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Journal articles on the topic 'Astroparticle Physics - Standard Model (SM)'

Author: Grafiati
Published: 7 September 2023
Last updated: 31 July 2025

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1

Feng, Jonathan L., Felix Kling, Mary Hall Reno, et al. "The Forward Physics Facility at the High-Luminosity LHC." Journal of Physics G: Nuclear and Particle Physics 50, no. 3 (2023): 030501. http://dx.doi.org/10.1088/1361-6471/ac865e.

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Abstract High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe standard model (SM) processes and search for physics beyond the standard model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physic
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BETTINI, A. "ASTROPARTICLE PHYSICS." International Journal of Modern Physics A 22, no. 30 (2007): 5550–60. http://dx.doi.org/10.1142/s0217751x07038815.

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Astroparticle is a very wide, expanding, sector of Physics; this report covers only a fraction of it complementing the plenary reports of Y. Takahashi and K. Inoue. I will focus, in particular, on the experimental evidence of new physics, beyond the Standard Model. Astroparticle and accelerator experiments will give complementary tools in the search of new particles, like those of the dark matter, and new fundamental fields, like the inflaton.
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Tran, Van Que, Thong T. Q. Nguyen, and Tzu-Chiang Yuan. "Self-interacting vectorial dark matter in a SM-like dark sector." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 015. http://dx.doi.org/10.1088/1475-7516/2024/05/015.

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Abstract A dark SU(2) D × U(1) D gauge-Higgs sector, an exact copy of the Standard Model (SM) one, is proposed. It is demonstrated that the dark gauge bosons 𝒲(p,m), in analogous to the SM W ±, can fulfill the role as a self-interacting vector dark matter candidate, solving the core versus cusp and missing satellites problems faced by the conventional paradigm of collisionless weakly interacting massive particle. Constraints from collider, astroparticle and cosmology on such a self-interacting vector dark matter candidate are scrutinized. Implications for the future searches of 𝒲(p,m) in direc
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Tinyakov, Peter, Maxim Pshirkov, and Sergei Popov. "Astroparticle Physics with Compact Objects." Universe 7, no. 11 (2021): 401. http://dx.doi.org/10.3390/universe7110401.

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Probing the existence of hypothetical particles beyond the Standard model often deals with extreme parameters: large energies, tiny cross-sections, large time scales, etc. Sometimes, laboratory experiments can test required regions of parameter space, but more often natural limitations lead to poorly restrictive upper limits. In such cases, astrophysical studies can help to expand the range of values significantly. Among astronomical sources, used in interests of fundamental physics, compact objects—neutron stars and white dwarfs—play a leading role. We review several aspects of astroparticle
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GREEN, DAN. ""REDISCOVERING" THE STANDARD MODEL AT CMS." Modern Physics Letters A 26, no. 05 (2011): 309–17. http://dx.doi.org/10.1142/s0217732311035134.

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The Large Hadron Collider (LHC) began 7 TeV C.M. energy operation in April, 2010. The CMS experiment immediately analyzed the earliest data taken in order to "rediscover" the Standard Model (SM) of high energy physics. By the late summer, all SM particles were observed and CMS began to search for physics beyond the SM and beyond the present limits set at the Fermilab Tevatron. The first LHC run ended in Dec., 2010 with a total integrated luminosity of about 45 pb-1 delivered to the experiments.
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Wolf, Günter. "Highlights in Subnuclear Physics." International Journal of Modern Physics A 18, supp01 (2003): 129–77. http://dx.doi.org/10.1142/s0217751x03016641.

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An overview on new developments in experimental particle and astroparticle physics is presented. This includes observation of CP violation in the B-sector, detection of direct CP violation in the K0-system, new measurements on solar neutrinos, cosmic microwave background radiation and properties of the universe, electroweak results from the large colliders and tests of the Standard Model, measurement of the anomalous magnetic moment of muons, structure of the proton at large energy transfers and virtualities, and heavy ion collisions at very high energies. Finally, the physics reach of TEVATRO
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7

Kitahara, Teppei. "Standard Model and New physics for ε′k/εk". EPJ Web of Conferences 179 (2018): 01007. http://dx.doi.org/10.1051/epjconf/201817901007.

