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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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 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.
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.
Cern Courier
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Author :
language : en
Publisher:
Release Date : 2016
Cern Courier written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Nuclear energy categories.
Top Quark Pair Production
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Author : Anna Christine Henrichs
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-04
Top Quark Pair Production written by Anna Christine Henrichs and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-04 with Science categories.
Before any kind of new physics discovery could be made at the LHC, a precise understanding and measurement of the Standard Model of particle physics' processes was necessary. The book provides an introduction to top quark production in the context of the Standard Model and presents two such precise measurements of the production of top quark pairs in proton-proton collisions at a center-of-mass energy of 7 TeV that were observed with the ATLAS Experiment at the LHC. The presented measurements focus on events with one charged lepton, missing transverse energy and jets. Using novel and advanced analysis techniques as well as a good understanding of the detector, they constitute the most precise measurements of the quantity at that time.
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
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Here, this paper describes a measurement of the inclusive top quark pair production cross-section (?tt¯) with a data sample of 3.2fb–1 of proton–proton collisions at a centre-of-mass energy of √s=13TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b -tagged jets are counted and used to determine simultaneously ?tt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties.
Measurement Of The Top Quark Pair Production Cross Section In Proton Proton Collisions At Center O Mass Energies Of 7 Tev In Final States With A Tau Lepton With The Atlas Detector
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Author : Universitat de València. Facultat de Física
language : en
Publisher:
Release Date : 2014
Measurement Of The Top Quark Pair Production Cross Section In Proton Proton Collisions At Center O Mass Energies Of 7 Tev In Final States With A Tau Lepton With The Atlas Detector written by Universitat de València. Facultat de Física and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Recueil Festival D Edimbourg 1947
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Author :
language : en
Publisher:
Release Date : 1949
Recueil Festival D Edimbourg 1947 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1949 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.