Bibliografie tematiche / Four-top-quark

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Letteratura scientifica selezionata sul tema "Four-top-quark"

Autore: Grafiati

Pubblicato: 10 maggio 2025

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Articoli di riviste sul tema "Four-top-quark"

Blekman, Freya, Fréderic Déliot, Valentina Dutta e Emanuele Usai. "Four-top quark physics at the LHC". Universe 8, n. 12 (30 novembre 2022): 638. http://dx.doi.org/10.3390/universe8120638.

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Abstract (sommario):

The production of four top quarks presents a rare process in the Standard Model that provides unique opportunities and sensitivity to Standard Model observables including potential enhancement of many popular new physics extensions. This article summarises the latest experimental measurements of the four-top quark production cross section at the LHC. An overview is provided detailing interpretations of the experimental results regarding the top quark Yukawa coupling in addition to the limits on physics beyond the Standard Model. Further, prospects for future measurements and opportunities offered by this challenging final state are given herein.

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Darmé, Luc, Benjamin Fuks e Mark Goodsell. "Cornering sgluons with four-top-quark events". Physics Letters B 784 (settembre 2018): 223–28. http://dx.doi.org/10.1016/j.physletb.2018.08.001.

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Cao, Qing-Hong, Jun-Ning Fu, Yandong Liu, Xiao-Hu Wang e Rui Zhang. "Probing top-philic new physics via four-top-quark production *". Chinese Physics C 45, n. 9 (1 settembre 2021): 093107. http://dx.doi.org/10.1088/1674-1137/ac0c6f.

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Fariborz, Amir H., Renata Jora, Salah Nasri e Joseph Schechter. "A hierarchy of the quark masses in a top condensate model with multiple Higgses". Modern Physics Letters A 29, n. 06 (28 febbraio 2014): 1450030. http://dx.doi.org/10.1142/s0217732314500308.

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We discuss the quark masses in a top condensate model where not only two quark but also four quark composite states may exist. We show that the presence of the top color group SU (3)1× SU (3)2 with the correct quark representations can justify even in the absence of the additional technicolor interactions a hierarchy of the quark masses where the light quarks masses have the same size, the charm and bottom masses are higher and similar and the top is the heaviest.

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Morozumi, Takuya, Apriadi Salim Adam, Yuta Kawamura, Albertus Hariwangsa Panuluh, Yusuke Shimizu e Kei Yamamoto. "Effective theory for universal seesaw model and FCNC". Journal of Physics: Conference Series 2446, n. 1 (1 febbraio 2023): 012046. http://dx.doi.org/10.1088/1742-6596/2446/1/012046.

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Abstract We study the quark sector of the universal seesaw model with SU(2) L × SU(2) R × U(1). The model incorporates the seesaw mechanism with the vector-like quarks (VLQs). The purpose of this work is to study the model with the effective theory. After integrating the heavy five VLQs, we derive the effective theory with four up-type quark and three down type quark. In this work, the FCNC of Z boson for top quark and top′ quark is derived.

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Castro, Andrea. "Top-quark mass at hadron colliders". International Journal of Modern Physics A 29, n. 22 (29 agosto 2014): 1430029. http://dx.doi.org/10.1142/s0217751x14300294.

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Top-quarks can be produced abundantly at hadron colliders like the Tevatron at Fermilab and the Large Hadron Collider at CERN, and a variety of measurements of top-quark properties have been gathered in the recent years from four experiments: CDF and D0 at the Tevatron and ATLAS and CMS at the Large Hadron Collider. In this review the most recent results on the measurement of the top-quark mass by the four different collaborations, with various techniques and considering different topologies, are reported.

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Malekhosseini, Maliheh, e Mehrdad Ghominejad. "Top quark flavor changing neutral currents and dipole moments through three and four top-quark productions at the LHC". Journal of Physics: Conference Series 1137 (gennaio 2019): 012014. http://dx.doi.org/10.1088/1742-6596/1137/1/012014.

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Carena, M., H. E. Haber e C. E. M. Wagner. "Four-generation low energy supersymmetry with a light top quark". Nuclear Physics B 472, n. 1-2 (luglio 1996): 55–78. http://dx.doi.org/10.1016/0550-3213(96)00257-x.

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Alici, E., e M. Köksal. "Probing the anomalous tqγ couplings through single top production at the future lepton–hadron colliders". Modern Physics Letters A 34, n. 36 (27 novembre 2019): 1950298. http://dx.doi.org/10.1142/s0217732319502985.