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The first result of the lattice simulation and improved perturbative calculations have pointed to a discrepancy between data on ε′k/εk and the standard-model (SM) prediction. Several new physics (NP) models can explain this discrepancy, and such NP models are likely to predict deviations of ℬ(K → πvv) from the SM predictions, which can be probed precisely in the near future by NA62 and KOTO experiments. We present correlations between ε′k/εk and ℬ(K → πvv) in two types of NP scenarios: a box dominated scenario and a Z-penguin dominated one. It is shown that different correlations are predicted
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8

Okada, Nobuchika, Digesh Raut, and Desmond Villalba. "Domain-Wall Standard Model in non-compact 5D and LHC phenomenology." Modern Physics Letters A 34, no. 10 (2019): 1950080. http://dx.doi.org/10.1142/s0217732319500809.

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We propose a framework to construct “Domain-Wall Standard Model” in a non-compact 5-dimensional spacetime, where all the Standard Model (SM) fields are localized in certain domains of the 5th dimension and the SM is realized as a 4-dimensional effective theory without any compactification for the 5th dimension. In this context, we investigate the collider phenomenology of the Kaluza–Klein (KK) modes of the SM gauge bosons and the current constraints from the search for a new gauge boson resonance at the Large Hadron Collider Run-2. The couplings of the SM fermions with the KK-mode gauge bosons
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9

Díaz Cruz, L. "The Higgs profile in the standard model and beyond." Revista Mexicana de Física 65, no. 5 Sept-Oct (2019): 419. http://dx.doi.org/10.31349/revmexfis.65.419.

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We present a review of Higgs physics in the SM and beyond, including the tests of the Higgs boson properties that have been performed at LHC and have permitted to delineate its profile. After presenting the essential features of the BEH mechanism, and its implementation in the SM, we discuss how the Higgs mass limits developed over the years. These constraints in turn helped to classify the Higgs phenomenology (decays and production mechanisms), which provided the right direction to search for the Higgs particle, an enterprise that culminated with its discovery at LHC. So far, the constraints
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10

Trifyllis, Lampros. "The Higgs di-photon decay in the standard model effective field theory." Facta universitatis - series: Physics, Chemistry and Technology 17, no. 1, spec.issue (2019): 89–96. http://dx.doi.org/10.2298/fupct1901089t.

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Starting from the Standard Model (SM) of elementary particle physics, we assume that new physics effects can be encoded in higher-dimensional operators added in the SM Lagrangian. The resulting theory, the SM Effective Field Theory (SMEFT), is then used for high-accuracy phenomenological studies. Through this paper, the di-photon decay of the Higgs boson is used as a sample of a concrete calculation in the SMEFT framework.
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11

Avrin, J. S. "ALONGSIDE THE STANDARD MODEL: UNIFICATION VIA GEOMETRY." International Journal of Modern Physics A 16, supp01c (2001): 916–18. http://dx.doi.org/10.1142/s0217751x01008485.

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A geometrical model (GM) featuring a visualizable reduction of the elementary particles and interactions down to common elements has been developed. As a consequence, a taxonomy of particles and various interactions emerge, all in consonance with the Standard Model (SM) of particle physics. However, the GM goes well beyond the SM, incorporating a number of fundamental phenomena and issues for which the latter has no explanation. Since the GMs largely diagramatic development cannot be displayed in this brief paper, only a summary of its conceptual basis and consequences is presented herein.
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12

Lapi, Andrea, Tommaso Ronconi, Lumen Boco, et al. "Astroparticle Constraints from Cosmic Reionization and Primordial Galaxy Formation." Universe 8, no. 9 (2022): 476. http://dx.doi.org/10.3390/universe8090476.

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We derived astroparticle constraints in different dark matter scenarios that are alternatives to cold dark matter (CDM): thermal relic warm dark matter, WDM; fuzzy dark matter, ψDM; self-interacting dark matter, SIDM; sterile neutrino dark matter, νDM. Our framework is based on updated determinations of the high-redshift UV luminosity functions for primordial galaxies to redshift z∼10, on redshift-dependent halo mass functions in the above DM scenarios from numerical simulations, and on robust constraints on the reionization history of the Universe from recent astrophysical and cosmological da
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13

Koren, Seth. "A Note on Proton Stability in the Standard Model." Universe 8, no. 6 (2022): 308. http://dx.doi.org/10.3390/universe8060308.

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In this short note, we describe the symmetry responsible for absolute, nonperturbative proton stability in the Standard Model. The SM with Nc colors and Ng generations has an exact, anomaly-free, generation-independent, global symmetry group U(1)B−NcL×ZNgL, which contains a subgroup of baryon plus lepton number of order 2NcNg. This disallows proton decay for Ng>1. Many well-studied models beyond the SM explicitly break this global symmetry, and the alternative deserves further attention.
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14

FUKUYAMA, TAKESHI. "SEARCHING FOR NEW PHYSICS BEYOND THE STANDARD MODEL IN ELECTRIC DIPOLE MOMENT." International Journal of Modern Physics A 27, no. 16 (2012): 1230015. http://dx.doi.org/10.1142/s0217751x12300153.

