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Artykuły w czasopismach na temat "Quatre quarks top"
Putak Juriček, Marija, i Vesnica Garašić. "GEOCHEMISTRY AND PETROGRAPHY OF METAMORPHIC SOLE AMPHIBOLITES FROM THE SLATINA QUARRY, MT. ZRINSKA GORA, CROATIA". Rudarsko-geološko-naftni zbornik 39, nr 2 (2024): 97–110. http://dx.doi.org/10.17794/rgn.2024.2.8.
Pełny tekst źródłaLuna Morales, Mª Elena, i 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, nr 1 (30.03.2005). http://dx.doi.org/10.3989/redc.2005.v28.i1.162.
Pełny tekst źródłaMartins Hummel, Carolina, Maria Clara Rocha Zica i 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, 10.02.2023. http://dx.doi.org/10.5102/pic.n0.2021.8974.
Pełny tekst źródłaRozprawy doktorskie na temat "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.
Pełny tekst źródłaThe 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.
Pełny tekst źródłaSimon, 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.
Pełny tekst źródłaDespite 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.
Pełny tekst źródłaChevalérias, 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.
Pełny tekst źródłaThis 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.
Pełny tekst źródłaStrandberg, 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.
Pełny tekst źródłaThis 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.
Pełny tekst źródłaBilokin, 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.
Pełny tekst źródłaThis 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.
Pełny tekst źródłaKsiążki na temat "Quatre quarks top"
e̕man, Yuval Ne. The particle hunters. Wyd. 2. Cambridge [England]: Cambridge University Press, 1996.
Znajdź pełny tekst źródłaArnold, J. Douglas. Nintendo 64: Survival Guide Volume Two. Lahaina, Maui, HI: Sandwich Islands Publishing Company, 1998.
Znajdź pełny tekst źródłaVigdor, Steven E. Trinity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0003.
Pełny tekst źródłaVigdor, Steven E. Water, Water, Here and There. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0004.
Pełny tekst źródłaO’Madagain, Cathal. Outsourcing Concepts. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198801764.003.0003.
Pełny tekst źródłaVigdor, Steven E. Where’s the Antimatter Gone, Long Time Passing? Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814825.003.0002.
Pełny tekst źródłaCampbell, John, Joey Huston i Frank Krauss. Data at the TEVATRON. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199652747.003.0008.
Pełny tekst źródłaKalinin, A. A., Ye E. Savchenko i 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.
Pełny tekst źródłaLongstaffe, Stephen. The Plebeians Revise the Uprising. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198806899.003.0006.
Pełny tekst źródłaBouchez, Jean-Luc, i Adolphe Nicolas. Principles of Rock Deformation and Tectonics. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192843876.001.0001.
Pełny tekst źródłaCzęści książek na temat "Quatre quarks top"
Henrichs, Anna Christine. "The Top Quark in the Context of the Standard Model". W Top Quark Pair Production, 5–26. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_2.
Pełny tekst źródłaQuadt, Arnulf. "Top quark physics at hadron colliders". W 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.
Pełny tekst źródłaKieseler, Jan. "Extraction of the Top-Quark Mass". W 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.
Pełny tekst źródłaDefranchis, Matteo M. "Simultaneous Measurement of the Top Quark Pair Production Cross Section and the Top Quark Mass". W 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.
Pełny tekst źródłaKieseler, Jan. "Calibration of the Top-Quark Monte-Carlo Mass". W 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.
Pełny tekst źródłaKieseler, Jan. "Measurement of the Top-Quark Pair Production Cross Section". W 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.
Pełny tekst źródłaHenrichs, Anna Christine. "Introduction". W Top Quark Pair Production, 1–3. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_1.
Pełny tekst źródłaHenrichs, Anna Christine. "Experimental Setup". W Top Quark Pair Production, 27–44. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_3.
Pełny tekst źródłaHenrichs, Anna Christine. "Objects and Processes". W Top Quark Pair Production, 45–89. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_4.
Pełny tekst źródłaHenrichs, Anna Christine. "General Analysis Strategy". W Top Quark Pair Production, 91–123. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01487-6_5.
Pełny tekst źródłaStreszczenia konferencji na temat "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". W The European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2014. http://dx.doi.org/10.22323/1.180.0247.
Pełny tekst źródłaCuevas Maestro, Javier. "Top Quark Properties". W XIII International Conference on Heavy Quarks and Leptons. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.274.0039.
Pełny tekst źródłaFernandez Menendez, Javier. "Top-quark properties". W Fourth Annual Large Hadron Collider Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.276.0038.
Pełny tekst źródłaIorio, Alfredo. "Top quark measurements". W XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.265.0010.
Pełny tekst źródłaErbacher, Robin D. "Top Quark Physics". W XXV PHYSICS IN COLLISION: Proceedings of the XXV International Conference on Physics in Collision. AIP, 2006. http://dx.doi.org/10.1063/1.2173574.
Pełny tekst źródłaJUSTE, AURELIO. "TOP QUARK MEASUREMENTS". W Proceedings of the XXII International Symposium. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812704023_0001.
Pełny tekst źródłaBoos, E. "TOP QUARK PHYSICS". W Proceedings of the 12th Lomonosov Conference on Elementary Particle Physics. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812772657_0049.
Pełny tekst źródłaSchulze, Markus. "Top quark physics". W Sixth Annual Conference on Large Hadron Collider Physics. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.321.0135.
Pełny tekst źródłaLarios, F. "Top Quark Physics". W PARTICLES AND FIELDS: X Mexican Workshop on Particles and Fields. AIP, 2006. http://dx.doi.org/10.1063/1.2359399.
Pełny tekst źródłaMeyer, Andreas. "Top Quark Properties". W XXVII International Symposium on Lepton Photon Interactions at High Energies. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.245.0028.
Pełny tekst źródłaRaporty organizacyjne na temat "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), styczeń 2006. http://dx.doi.org/10.2172/898403.
Pełny tekst źródłaMaki, Tuula. Top quark mass measurement. Office of Scientific and Technical Information (OSTI), marzec 2008. http://dx.doi.org/10.2172/924194.
Pełny tekst źródłaSmirnov, 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), październik 2005. http://dx.doi.org/10.2172/1415850.
Pełny tekst źródłaCassada, Josh Aaron. A Search for new particles decaying into top quark anti-top quark pairs. Office of Scientific and Technical Information (OSTI), styczeń 2000. http://dx.doi.org/10.2172/1375733.
Pełny tekst źródłaThompson, J. Observation of the top quark. Office of Scientific and Technical Information (OSTI), maj 1995. http://dx.doi.org/10.2172/79708.
Pełny tekst źródłaWicke, Daniel. Properties of the Top Quark. Office of Scientific and Technical Information (OSTI), sierpień 2009. http://dx.doi.org/10.2172/979414.
Pełny tekst źródłaProtopopescu, P. Observation of the top quark. Office of Scientific and Technical Information (OSTI), wrzesień 1995. http://dx.doi.org/10.2172/105721.
Pełny tekst źródłaJaros, John A. Top Quark Physics: Future Measurements. Office of Scientific and Technical Information (OSTI), maj 2003. http://dx.doi.org/10.2172/813089.
Pełny tekst źródłaDemers 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), styczeń 2004. http://dx.doi.org/10.2172/1369284.
Pełny tekst źródłaHsieh, Tzu-Chung Frank. Measurement of the top quark mass. Office of Scientific and Technical Information (OSTI), styczeń 1998. http://dx.doi.org/10.2172/1372275.
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