Littérature scientifique sur le sujet « Quatre quarks top »
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Articles de revues sur le sujet "Quatre quarks top"
Putak Juriček, Marija, et Vesnica Garašić. « GEOCHEMISTRY AND PETROGRAPHY OF METAMORPHIC SOLE AMPHIBOLITES FROM THE SLATINA QUARRY, MT. ZRINSKA GORA, CROATIA ». Rudarsko-geološko-naftni zbornik 39, no 2 (2024) : 97–110. http://dx.doi.org/10.17794/rgn.2024.2.8.
Texte intégralLuna Morales, Mª Elena, et Francisco Collazo Reyes. « Impact of a Big Science discovery, according to two scientific communication models : the case of top quark ». Revista española de Documentación Científica 28, no 1 (30 mars 2005). http://dx.doi.org/10.3989/redc.2005.v28.i1.162.
Texte intégralMartins Hummel, Carolina, Maria Clara Rocha Zica et Fabiana Xavier Cartaxo Salgado. « Manejo clínico e terapêutico de pacientes graves acometidos por Covid-19 em um hospital público do Distrito Federal ». Programa de Iniciação Científica - PIC/UniCEUB - Relatórios de Pesquisa, 10 février 2023. http://dx.doi.org/10.5102/pic.n0.2021.8974.
Texte intégralThèses sur le sujet "Quatre quarks top"
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.
Texte intégralThe 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
Paredes, Hernandez D. « Recherche de Nouvelle Physique dans les événements à quatre quarks top avec le détecteur ATLAS du LHC ». Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00932094.
Texte intégralSimon, Dorian. « Recherche de Nouvelle Physique dans les événements à quatre quarks top avec le sélecteur ATLAS auprès du LHC ». Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22590/document.
Texte intégralDespite its numerous success, like the recent discovery of a boson compatible with the BEH boson, the Standard Model shows some deficiences. Those lead to a search for New Physics, which may take, among others, the form of extra space dimensions. In this thesis, four-top-quarks events arising from a such model, the 2UED /RPP, are searched for. The 2UED /RPP has two universal extra space dimensions compactified under the Real Projective Plane geometry. This search uses a signature with ar least two same-sign leptons (electrons and/or muons). Two successive analyses are presented. The first one uses the first 14,3 fb-1 recorded during 2012 proton-proton collisions occurring with a collision center-of-mass referential energy of 8 TeV. In the case where both extra dimensions have the same compactification radius and where the branching ratio of A(1 ; 1) in tt is 100 %, this analysis puts a lower observed (expected) limit on mKK (main model parameter) at 0,90 TeV (0,92 TeV) with a confidence level of 95 %. The second analysis extend the first one to the full 20,3 fb-1 dataset while refining the procedures in use. An excess of data with a significance of less than 2,5 standard deviations is observed. Non of the cross-checks done shows any default which could explain the excess. The new limit is 0,96 TeV (1,05 TeV). This second analysis also allows to put limits on the model's parameters in other configurations. Finally, this document also presents the author's contribution to the first stages of the LASER II development. The LASER II is the new LASER calibration system of ATLAS's Tile Calorimeter
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.
Texte intégralChevalérias, Thibault. « Caractérisation de grands détecteurs Micromegas pour le projet New Small Wheel et recherche de la production de quatre quarks top avec le détecteur ATLAS au LHC ». Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS172/document.