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This is a theoretical review of exploration of new physics beyond the Standard Model (SM) in the electric dipole moment (EDM) in elementary particles, atoms and molecule. EDM is a very important CP violating phenomenon and sensitive to new physics. Starting with the estimations of EDM of quarks–leptons in SM, we explore new signals beyond SM. However, these works drive us to wider frontiers where we search fundamental physics using atoms and molecules and vice versa. Paramagnetic atoms and molecules have great enhancement factor on electron EDM. Diamagnetic atoms and molecules are very sensiti
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15

SAU, GOUTAM, and S. BHATTACHARYYA. "ON THE SPECIAL SIGNIFICANCE OF THE LATEST PAMELA RESULTS IN ASTROPARTICLE PHYSICS." Modern Physics Letters A 27, no. 24 (2012): 1250143. http://dx.doi.org/10.1142/s021773231250143x.

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In continuation of their earlier measurements, the PAMELA group reported data on antiproton flux and [Formula: see text] ratios in 2010 at much higher energies. In the past we had dealt with these specific aspects of PAMELA data in great detail and each time we captured the contemporary data-trends quite successfully with the help of a multiple production model of secondary antiprotons with some nonstandard ilk and with some other absolutely standard assumptions and approximations. In this work we aim at presenting a comprehensive and valid description of all the available data on antiproton f
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16

WANG, SONG-MING. "SEARCHES FOR THE STANDARD MODEL HIGGS BOSON AT THE CDF EXPERIMENT." International Journal of Modern Physics A 24, no. 04 (2009): 617–56. http://dx.doi.org/10.1142/s0217751x09043298.

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The understanding of the dynamics behind the breaking of the electroweak symmetry is one of the most important goals in the field of high energy physics. In the Standard Model (SM) Higgs mechanism plays a key role in the symmetry breaking, one manifestation of which is spin-0 Higgs boson. Thus the search for the Higgs boson is one of the flag-ship analyses at the Tevatron. Over the past few years the CDF experiment has made significant improvements in its sensitivity on the search for the SM Higgs boson. In this paper we summarize CDF's most recent results on the searches for the SM Higgs boso
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17

Cui, Chuan-Xin, Jin-Yang Li, Hiroyuki Ishida, Mamiya Kawaguchi, Shinya Matsuzaki, and Akio Tomiya. "New Indication from Quantum Chromodynamics Calling for beyond the Standard Model." Universe 10, no. 2 (2024): 68. http://dx.doi.org/10.3390/universe10020068.

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We find that a big gap between indicators for the breaking strengths of the global chiral SU(2) and U(1) axial symmetries in the QCD of the standard model (SM) can be interpreted as a new fine-tuning problem. This may thus imply calling for a class beyond the SM, which turns out to favor having a new chiral symmetry, and the associated massless new quark is insensitive to the chiral SU(2) symmetry for the lightest up and down quarks so that the fine-tuning is relaxed. Our statistical estimate shows that QCD of the SM is by more than 300 standard deviations off the parameter space free from fin
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18

Morais, António P., Roman Pasechnik, and Werner Porod. "Grand Unified Origin of Gauge Interactions and Families Replication in the Standard Model." Universe 7, no. 12 (2021): 461. http://dx.doi.org/10.3390/universe7120461.

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The tremendous phenomenological success of the Standard Model (SM) suggests that its flavor structure and gauge interactions may not be arbitrary but should have a fundamental first-principle explanation. In this work, we explore how the basic distinctive properties of the SM dynamically emerge from a unified New Physics framework tying together both flavor physics and Grand Unified Theory (GUT) concepts. This framework is suggested by a novel anomaly-free supersymmetric chiral E6×SU(2)F×U(1)F GUT containing the SM. Among the most appealing emergent properties of this theory is the Higgs-matte
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19

Jenni, Peter. "Early physics results." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1961 (2012): 933–49. http://dx.doi.org/10.1098/rsta.2011.0463.