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Abstract (sommario):

The measurements of the top quark flavor changing neutral current interactions are one of the most important goals of the top quark physics program in the present and the future collider experiments. These measurements provide direct information on nonstandard interactions of the top quark. Within the framework of new physics beyond the Standard Model, these interactions can be defined by an effective Lagrangian. In this study, we have investigated the potential of the future [Formula: see text] colliders on the top quark flavor changing neutral current interactions through the subprocesses [Formula: see text], where [Formula: see text]. These subprocesses have been produced through the main reaction [Formula: see text] at the LHC-[Formula: see text], the FCC-[Formula: see text] and the SPPC-[Formula: see text]. For the main reaction, the total cross-sections have been calculated as a function of the anomalous [Formula: see text] couplings. In addition, sensitivities on [Formula: see text] at 95% Confidence Level have been calculated. We obtain that the best constraints on [Formula: see text] are at the order of [Formula: see text] which is four orders of magnitude better than the LHC’s experimental results.

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Ferreira da Silva, P. "Physics of the Top Quark at the LHC: An Appraisal and Outlook of the Road Ahead". Annual Review of Nuclear and Particle Science 73, n. 1 (25 settembre 2023): 255–84. http://dx.doi.org/10.1146/annurev-nucl-102419-052854.

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Abstract (sommario):

Since its start, the Large Hadron Collider (LHC) has helped advance both theory and experiment on the production and properties of the heaviest fundamental particle, the top quark. This review focuses on a selected set of measurements and associated searches for new physics, which have opened the door for unprecedented precision in this area of high-energy physics. Fundamental parameters of the theory such as m t, αS, V tb, and y t are measured from top quark events with relative uncertainties that are smaller than 0.5%, 1.8%, 2%, and 10%, respectively, and that are expected to improve with more data, better experimental methods, and more accurate theory predictions. Several results, even if statistically limited, already significantly constrain the phase space of new physics: measurements of associated production with bosons, processes with four top quarks, and searches for rare decays, among others. It is expected that until the completion of the LHC program, top quark physics will keep providing unique insights regarding the consistency of the Standard Model and the energy scale of new physics.

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Più fonti

Tesi sul tema "Four-top-quark"

Chen, Xiang. "Search for new physics in the four-top-quark production at the ATLAS experiment". Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP002.

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Le Modèle Standard (MS) de la physique des particules constitue le cadre fondamental décrivant les particules élémentaires et leurs interactions. Parmi ses découvertes majeures figure le boson de Higgs, observé en 2012 au Grand Collisionneur de Hadrons (LHC), qui complète le MS et explique la génération de la masse via le mécanisme de Higgs. Le quark top, la particule fondamentale la plus lourde connue, joue un rôle clé dans la stabilité duvide et sert de sonde unique pour la recherche de nouvelle physique. Cette thèse présente la première observation de la production de quatre quarks top(��̄��̄) lors de collisions proton-proton à √�� = 13 TeV, en utilisant 140 fb⁻¹ de données de l’expérience ATLAS. La section efficace mesurée, 22,5 +6,6 −5,5 fb, est en accord avec les prédictions du MS, avec une significativité observée (attendue) de 6.1σ (4.3) σ soit une amélioration de 42 % (65 %) par rapport aux résultats antérieurs. Cette sensibilité accrue résulte d’une meilleure modélisation des bruits de fond, d’une reconstruction améliorée des leptons et de l’utilisation de techniques multivariées avancées. Les résultats contraignent les opérateurs de théorie des champs effectifs tels que cQt1, ctt1, cQQ1 et cQt8, avec des limites sur leurs coefficients (Ci/Λ²) allant de [−1,9 ; 2,1] à [−6,9 ; 7,6] TeV⁻². Par ailleurs, une mesure innovante de la masse polaire du quark top est réalisée à l’aide de sections efficaces différentielles doubles ��̄ à la précision NNLO, exploitant 36 fb⁻¹ de données, avec une incertitude ciblée entre 0,6 % et 1,7%.Une étude annexe démontre également une amélioration de l’identification des jets W/Z boostés grâce à l’algorithme Unified Flow Objects (UFO). Ces avancées approfondissent notre compréhension des propriétés du quark top, testent rigoureusement le Modèle Standard, et ouvrent des perspectives pour la découverte d’une physique au-delà de celui-ci
The Standard Model (SM) of particle physics provides the foundational framework describing elementary particles and their interactions. Among its key discoveries was the Higgs boson, observed at the Large Hadron Collider (LHC) in 2012, which completes the SM and explains mass generation via the Higgs mechanism. The top quark, the heaviest known fundamental particle, plays a critical role in vacuum stability and serves as a unique probe for new physics. This thesis presents the first observation of four-top-quark production (��̄��̄) in proton-proton collisions at √�� = 13 TeV using 140 fb⁻¹ of ATLAS data. The measured cross-section, 22.5 +6.6 −5.5 fb, agrees with SM predictions, with an observed (expected) significance of 6.1σ (4.3σ). Enhanced sensitivity stems from improved background modeling, lepton reconstruction, and multivariate techniques. The results constrain effective field theory operators such as the cQt1, ctt1, cQQ1 and cQt8, with limits on their coefficients (Ci/Λ²) ranging from [−1.9, 2.1] to [−6.9, 7.6] TeV⁻². Additionally, a novel measurement of the top quark pole mass is performed using double-differential ��̄ cross-sections at NNLO precision with 36 fb⁻¹ of data, targeting a precision of 0.6–1.7%. A study in the appendix demonstrates improved identification of boosted ��/�� jets via the Unified Flow Objects (UFO) algorithm. These advancements deepen our understanding of top quark properties, rigorously test the SM, and pave the way for discoveries beyond

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Heer, Sebastian [Verfasser]. "Top-quark pair production in association with a Z boson in the final state with four charged leptons / Sebastian Heer". Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1200019903/34.