Texte intégralThis doctoral work was carried out as a member of the ATLAS collaboration at the LHC, an accelerator with a center-of-mass energy of 13 TeV. The development of new Micromegas detectors for the NSW project has been studied, along with the search for a very rare physics process : the production of four top quarks at the LHC, at a center-of-mass energy of 13 TeV. The physics programme of the LHC plans a significant increase of the luminosity in the coming years, especially for the high-luminosity phase beginning in 2026. Some parts of the ATLAS detectors must be upgraded to cope with the increased radiation levels. The small wheels of the muon spectrometer will be replaced by new small wheels (NSW) using Micromegas detectors. IRFU is responsible for producing some of the detectors, which performances are being validated on a test bench using cosmic muons. During this doctoral work, the aim was to develop an analysis code for the test bench data, in order to characterize the Micromegas detectors of the NSW project. The code provides gain and detection efficiency informations, and will be used until the end of the project. The measured efficiencies are in agreement with the expectations except in some parts of the detectors that are being investigated. The top quark plays a central role in many theories beyond the standard model, for instance in models with extra dimensions, or with a modification of the Higgs boson sector. Many of these models predict an enhanced cross section for the very rare four top quark process, which is predicted to be approximately 12 fb at 13 TeV. The study of the four top quark process is particularly interesting in the channel with leptons having the same electric charge because of the very low background level. This doctoral work is firstly carried out on the data taken in 2015 and 2016 by the ATLAS detector, in order to study the four top quark process and some new physics models. This process is very challenging given the very low number of events, and the difficult estimation of the fake lepton background. Several limits are set on new physics models and on the standard model four top quark production. The results on the standard model process are combined with the results from the single lepton channel to set the tightest limit at the time of its publication. The four top quark production is being studied again, using the data taken from 2015 to 2018 this time, with the aim of making a first observation of this process. The doctoral work is focused on a new method for estimating the fake lepton background
Sánchez, Carlos Andrés. « Measurement of the Top Quark Mass with Neural Networks ». The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1039046089.
Texte intégralStrandberg, Jonas. « Top Quarks at the Tevatron : Measurements of the Top Quark Production and Decay with the D0 Experiment ». Doctoral thesis, Stockholm University, Department of Physics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-879.
Texte intégralThis thesis presents two measurements of the top quark using 230 pb-1 of data taken with the D0 detector at the Tevatron accelerator. The first measurement determines the top pair production cross section at sqrt(s)=1.96 TeV in proton-antiproton collisions. In the standard model of particle physics the top quark decays almost exclusively into a W boson and a b quark. Candidate events are selected by requiring that at least one jet in the event is tagged with the secondary vertex algorithm. The measured top pair production cross section is:
8.6 +1.6-1.5 (stat. + syst.) +- 0.6 (lumi.) pb.
The second measurement uses the observed and predicted number of events with 0, 1 and 2 b-tagged jets to estimate the ratio R:
R = B(t->Wb) / B(t->Wq)
where q stands for any down-type quark. The measured value is
R = 1.03 +0.19-0.17 (stat. + syst.)
in good agreement with the standard model prediction of R=1. The result can be used to obtain a lower limit for R:
R > 0.61 (95% C.L.).
Moniez, Marc. « Recherche du quark top auprès du détecteur UA2 au collisionneur proton-antiproton du CERN ». Paris 11, 1988. http://www.theses.fr/1988PA112214.
Texte intégralBilokin, Sviatoslav. « Cascades hadroniques dans un calorimètre électromagnétique silicium-tungstène hautement granulaire et production des quarks top et bottom à l'ILC ». Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS599/document.
Texte intégralThis thesis presents studies for the International Linear Collider (ILC),a linear electron-positron collider with a nominal center-of-mass energy of 500 GeV. Data are analysed that were recorded with the physics prototype of the CALICE silicon-tungsten electromagnetic calorimeter (Si-W ECAL) prototype at FermiLab in 2008. During this thesis, a track-finding algorithm was developed, which finds secondary tracks in hadronic events recorded by the Si-W ECAL physics prototype. This algorithm reveals details of hadronic interactions in the detector volume and the results are compared with simulations based on the geant4 toolkit.Indirect searches of New Physics require a high precision on the measurements of the Standard Model parameters. Many Beyond Standard Model theories, like extradimentional or composite models, imply modifications of electroweak couplings of the heavy quarks, top and bottom. The second part of the thesis is a full simulation study of vertexing algorithms in the ILD environment and the reconstruction of the b-quark charge. The b-quark charge reconstruction is essential for many physics channels at the ILC, particularly, for the e+ e− → bb̄ and the e+ e− → tt̄ channels. The developed algorithm improves the b-quark charge reconstruction performance.The b-quark charge reconstruction methods are applied to the tt̄ production process. This allows to increase statistics for the top quark electroweak form factor estimation w.r.t an earlier study and thus to decrease corresponding statistical uncertainties.The results of the detector study allow for an estimation of the ILC precision on the b-quark electroweak couplings and form factors. The ILC will be able to resolve the LEP anomaly in the bb̄ production process. The ILC precision on the right-handed Z⁰bb̄ coupling, a prime candidate for effects of new physics, is calculated to be at least 5 times better than theLEP experiments
Cinca, Diane. « Etude de la production de paires de quarks TOP avec ATLAS au LHC, mesure de la masse du quark TOP ». Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00653792.