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For the past year, experiments at the Large Hadron Collider (LHC) have started exploring physics at the high-energy frontier. Thanks to the superb turn-on of the LHC, a rich harvest of initial physics results have already been obtained by the two general-purpose experiments A Toroidal LHC Apparatus (ATLAS) and the Compact Muon Solenoid (CMS), which are the subject of this report. The initial data have allowed a test, at the highest collision energies ever reached in a laboratory, of the Standard Model (SM) of elementary particles, and to make early searches Beyond the Standard Model (BSM). Sig
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20

DAS, C. R., and LARISA LAPERASHVILI. "SEESAW SCALES AND STEPS FROM THE STANDARD MODEL TOWARDS SUPERSTRING-INSPIRED FLIPPED E6." International Journal of Modern Physics A 24, no. 32 (2009): 6011–33. http://dx.doi.org/10.1142/s0217751x09047430.

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Recently in connection with superstring theory and with an alternative nonsupersymmetric "Exceptionally Simple Theory of Everything," E8 and E6 unifications became very promising. In the present paper we have investigated a number of available paths from the Standard Model (SM) to the E6 unification, considering chains of flipped models following the extension of the SM, also a chain with a left–right symmetry. We have presented four examples including nonsupersymmetric and supersymmetric extensions of the SM and different contents of the Higgs bosons providing the breaking of the flipped SO(1
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21

SAMUEL, MARK A. "THE TAU-LEPTON AND TESTS OF THE STANDARD MODEL." Modern Physics Letters A 08, no. 26 (1993): 2491–96. http://dx.doi.org/10.1142/s0217732393002816.

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Using a new value for the mass of the tau-lepton we reconsider various tests of the Standard Model (SM) for the tau. The agreement with the SM is much improved. All tests agree within 1.2σ or smaller and the so-called “tau-lifetime problem” has disappeared. We also obtain bounds on the mass of the tau-neutrino. It is shown that an improved bound [Formula: see text] MeV at 95% C.L. can be obtained at the τ-charm factory in Spain or at a proposed B-factory.
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22

Rosner, Jonathan L. "Resource Letter: SM-1: The standard model and beyond." American Journal of Physics 71, no. 4 (2003): 302–18. http://dx.doi.org/10.1119/1.1539087.

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23

CHOUDHURY, S. RAI, A. S. CORNELL, NAVEEN GAUR, and G. C. JOSHI. "SIGNATURES OF NEW PHYSICS IN DILEPTONIC B-DECAYS." International Journal of Modern Physics A 21, no. 12 (2006): 2617–34. http://dx.doi.org/10.1142/s0217751x06029491.

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Leptonic decays of B-mesons are theoretically very clean probes for testing the Standard Model (SM) and possible physics beyond it. Amongst the various leptonic decays of the B-meson, the pure dileptonic decay B → ℓ+ ℓ- is very important, as this mode is helicity suppressed in the SM but can be substantially enhanced in some of the models beyond the SM, such as supersymmetric (SUSY) theories and the two Higgs doublet model (2HDM). Although the purely dileptonic decay mode is helicity suppressed in the SM its associated mode B → ℓ+ ℓ-γ does not have the same suppression, due to the presence of
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24

Çiftçi, A. K., and R. Çiftçi. "General structure of democratic mass matrix of lepton sector in E6 model." Canadian Journal of Physics 96, no. 7 (2018): 834–36. http://dx.doi.org/10.1139/cjp-2017-0783.

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An extension of the Standard Model (SM) fermion sector, which is inspired by the E6 grand unified theory model, may be a good candidate to explain a number of unanswered questions in SM. Existence of the E6 leptons may explain great mass difference of charged and neutral leptons. Also, democracy on mass matrix elements is a natural approach in SM. In this study, we have given general structure of democratic mass matrix of lepton sector in E6 model.
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25

Datta, A. "Is there new physics in B decays?" Canadian Journal of Physics 85, no. 6 (2007): 607–12. http://dx.doi.org/10.1139/p07-066.

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Rare decays of the B meson are sensitive to new physics effects. Several experimental results on these decays have been difficult to understand within the Standard Model (SM) though more precise measurements and a better understanding of SM theory predictions are needed before any firm conclusions can be drawn. In this note we try to understand the present data assuming the presence of new physics. We find that the data points to new physics of an extended Higgs sector and we present a two-Higgs-doublet model with a 2–3 flavor symmetry in the down-type quark sector that can explain the deviati
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26

Lagouri, Theodota. "Review on Higgs hidden-dark sector physics." Physica Scripta 97, no. 2 (2022): 024001. http://dx.doi.org/10.1088/1402-4896/ac42a6.