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Paredes, Hernández Daniela. "Search for New Physics in events with 4 top quarks in the ATLAS detector at the LHC". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00921146.

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Abstract (sommario):

This thesis presents the search for New Physics in events with four top quarks using the data collected in proton-proton collisions by the ATLAS experiment at the LHC. The dataset corresponds to the one taken during all 2011 at √s = 7 TeV and a part of 2012 at √s = 8 TeV. The analysis focuses on a final state with two leptons (electrons and muons) with the same electric charge. This signature is experimentally favored since the presence of two same-sign leptons in the final state allows to reduce the background coming from Standard Model (SM) processes. The results are interpreted in the context of a low energy effective field theory, which assumes that New Physics at low energy can manifest itself as a four right-handed top contact interaction. In this context, this analysis allows testing a class of beyond-the-SM (BSM) theories which at low energy can manifest in this way. Backgrounds to this search have been estimated using simulated samples and data-driven techniques. Different sources of systematic uncertainties have been also considered. The final selection of events has been optimized by aiming at minimizing the expected upper limit on the four tops production cross-section in case of no signal events found. The signal region is then analyzed by looking for an excess of events with respect to the predicted background. No excess of events has been observed, and the observed upper limit on the four tops production cross-section has been computed. This limit is then translated to an upper limit on the coupling strength C=2 of the model. An upper limit on the four tops production cross-section in the SM has been also computed in the analysis performed at √s = 8 TeV. In addition to the physics analysis of the four tops signal, some studies about the LASER calibration system of the ATLAS Tile calorimeter are presented. In particular, they are related to the photodiodes system used to measure the intensity of the laser light in the LASER system.

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Sohns, Fabian. "Search for the production of four top quarks in proton-proton collisions at $\sqrt{s}=13\,$TeV in the single and opposite sign dilepton channels with the ATLAS detector at the LHC using a Monte Carlo correction method". Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-14AD-2.

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Sabatini, Paolo. "Search for the production of four top quarks in proton-proton collisions at $\sqrt{s}=13$ TeV in the single lepton and opposite-sign dilepton channels with the ATLAS detector at the Large Hadron Collider". Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1439-5.

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Capitoli di libri sul tema "Four-top-quark"

Zinn-Justin, Jean. "Gross–Neveu–Yukawa and Gross–Neveu models". In Quantum Field Theory and Critical Phenomena, 489–506. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834625.003.0020.

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In this chapter, a model is considered that can be defined in continuous dimensions, the Gross– Neveu–Yukawa (GNY) model, which involves N Dirac fermions and one scalar field. The model has a continuous U(N) symmetry, and a discrete symmetry, which prevents the addition of a fermion mass term to the action. For a specific value of a coefficient of the action, the model undergoes a continuous phase transition. The broken phase illustrates a mechanism of spontaneous symmetry breaking, leading to spontaneous fermion mass generation like in the Standard Model (SM) of particle physics. In four dimensions, the GNY can be considered as a toy model to represent the interactions between the top quark and the Higgs boson, the heaviest particles of the SM of fundamental interactions, when the gauge fields are omitted. The model is renormalizable in four dimensions and its renormalization group (RG) properties can be studied in d = 4 and d = 4 − ϵ dimensions. A model of self-interacting fermions with the same symmetries and fermion content, the Gross–Neveu (GN) model, has been widely studied. In perturbation theory, for d > 2, it describes only a phase with massless fermions but, in d = 2 + ϵ dimensions, the RG indicates that, at a critical value of the coupling constant, the model experiences a phase transition. In two dimensions, it is renormalizable and exhibits the phenomenon of asymptotic freedom. The massless phase becomes infrared unstable and there is strong evidence that the spectrum corresponds to spontaneous symmetry breaking and fermion mass generation.

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Atti di convegni sul tema "Four-top-quark"

El Faham, Hesham. "Complete study of four top quark production at the LHC in the SMEFT". In 41st International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0874.

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Serkin, Leonid. "Search for the SM four top quark production with the ATLAS detector at the LHC." In 38th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.282.1148.

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Serkin, Leonid. "Search for the SM four-top-quark production in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector". In The 39th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.340.0906.

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Rapporti di organizzazioni sul tema "Four-top-quark"

Guillian, Eugene Hall. Top quark decay kinematics in fully reconstructed top anti-top events in the electron or muon + E($T$) + greater than or equal to four jet decay. Office of Scientific and Technical Information (OSTI), gennaio 1999. http://dx.doi.org/10.2172/1421509.

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