Measurement Of The Top Quark Pair Production Cross Section And An In Situ B Tagging Efficiency Calibration With Atlas In Pp Collisions At S
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Measurement Of The Top Quark Pair Production Cross Section And An In Situ B Tagging Efficiency Calibration With Atlas In Pp Collisions At S
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Author : Bin Guo
language : en
Publisher:
Release Date : 2012
Measurement Of The Top Quark Pair Production Cross Section And An In Situ B Tagging Efficiency Calibration With Atlas In Pp Collisions At S written by Bin Guo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We present a measurement of the top anti-top quark (ttbar)production cross section in the dilepton final states from proton-proton collisions at a center of mass energy at 7 TeV at the LHC. A b-tagging algorithm based on tracks displaced from the event interaction vertex is applied to identify bottom quark jets from top quark decay and reject background events. Given the relatively pure sample of bottom quark jets in ttbar dilepton final states, a new technique to measure in-situ the b-tagging efficiency is introduced that uses the distribution of the number of observed b-tagged jets. We present results with data collected at the ATLAS detector in 2010 with an integrated luminosity of 35 pb-1. The measured ttbar cross section is 176 +22/-21 (stat.) ± 20 (syst.) ± 6 (lum.) pb in the dilepton channel. We will also discuss the future prospects of this measurement.
Search For Flavor Changing Neutral Current Top Quark Decays T Hq With H Bb In Pp Collisions At S 8 Tev With The Atlas Detector
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Author : Shota Tsiskaridze
language : en
Publisher: Springer
Release Date : 2017-08-02
Search For Flavor Changing Neutral Current Top Quark Decays T Hq With H Bb In Pp Collisions At S 8 Tev With The Atlas Detector written by Shota Tsiskaridze and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-02 with Science categories.
This PhD thesis focuses on the search for flavor-changing neutral currents in the decay of a top quark to an up-type quark (q = u, c) and the Standard Model Higgs boson, where the Higgs boson decays to bb. Further, the thesis presents the combination of this search for top quark pair events with other ATLAS searches – in the course of which the most restrictive bounds to date on tqH interactions were obtained. Following on from the discovery of the Higgs boson, it is particularly important to measure the Yukawa couplings of the Standard Model fermions; these parameters may provide crucial insights to help solve the flavor puzzle and may help reveal the presence of new physics before it is directly observed in experiments.
Expected Performance Of The Atlas Experiment
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Author :
language : en
Publisher:
Release Date : 2009
Expected Performance Of The Atlas Experiment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Colliders (Nuclear physics) categories.
The Beauty And The Boost A Higgs Boson Tale
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Author : Brian Moser
language : en
Publisher: Springer Nature
Release Date : 2023-09-19
The Beauty And The Boost A Higgs Boson Tale written by Brian Moser and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-19 with Science categories.
Precision measurements of the Higgs boson’s properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.
Measurement Of The Top Quark Pair Production Cross Section And An In Situ B Tagging Efficiency Calibration With Atlas In Proton Proton Collisions At Center Of Mass Energy
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Author : Bin Guo
language : en
Publisher:
Release Date : 2011
Measurement Of The Top Quark Pair Production Cross Section And An In Situ B Tagging Efficiency Calibration With Atlas In Proton Proton Collisions At Center Of Mass Energy written by Bin Guo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We present a measurement of the top anti-top quark (tt ̄ ) production cross section in the dilepton final states from proton-proton collisions at a center of mass energy at 7 TeV at the LHC. A b-tagging algorithm based on tracks displaced from the event interaction vertex is applied to identify bottom quark jets from top quark decay and reject background events. Given the relatively pure sample of bottom quark jets in tt ̄ dilepton final states, a new technique to measure in-situ the b-tagging efficiency is introduced that uses the distribution of the number of observed b-tagged jets. We present results with data collected at the ATLAS detector in 2010 with an integrated luminosity of 35 pb -1. The measured tt ̄ cross section is 176+22-21stat. +20-20 (syst.) +/- 6 (lum.) pb in the dilepton channel. We will also discuss the future prospects of this measurement.
Measurement Of The T Bar T Production Cross Section With An In Situ Calibration Of B Jet Identification Efficiency
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of The T Bar T Production Cross Section With An In Situ Calibration Of B Jet Identification Efficiency written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
A measurement of the top-quark pair-production cross section in p{bar p} collisions at √s = 1.96 TeV using data corresponding to an integrated luminosity of 1.12 fb−1 collected with the Collider Detector at Fermilab is presented. Decays of top-quark pairs into the final states e[nu] + jets and [mu][nu] + jets are selected, and the cross section and the b-jet identification efficiency are determined using a new measurement technique which requires that the measured cross sections with exactly one and multiple identified b-quarks from the top-quark decays agree. Assuming a top-quark mass of 175 GeV/c2, a cross section of 8.5 ± 0.6(stat.) ± 0.7(syst.) pb is measured.
Measurement Of The Top Quark Pair Production Cross Section With Soft Muon B Tagging In Pp Collisions At Square Root S
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Author : Andrew James Poll
language : en
Publisher:
Release Date : 2011
Measurement Of The Top Quark Pair Production Cross Section With Soft Muon B Tagging In Pp Collisions At Square Root S written by Andrew James Poll and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Measurement Of The Top Quark Pair Production Cross Section With Atlas In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of The Top Quark Pair Production Cross Section With Atlas In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Measurements Of The Top Quark Pair Production Cross Section In Lepton Jets Final States Using A Topological Multivariate Technique As Well As Lifetime B Tagging In Proton Anti Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2005
Measurements Of The Top Quark Pair Production Cross Section In Lepton Jets Final States Using A Topological Multivariate Technique As Well As Lifetime B Tagging In Proton Anti Proton Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Two alternative measurements of the t¯t production cross section at √s = 1.96 TeV in proton-antiproton collisions in the lepton+jets channel are presented. The t¯t production cross section is extracted by combining the kinematic event information in a multivariate discriminant. The measurement yields ?p¯p → t¯t + x = 5.13-1.57+1.76(stat)-1.10+0.96(syst) ± 0.33 (lumi) pb in the muon+jets channel, using 229.1 pb-1, and in the combination with the electron+jets channel (226.3 pb-1) ?p¯p → t¯t + x = 6.60-1.28+1.37(stat)-1.11+1.25(syst) ± 0.43 (lumi) pb. The second measurement presented reconstructs explicitly secondary vertices to d lifetime b-tagging. The measurement combines the muon+jets and the electron+jets channel, using 158.4 pb-1 and 168.8 pb-1, respectively: ?p¯p → t¯t + x = 8.24-1.25+1.34(stat)-1.63+1.89(syst) ± 0.54 (lumi) pb.
Measurements Of The Top Quark Pair Production Cross Section In Lepton Jets Final States Using A Topological Multivariate Technique As Well As Lifetime B Tagging In Proton Anti Proton Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2006
Measurements Of The Top Quark Pair Production Cross Section In Lepton Jets Final States Using A Topological Multivariate Technique As Well As Lifetime B Tagging In Proton Anti Proton Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Abstract Not Provided.