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Abstract The Standard Model (SM), while extremely powerful as a description of the strong, electromagnetic and weak interactions, does not provide a natural candidate to explain Dark Matter (DM). Theoretical as well as experimental motivation exists for the existence of a hidden or dark sector of phenomena that couples either weakly or in a special way to SM fields. Hidden sector or dark sector states appear in many extensions to SM to provide a particular candidate DM in the universe or to explain astrophysical observations. If there is such a family of Beyond the Standard Model (BSM) particl
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27

Vizgin, Vladimir. "Standard Models in Physics and Cosmology: Formation, Relationship and Russia’s Contribution to Their Development." Science Management: Theory and Practice 7, no. 2 (2025): 129–45. https://doi.org/10.19181/smtp.2025.7.2.7.

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The article examines the formation and development of standard models (SM) in elementary particle physics and cosmology (SM-1 and SM-2). SM-1 encompasses quantum chromodynamics and electroweak theory. It is the theoretical foundation of microphysics. Based on the theory of the expanding universe, SM-2 is the theoretical basis of relativistic cosmology. The combination of these models provides a fairly complete and empirically reasonable description of the physical world. Particular attention is paid to Russian researchers’ contribution to their creation. A chronology of the most important even
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28

Ma, Jian-Ping. "Chapter 1 Physics Goal of BES-III." International Journal of Modern Physics A 24, supp01 (2009): 3–7. http://dx.doi.org/10.1142/s0217751x09046412.

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The Standard Model (SM) has been successful at describing all relevant experimental phenomena and, thus, has been generally accepted as the fundamental theory of elementary particle physics. Despite its success, the SM leaves many unanswered questions. These can be classified into two main categories: one for subjects related to possible new physics at unexplored energy scales and the other for nonperturbertive physics, mostly related to Quantum Chromodynamics…
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29

Campani, Alice, Valentina Dompè, and Guido Fantini. "Status and Perspectives on Rare Decay Searches in Tellurium Isotopes." Universe 7, no. 7 (2021): 212. http://dx.doi.org/10.3390/universe7070212.

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Neutrinoless double beta decay (0νββ) is a posited lepton number violating decay whose search is an increasingly active field in modern astroparticle physics. A discovery would imply neutrinos are Majorana particles and inform neutrino physics, cosmology and beyond-standard-model theories. Among the few nuclei where double beta decay (ββ) is allowed, tellurium isotopes stand for their high natural abundance and are currently employed in multiple experiments. The search for 0νββ will provide large exposure data sets in the coming years, paving the way for unprecedented sensitivities. We review
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Chekanov, Sergei, and Walter Hopkins. "Event-Based Anomaly Detection for Searches for New Physics." Universe 8, no. 10 (2022): 494. http://dx.doi.org/10.3390/universe8100494.

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This paper discusses model-agnostic searches for new physics at the Large Hadron Collider using anomaly-detection techniques for the identification of event signatures that deviate from the Standard Model (SM). We investigate anomaly detection in the context of a machine-learning approach based on autoencoders. The analysis uses Monte Carlo simulations for the SM background and several selected exotic models. We also investigate the input space for the event-based anomaly detection and illustrate the shapes of invariant masses in the outlier region which will be used to perform searches for re
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31

Vizgin, Vl P. "METAPHYSICAL ASPECTS OF THE STANDARD MODEL OF THE ELEMENTARY PARTICLES PHYSICS AND THE HISTORY OF ITS CREATION." Metafizika, no. 3 (December 15, 2020): 39–56. http://dx.doi.org/10.22363/2224-7580-2020-3-39-56.

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Metaphysical aspects of the standard model (SM) of the modern elementary particles theory are considered. This article briefly views a history of the formation of the SM (from fundamental paper of C. Yang and R. Mills (1954) to the completion of electroweak theory and quantum chromodynamics in the early 1970s). Three groups of the interrelated metaphysical aspects are discussed: local gauge symmetry’s structure of the theory, problem of the truth and reality and the role of the metaphysical factors in the construction of the theory. Scientific-realistic nature of the SM creator’s metaphysical
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Kawana, Kiyoharu. "Classical conformality in the Standard Model from Coleman’s theory." Modern Physics Letters A 31, no. 31 (2016): 1650176. http://dx.doi.org/10.1142/s0217732316501765.