Texte intégralLivres sur le sujet "Quatre quarks top"
e̕man, Yuval Ne. The particle hunters. 2e éd. Cambridge [England] : Cambridge University Press, 1996.
Trouver le texte intégralArnold, J. Douglas. Nintendo 64 : Survival Guide Volume Two. Lahaina, Maui, HI : Sandwich Islands Publishing Company, 1998.
Trouver le texte intégralVigdor, Steven E. Trinity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0003.
Texte intégralVigdor, Steven E. Water, Water, Here and There. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0004.
Texte intégralO’Madagain, Cathal. Outsourcing Concepts. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198801764.003.0003.
Texte intégralVigdor, Steven E. Where’s the Antimatter Gone, Long Time Passing ? Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0002.
Texte intégralCampbell, John, Joey Huston et Frank Krauss. Data at the TEVATRON. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199652747.003.0008.
Texte intégralKalinin, A. A., Ye E. Savchenko et V. Yu Prokofiev. Mineralogy and genesis of the Oleninskoe gold deposit (Kola Peninsula). FRC KSC RAS, 2021. http://dx.doi.org/10.37614/978.5.91137.446.4.
Texte intégralLongstaffe, Stephen. The Plebeians Revise the Uprising. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198806899.003.0006.
Texte intégralBouchez, Jean-Luc, et Adolphe Nicolas. Principles of Rock Deformation and Tectonics. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192843876.001.0001.
Texte intégralChapitres de livres sur le sujet "Quatre quarks top"
Henrichs, Anna Christine. « The Top Quark in the Context of the Standard Model ». Dans Top Quark Pair Production, 5–26. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_2.
Texte intégralQuadt, Arnulf. « Top quark physics at hadron colliders ». Dans Top Quark Physics at Hadron Colliders, 1–166. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71060-8_1.
Texte intégralKieseler, Jan. « Extraction of the Top-Quark Mass ». Dans Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass, 83–102. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40005-1_6.
Texte intégralDefranchis, Matteo M. « Simultaneous Measurement of the Top Quark Pair Production Cross Section and the Top Quark Mass ». Dans First Measurement of the Running of the Top Quark Mass, 67–91. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-90376-3_5.
Texte intégralKieseler, Jan. « Calibration of the Top-Quark Monte-Carlo Mass ». Dans Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass, 103–15. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40005-1_7.
Texte intégralKieseler, Jan. « Measurement of the Top-Quark Pair Production Cross Section ». Dans Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass, 57–81. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40005-1_5.
Texte intégralHenrichs, Anna Christine. « Introduction ». Dans Top Quark Pair Production, 1–3. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_1.
Texte intégralHenrichs, Anna Christine. « Experimental Setup ». Dans Top Quark Pair Production, 27–44. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_3.
Texte intégralHenrichs, Anna Christine. « Objects and Processes ». Dans Top Quark Pair Production, 45–89. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_4.
Texte intégralHenrichs, Anna Christine. « General Analysis Strategy ». Dans Top Quark Pair Production, 91–123. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_5.
Texte intégralActes de conférences sur le sujet "Quatre quarks top"
Soares, Mara Senghi. « Measurement of the properties of top quarks in decays (top quark and W polarization, top quark charge and couplings) with the CMS detector ». Dans The European Physical Society Conference on High Energy Physics. Trieste, Italy : Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.180.0247.
