Measurement Of The Inclusive Electron Cross Section From Heavy Flavour Decays And Search For Compressed Supersymmetric Scenarios With The Atlas Experiment
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Measurement Of The Inclusive Electron Cross Section From Heavy Flavour Decays And Search For Compressed Supersymmetric Scenarios With The Atlas Experiment
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Author : Moritz Backes
language : en
Publisher: Springer
Release Date : 2014-06-11
Measurement Of The Inclusive Electron Cross Section From Heavy Flavour Decays And Search For Compressed Supersymmetric Scenarios With The Atlas Experiment written by Moritz Backes and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-11 with Science categories.
The first part of this thesis presents the measurement of the inclusive cross-section for electron production from heavy-flavour decays in the electron transverse momentum range 7 GeV
Measurement Of The Inclusive Electron Cross Section From Heavy Flavour Decays And Of The Bottom Production Rate With The Atlas Experiment
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Author : María Clemencia Rosario Mora Herrera
language : en
Publisher:
Release Date : 2012
Measurement Of The Inclusive Electron Cross Section From Heavy Flavour Decays And Of The Bottom Production Rate With The Atlas Experiment written by María Clemencia Rosario Mora Herrera 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.
A Cross Section Measurement Of Events With Two Muons At The Z0 Resonance And At Least One Heavy Flavour Jet At The Atlas Experiment Of The Large Hadron Collider
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Author :
language : en
Publisher:
Release Date : 2012
A Cross Section Measurement Of Events With Two Muons At The Z0 Resonance And At Least One Heavy Flavour Jet At The Atlas Experiment Of The Large Hadron Collider written by 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.
Cross Section Measurement And Search For New Physics With Top Quark Pair Events Involving A Tau Lepton In Atlas
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Author : Jennifer Lynn Godfrey
language : en
Publisher:
Release Date : 2013
Cross Section Measurement And Search For New Physics With Top Quark Pair Events Involving A Tau Lepton In Atlas written by Jennifer Lynn Godfrey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Higgs bosons categories.
In 2011, the ATLAS detector recorded an integrated luminosity of over 5 fb−1 of proton-proton collisions delivered by the LHC at a centre-of-mass square root of s = 7 TeV. The first of two analyses is a test of the standard model and the world's most precise measurement of the top quark pair production cross section for final states which include a hadronically decaying tau lepton. The second analysis uses the same dataset to search for a charged Higgs boson, also resulting in the world's best limits for the search channel. In the cross section measurement, 2.1 fb−1 of ATLAS proton-proton collision data is used to measure the top quark pair production cross section in events containing an isolated electron or muon and a tau lepton decaying hadronically. After initial event requirements, the leading background comes from top quark pairs with jets faking tau leptons. A fit to a tau lepton identification variable is used to determine the signal yield. The measured cross section, [sigma][subscript{tt̄}] 186"13(stat.)"2019(syst.)"7(lumi.)pb, is in good agreement with the standard model prediction. Several extensions to the standard model predict the existence of at least one charged Higgs boson, H[superscript "]. According to these extensions, the top quark can decay into a bottom quark and a light charged Higgs boson in addition to the standard model decay to a bottom quark and aW boson. In the second analysis, event yield ratios between different final states are measured using 4.6 fb−1 of ATLAS data. This is compared to simulation to search for a violation of lepton universality. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviations from the standard model predictions are observed. With the assumption that the charged Higgs boson branching ratio to a tau lepton and a neutrino is 100%, upper limits in the range 3.2%-4.4% can be placed on the top quark to charged Higgs branching ratio for 90 less than or equal to m[subscript {H[superscript "]}] less than or equal to 140 GeV. After combination with results from a search for charged Higgs bosons in tt̄ decays using the thad+jets final state, upper limits on this branching ratio can be set in the range 0.8%-3.4%, for 90 less than or equal to m[subscript {H[superscript "]}] less than or equal to 140 GeV.