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The classical conformality (CC) is one of the possible candidates for explaining the gauge hierarchy of the Standard Model (SM). We show that it is naturally obtained from the Coleman’s theory on baby universe.
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Mavromatos, Nick E. "Small-Scale Cosmology “Crisis” and Self-Interacting Right-Handed Neutrino Warm Dark Matter." EPJ Web of Conferences 182 (2018): 01001. http://dx.doi.org/10.1051/epjconf/201818201001.

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In the lecture, I first review the basic problems of the ΔCDM model at small (galactic) scales, also known as “small-scale Cosmology crisis”, namely discrepancies between theoretical simulations and observations. I then argue how systems of righthanded neutrinos (RHN) with masses of order 50 keV in the galaxies can tackle these problems, provided appropriately strong RHN self-interactions are included. Such models may constitute interesting minimal extensions of the Standard Model. Combining galactic phenomenology with other astroparticle physics considerations of such models, one arrives at a
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AZIZ, TARIQ. "INTERNAL SELF-CONSISTENCY OF WEAK NEUTRAL CURRENT DATA AT LEP/SLC FAVORS PHYSICS BEYOND STANDARD MODEL." Modern Physics Letters A 09, no. 20 (1994): 1857–66. http://dx.doi.org/10.1142/s0217732394001726.

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The recent measurements of Rb=Γb/Γhad together with other experimentally independent measurements of weak neutral current observables at LEP/SLC, display excellent internal self-consistency if the top dependent [Formula: see text] vertex correction is ignored. Extending this consistency further, the possibility of ignoring even the propagator/oblique corrections is not ruled out. Being a clean top mass indicator within SM, free from Higgs and strong interaction uncertainty, a comparison of Rb with the directly measured top quark mass at Tevatron clearly strengthens the above view. To preserve
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Andersson, Martin, Alexander Mclean Marshall, Konstantinos A. Petridis, and Eluned Smith. "Strange Things in Bottom-to-Strange Decays: The Standard Model Turned Upside Down?" Symmetry 16, no. 6 (2024): 638. http://dx.doi.org/10.3390/sym16060638.

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The flavour anomalies are a set of experimental deviations from the Standard Model (SM) predictions in several observables involving decays of bottom quarks. In particular, tensions between theory and experiment in measurements involving a bottom quark decaying into a strange quark and a pair of muons have motivated much theoretical work to explore possible new physics explanations. This review summarises the tumultuous evolution of these tensions, focusing on the most recent experimental results and their implications for physics beyond the SM. We also discuss the prospects for future measure
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Ali, Ahmed. "Precision tests of the Standard Model: Rare B-meson decays." International Journal of Modern Physics A 32, no. 09 (2017): 1741015. http://dx.doi.org/10.1142/s0217751x17410159.

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The charge given to me by the organisers of the memorial meeting for Prof. Abdus Salam’s 90th birthday is to recall my personal impressions of him and review an aspect of the standard model (SM) physics related to my work. Salam was, first and foremost, a brilliant theoretical physicist whose work is still very much en vogue, currently being tested precisely by the experiments at the Large Hadron Collider (LHC). Salam was, however, equally effective as a scientific advisor to many institutions, such as IAEA and CERN, but also to the government of Pakistan as the chief scientific strategist. He
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37

Robens, Tania. "The THDMa Revisited." Symmetry 13, no. 12 (2021): 2341. http://dx.doi.org/10.3390/sym13122341.

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The THDMa is a new physics model that extends the scalar sector of the Standard Model by an additional doublet as well as a pseudoscalar singlet and allows for mixing between all possible scalar states. In the gauge-eigenbasis, the additional pseudoscalar serves as a portal to the dark sector, with a priori any dark matter spins states. The option where dark matter is fermionic is currently one of the standard benchmarks for the experimental collaborations, and several searches at the LHC constrain the corresponding parameter space. However, most current studies constrain regions in parameter
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38

HEWETT, JOANNE L., and THOMAS G. RIZZO. "$B_s^0 \ndash - \bar B_s^0 $ MIXING IN THE FOUR GENERATION STANDARD MODEL." Modern Physics Letters A 03, no. 10 (1988): 975–80. http://dx.doi.org/10.1142/s0217732388001148.

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We examine the constraints imposed by recent data on [Formula: see text] mixing, ε′/ε, and |Vub|/|Vcb| on the size of [Formula: see text] mixing in the four generation standard model (SM). We show that, unlike the SM with only three generations, [Formula: see text] mixing need not be maximal in the four generation case. In particular, we show that it is quite likely that [Formula: see text] mixing is smaller than [Formula: see text] mixing.
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39

Vizgin, Vladimir P. "Socio-Cultural Aspects of the Standard Model in Elementary Particles Physics and the History of Its Creation." Epistemology & Philosophy of Science 57, no. 3 (2020): 160–75. http://dx.doi.org/10.5840/eps202057348.