Texte intégralCuevas Maestro, Javier. « Top Quark Properties ». Dans XIII International Conference on Heavy Quarks and Leptons. Trieste, Italy : Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.274.0039.
Texte intégralFernandez Menendez, Javier. « Top-quark properties ». Dans Fourth Annual Large Hadron Collider Physics. Trieste, Italy : Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.276.0038.
Texte intégralIorio, Alfredo. « Top quark measurements ». Dans XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects. Trieste, Italy : Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.265.0010.
Texte intégralErbacher, Robin D. « Top Quark Physics ». Dans XXV PHYSICS IN COLLISION : Proceedings of the XXV International Conference on Physics in Collision. AIP, 2006. http://dx.doi.org/10.1063/1.2173574.
Texte intégralJUSTE, AURELIO. « TOP QUARK MEASUREMENTS ». Dans Proceedings of the XXII International Symposium. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812704023_0001.
Texte intégralBoos, E. « TOP QUARK PHYSICS ». Dans Proceedings of the 12th Lomonosov Conference on Elementary Particle Physics. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772657_0049.
Texte intégralSchulze, Markus. « Top quark physics ». Dans Sixth Annual Conference on Large Hadron Collider Physics. Trieste, Italy : Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.321.0135.
Texte intégralLarios, F. « Top Quark Physics ». Dans PARTICLES AND FIELDS : X Mexican Workshop on Particles and Fields. AIP, 2006. http://dx.doi.org/10.1063/1.2359399.
Texte intégralMeyer, Andreas. « Top Quark Properties ». Dans XXVII International Symposium on Lepton Photon Interactions at High Energies. Trieste, Italy : Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.245.0028.
Texte intégralRapports d'organisations sur le sujet "Quatre quarks top"
Strandberg, Jonas. Top quarks at the Tevatron : Measurements of the top quark production and decay with the D0 experiment. Office of Scientific and Technical Information (OSTI), janvier 2006. http://dx.doi.org/10.2172/898403.
Texte intégralMaki, Tuula. Top quark mass measurement. Office of Scientific and Technical Information (OSTI), mars 2008. http://dx.doi.org/10.2172/924194.
Texte intégralSmirnov, Dmitri. Measurement of the ratio of top-quark branching fractions top quark decaying to W boson and bottom quark and top quark decaying to W boson and any quark in the lepton + jets and dilepton channels at the Collider Detector at Fermilab. Office of Scientific and Technical Information (OSTI), octobre 2005. http://dx.doi.org/10.2172/1415850.
Texte intégralCassada, Josh Aaron. A Search for new particles decaying into top quark anti-top quark pairs. Office of Scientific and Technical Information (OSTI), janvier 2000. http://dx.doi.org/10.2172/1375733.
Texte intégralThompson, J. Observation of the top quark. Office of Scientific and Technical Information (OSTI), mai 1995. http://dx.doi.org/10.2172/79708.
Texte intégralWicke, Daniel. Properties of the Top Quark. Office of Scientific and Technical Information (OSTI), août 2009. http://dx.doi.org/10.2172/979414.
Texte intégralProtopopescu, P. Observation of the top quark. Office of Scientific and Technical Information (OSTI), septembre 1995. http://dx.doi.org/10.2172/105721.
Texte intégralJaros, John A. Top Quark Physics : Future Measurements. Office of Scientific and Technical Information (OSTI), mai 2003. http://dx.doi.org/10.2172/813089.
Texte intégralDemers Konezny, Sarah Marie. A measurement of the branching ratio of top quark decaying to tau lepton-neutrino-quark. Office of Scientific and Technical Information (OSTI), janvier 2004. http://dx.doi.org/10.2172/1369284.
Texte intégralHsieh, Tzu-Chung Frank. Measurement of the top quark mass. Office of Scientific and Technical Information (OSTI), janvier 1998. http://dx.doi.org/10.2172/1372275.
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