A Measurement Of Inclusive Quasielastic Electron Cross Sections At X 1 And High Q2
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Author :
language : en
Publisher:
Release Date : 2002
A Measurement Of Inclusive Quasielastic Electron Cross Sections At X 1 And High Q2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Experiment E89-008 measured inclusive electron scattering cross sections from different nuclei in Hall C at Jefferson Laboratory. Cross sections on the low energy loss side of the quasi-elastic peak (x{sub Bj}> 1) are extracted for carbon, aluminum, iron and gold. The data cover four-momentum transfers squared of 0:97 to 5:73 GeV 2 =c 2 . The measured cross sections are compared to cross sections calculated using a microscopic spectral function. The cross section results are also analyzed in terms of the two scaling functions F (y) and f(psi). For both the data is found to be independent of the momentum transfer (scaling of the first kind). For f(psi) the data is in addition independent of the mass number A (scaling of the second kind) and thus exhibits superscaling properties.
Measurement Of The High Mass Drell Yan Differential Cross Section In The Electron Positron Channel With The Atlas Experiment At S
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Author : Katalin Nikolics
language : en
Publisher:
Release Date : 2013
Measurement Of The High Mass Drell Yan Differential Cross Section In The Electron Positron Channel With The Atlas Experiment At S written by Katalin Nikolics 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.
Measurement Of The Inclusive W Pm And Z Gamma Cross Sections In The Electron And Muon Decay Channels In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of The Inclusive W Pm And Z Gamma Cross Sections In The Electron And Muon Decay Channels 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.
Measurement Of Inclusive Electron Cross Section In Gammagamma Collisions At Tristan
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Author : M. Iwasaki
language : en
Publisher:
Release Date : 1994
Measurement Of Inclusive Electron Cross Section In Gammagamma Collisions At Tristan written by M. Iwasaki and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Measurement Of The Mathrm T Bar T Production Cross Section In The Mathrm E Mu Channel In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Mathrm T Bar T Production Cross Section In The Mathrm E Mu Channel In Proton Proton 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 2016 with categories.
The inclusive cross section for top quark pair production is measured in proton-proton collisions at √s = 7 and 8 TeV, corresponding to 5.0 and 19.7 fb-1, respectively, with the CMS experiment at the LHC. The cross sections are measured in the electron-muon channel using a binned likelihood fit to multi-differential final state distributions related to identified b quark jets and other jets in the event. The measured cross section values are 173.6 ± 2.1 (stat)+4.5-4.0 (syst) ± 3.8 (lumi) pb at √s = 7 TeV, and 244.9 ± 1.4 (stat)+6.3-5.5 (syst) ± 6.4 (lumi) pb at √s = 8 TeV, in good agreement with QCD calculations at next-to-next-to-leading-order accuracy. The ratio of the cross sections measured at 7 and 8 TeV is determined, as well as cross sections in the fiducial regions defined by the acceptance requirements on the two charged leptons in the final state. The cross section results are used to determine the top quark pole mass via the dependence of the theoretically predicted cross section on the mass, giving a best result of 173.8+1.7-1.8 GeV. Furthermore, the data at √s = 8 TeV are also used to set limits, for two neutralino mass values, on the pair production of supersymmetric top squarks with masses close to the top quark mass.
A Measurement Of The T Bar T Production Cross Section In P Bar P Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2008
A Measurement Of The T Bar T Production Cross Section In P Bar P 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 2008 with categories.
I present a measurement of the t$ar{t}$ production cross section at √s = 1.96 TeV using 2034 pb-1 of CDF Run II data using events with a high transverse momentum electron or muon, three or more jets, and missing transverse energy. The measurement assumes a t → Wb branching fraction of 100 percent. Events consistent with t$ar{t}$ decay are found by identifying jets containing heavy-flavor semileptonic decays to muons. The dominant backgrounds are evaluated directly from the data. Based on 248 candidate events and an expected background of 86.8 ± 5.6 events, I measure a production cross section of 8.7 ± 1.1$+0.9top{-0.8}$ ± 0.6 pb, in agreement with the Standard Model.