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The article соnsiders the socio-cultural aspects of the standard model (SM) in elementary particle physics and history of its creation. SM is a quantum field gauge theory of electromagnetic, weak and strong interactions, which is the basis of the modern theory of elementary particles. The process of its elaboration covers a twenty-year period: from 1954 (the concept of gauge fields by C. Yang and R. Mills) to the early 1970s., when the construction of renormalized quantum chromodynamics and electroweak theory wеre completed. The socio-cultural aspects of SM are explored on the basis of a quasi
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40

Lagouri, Theodota. "Review on Higgs Hidden–Dark Sector Physics at High-Energy Colliders." Symmetry 14, no. 7 (2022): 1299. http://dx.doi.org/10.3390/sym14071299.

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The presence of a hidden or dark sector of phenomena that relates either weakly or in a particular way to Standard Model (SM) fields has theoretical as well as experimental support. Many extensions of SM use hidden or dark sector states to propose a specific candidate for dark matter (DM) in the universe or to explain astrophysical findings. If such a family of Beyond the Standard Model (BSM) particles and interactions exists, it is possible that they will be discovered experimentally at CERN’s Large Hadron Collider (LHC, √s≅14 TeV) and future High Energy Colliders. The primary emphasis is on
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41

GOLDFAIN, ERVIN. "FEIGENBAUM ATTRACTOR AND THE GENERATION STRUCTURE OF PARTICLE PHYSICS." International Journal of Bifurcation and Chaos 18, no. 03 (2008): 891–96. http://dx.doi.org/10.1142/s0218127408020756.

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The standard model (SM) for high-energy physics describes fundamental interactions between subatomic particles down to a distance scale on the order of 10-18 m. Despite its widespread acceptance, SM operates with a large number of arbitrary parameters whose physical origin is presently unknown. Our work suggests that the generation structure of at least some SM parameters stems from the chaotic regime of renormalization group flow. Invoking the universal route to chaos in systems of nonlinear differential equations, we argue that the hierarchical pattern of parameters amounts to a series of sc
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42

Dorokhov, A. E., A. E. Radzhabov, and A. S. Zhevlakov. "Past, present and future of the muon g-2." International Journal of Modern Physics: Conference Series 39 (January 2015): 1560107. http://dx.doi.org/10.1142/s2010194515601076.

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The electron and muon anomalous magnetic moments (AMM) are measured in experiments and studied in the Standard Model (SM) with the highest precision accessible in particle physics. The comparison of the measured quantity with the SM prediction for the electron AMM provides the best determination of the fine structure constant. The muon AMM is more sensitive to the appearance of New Physics effects and, at present, there appears to be a three- to four-standard deviation between the SM and experiment. The lepton AMMs are pure relativistic quantum correction effects and therefore test the foundat
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43

Ströher, Hans, Sebastian M. Schmidt, Paolo Lenisa, and Jörg Pretz. "Precision Storage Rings for Electric Dipole Moment Searches: A Tool En Route to Physics Beyond-the-Standard-Model." Particles 6, no. 1 (2023): 385–98. http://dx.doi.org/10.3390/particles6010020.

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Electric Dipole Moments (EDM) of particles (leptons, nucleons, and light nuclei) are currently deemed one of the best indicators for new physics, i.e., phenomena which lie outside the Standard Model (SM) of elementary particle physics—so-called physics “Beyond-the-Standard-Model” (BSM). Since EDMs of the SM are vanishingly small, a finite permanent EDM would indicate charge-parity (CP) symmetry violation in addition to the well-known sources of the SM, and could explain the baryon asymmetry of the Universe, while an oscillating EDM would hint at a possible Dark Matter (DM) field comprising axi
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44

Matute, Ernesto A. "Presymmetry in the Standard Model with adulterated Dirac neutrinos." Modern Physics Letters A 30, no. 31 (2015): 1550160. http://dx.doi.org/10.1142/s0217732315501606.

