations of motion of the fields in a theory with spontaneous symmetry breaking and by making some simple assumptions regarding their behavior we derive simple tree level relations between the mass of the Higgs boson in the theory and the masses of the gauge bosons corresponding to the broken generators. We show that these mass relations have a clear meaning if both the scalars and the gauge bosons in the theory are composite states made of two fermions.

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