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Recently we proposed a model for light Dirac neutrinos in which two right-handed (RH) neutrinos per generation are added to the particles of the Standard Model (SM), implemented with the symmetry of fermionic contents. The ordinary one is decoupled via the high scale type-I seesaw mechanism, while the extra pairs off with its left-handed (LH) partner. The symmetry of lepton and quark contents was merely used as a guideline to the choice of parameters because it is not a proper symmetry. Here we argue that the underlying symmetry to take for this correspondence is presymmetry, the hidden electr
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45

LONDON, DAVID. "CP VIOLATION IN THE B SYSTEM: MEASURING NEW-PHYSICS PARAMETERS." International Journal of Modern Physics A 19, no. 31 (2004): 5463–75. http://dx.doi.org/10.1142/s0217751x04022712.

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I review CP violation in the standard model (SM). I also describe the predictions for CP violation in the B system, along with signals for physics beyond the SM. I stress the numerous contributions of Pat O'Donnell to this subject. Finally, I discuss a new method for measuring new-physics parameters in B decays. This knowledge will allow us to partially identify any new physics which is found, before its direct production at high-energy colliders.
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46

Sun, Ke-Sheng, Jian-Bin Chen, Xiu-Yi Yang та Hai-Bin Zhang. "One-loop correction to Z → νν in the minimal R-symmetric supersymmetric Standard Model". Modern Physics Letters A 34, № 07n08 (2019): 1950058. http://dx.doi.org/10.1142/s0217732319500585.

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We analyze the one-loop correction to [Formula: see text] decay in framework of Minimal R-symmetric Supersymmetric Standard Model (MRSSM) in detail with normal and inverse neutrino mass orderings, as a function of [Formula: see text], Dirac mass parameters [Formula: see text] and [Formula: see text], slepton mass [Formula: see text] that parametrize the mass matrices. The numerical results indicate that the branching ratio for [Formula: see text] decay is compatible with the experimental measurement and the SM expectation at [Formula: see text] level. For inverse neutrino mass ordering, the pr
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47

Gary, J. William. "New results on low energy exclusive hadronic final states from BABAR." EPJ Web of Conferences 172 (2018): 04002. http://dx.doi.org/10.1051/epjconf/201817204002.

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The 3.6 standard deviation discrepancy between the standard model (SM) prediction for the muon anomalous magnetic moment gμ - 2 and the corresponding experimental measurement is one of the most persistent and intriguing potential signals in particle physics for physics beyond the SM. The largest uncertainty in the SM prediction for gμ - 2 arises from the uncertainty in the measured low energy inclusive e+e- → hadrons cross section. New results from the BABAR experiment at SLAC for the e+e- → π+ π- π0 π0 and e+e- → KK ππ cross sections are presented that significantly reduce this uncertainty. N
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48

Asner, D. M., I. I. Bigi, J. Charles, et al. "Charm Physics." International Journal of Modern Physics A 24, supp01 (2009): 499–502. http://dx.doi.org/10.1142/s0217751x09046801.

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Nobody doubts that the discovery of hadrons with charm of the hidden and open variety – i.e. charmonium as well as D mesons – was instrumental in the acceptance of the Standard Model (SM) in general, and of quarks as physical degrees of freedom, rather than objects of mere mathematical convenience, in particular. Yet charm is all too often viewed as a quantum number with a great past and with no particularly interesting future. This is due to SM predictions of a rather dull electroweak phenomenology of CKM parameters, a low frequency for [Formula: see text] oscillations, tiny (at best) CP asym
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49

Moussa, Mohamed. "Constraining unparticle-inspired model parameters using dwarf stars." International Journal of Modern Physics D 30, no. 05 (2021): 2150031. http://dx.doi.org/10.1142/s0218271821500310.

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The unparticle-inspired model of gravity suggested by Georgi is based on that the standard model (SM) may contain a massive but scale invariant particles, which can be exchanged between SM massive particles, leading to a new force called ungravity. This would add a perturbed term to the Newtonian law of gravity at low energy. We use the minimum mass of hydrogen burning (MMHB) to constrain the relevant parameters of unparticle inspired model of gravity, on scales [Formula: see text] and [Formula: see text].
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50

Zhao, Minggang. "New Physics Beryond the SM at BESIII." EPJ Web of Conferences 212 (2019): 06004. http://dx.doi.org/10.1051/epjconf/201921206004.

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Numerous astrophysical observations strongly suggest the existence of Dark Matter, which provides a hint of dark sector physics. There could exist many dark candidates predicted by theories BSM, such as dark photons and invisible things, that communicate with the Standard Model sector. The masses and decay modes of these particles are expected to be accessible at the BESIII experiment which is the only currently running tau-charm factory with the largest threshold charm samples and some other unique datasets. We have recently performed searches of dark photons and invisible things in several d
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