Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Gamma Gamma Decay Channel At The Atlas Experiment
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Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Gamma Gamma Decay Channel At The Atlas Experiment
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Author : Isabel Nitsche
language : en
Publisher:
Release Date : 2019
Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Gamma Gamma Decay Channel At The Atlas Experiment written by Isabel Nitsche and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Decay Channel At The Atlas Experiment
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Author : Isabel Nitsche
language : en
Publisher:
Release Date : 2019
Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Decay Channel At The Atlas Experiment written by Isabel Nitsche and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Jets categories.
Search For H U2192 Gamma Gamma Produced In Association With Top Quarks And Constraints On The Yukawa Coupling Between The Top Quark And The Higgs Boson Using Data Taken At 7 Tev And 8 Tev With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2015
Search For H U2192 Gamma Gamma Produced In Association With Top Quarks And Constraints On The Yukawa Coupling Between The Top Quark And The Higgs Boson Using Data Taken At 7 Tev And 8 Tev With The Atlas Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb-1 of proton–proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb-1 at 8 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess over the background prediction is observed and upper limits are set on the t¯tH production cross section. The observed exclusion upper limit at 95% confidence level is 6.7 times the predicted Standard Model cross section value. In addition, limits are set on the strength of the Yukawa coupling between the top quark and the Higgs boson, taking into account the dependence of the t¯tH and tH cross sections as well as the H→?? branching fraction on the Yukawa coupling. Lower and upper limits at 95% confidence level are set at -1.3 and +8.0 times the Yukawa coupling strength in the Standard Model.
Search For The Higgs Boson In The Tth H Bb Channel And The Identification Of Jets Containing Two B Hadrons With The Atlas Experiment
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Author : Royer Edson Ticse Torres
language : en
Publisher:
Release Date : 2016
Search For The Higgs Boson In The Tth H Bb Channel And The Identification Of Jets Containing Two B Hadrons With The Atlas Experiment written by Royer Edson Ticse Torres 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.
In July 2012, CERN announced the discovery of the Higgs boson, the last missing piece of the Standard Model (SM). The Higgs boson was observed in different channels. Precise measurement of its properties is now very important to investigate for possible deviations from the SM. This thesis presents a search for the Higgs boson produced in association with top quarks and decaying to a b quark pair, the ttH(H→bb) channel, using proton-proton collisions at √s = 13 TeV, collected with the ATLAS detector in 2015 and 2016. This document details in particular the full reconstruction of the ttH(H→bb) system and the discrimination between signal and the main background, tt+jets. The ttbb is a subset of the tt+jets backgrounds recent studies show that there is a large fraction of ttbb events with jets containing two b-hadrons. A new algorithm has been developed to discriminate such jets from single b-hadrons jets. The description of this tool is presented in this thesis.
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H 2 Tau Nu Using Pp Collision Data Recorded At Mml
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Author :
language : en
Publisher:
Release Date : 2016
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H 2 Tau Nu Using Pp Collision Data Recorded At Mml 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.
In this paper, charged Higgs bosons produced in association with a single top quark and decaying via H±→[tau][nu] are searched for with the ATLAS experiment at the LHC, using proton-proton collision data at √s=13 TeV corresponding to an integrated luminosity of 3.2 fb-1. The final state is characterised by the presence of a hadronic [tau] decay and missing transverse momentum, as well as a hadronically decaying top quark, resulting in the absence of high-transverse-momentum electrons and muons. The data are found to be consistent with the expected background from Standard Model processes. A statistical analysis leads to 95% confidence-level upper limits on the production cross section times branching fraction, [sigma](pp→[b]tH±)×BR(H±→[tau][nu]) , between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to 2000 GeV. Finally, the exclusion limits for this search surpass those obtained with the proton-proton collision data recorded at √s=8 TeV.
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H U2192 Using Pp Collision Data Recorded At
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Author :
language : en
Publisher:
Release Date : 2016
Search For Charged Higgs Bosons Produced In Association With A Top Quark And Decaying Via H U2192 Using Pp Collision Data Recorded At 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.
In this paper, charged Higgs bosons produced in association with a single top quark and decaying via H±→?? are searched for with the ATLAS experiment at the LHC, using proton–proton collision data at √s=13 TeV corresponding to an integrated luminosity of 3.2 fb-1. The final state is characterised by the presence of a hadronic ? decay and missing transverse momentum, as well as a hadronically decaying top quark, resulting in the absence of high-transverse-momentum electrons and muons. The data are found to be consistent with the expected background from Standard Model processes. A statistical analysis leads to 95% confidence-level upper limits on the production cross section times branching fraction, ?(pp→[b]tH±)×BR(H±→??) , between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to 2000 GeV. Finally, the exclusion limits for this search surpass those obtained with the proton–proton collision data recorded at √s=8 TeV.
Search For The Associated Production Of A Single Top Quark And A Higgs Boson In The H To Bbbar Decay Channel At 8 And 13 Tev With The Cms Experiment
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Author : Benedikt Maier
language : en
Publisher:
Release Date : 2016
Search For The Associated Production Of A Single Top Quark And A Higgs Boson In The H To Bbbar Decay Channel At 8 And 13 Tev With The Cms Experiment written by Benedikt Maier 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.
Search For H2 Gamma Gamma Produced In Association With Top Quarks And Constraints On The Yukawa Coupling Between The Top Quark And The Higgs Boson Using Data Taken At 7 Tev And 8 Tev With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2014
Search For H2 Gamma Gamma Produced In Association With Top Quarks And Constraints On The Yukawa Coupling Between The Top Quark And The Higgs Boson Using Data Taken At 7 Tev And 8 Tev With The Atlas Detector written by 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.
Search For The Standard Model Higgs Boson Produced In Association With Top Quarks
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Author :
language : en
Publisher:
Release Date : 2011
Search For The Standard Model Higgs Boson Produced In Association With Top Quarks written by 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.
Discovery Of The Higgs Boson Measurements Of Higgs Boson Properties And Search For High Mass Beyond The Standard Model Scalar Particle In The Diphoton Final State With The Atlas Detector At The Large Hadron Collider
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Author : Hongtao Yang
language : en
Publisher:
Release Date : 2016
Discovery Of The Higgs Boson Measurements Of Higgs Boson Properties And Search For High Mass Beyond The Standard Model Scalar Particle In The Diphoton Final State With The Atlas Detector At The Large Hadron Collider written by Hongtao Yang 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.
With 4.8~$\rm{fb}^{-1}$ of proton-proton collision data collected at $\sqrt{s}=7~\rm{TeV}$ in 2011, and 5.9~$\rm{fb}^{-1}$ collected at $\sqrt{s}=8~\rm{TeV}$ in 2012 by the ATLAS detector at the Large Hadron Collider, an excess of 4.5 standard deviations from the background-only hypothesis is observed near 126.5~GeV in the diphoton invariant mass spectra. Along with the excesses observed in the $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$ and $H \rightarrow WW^{(*)}\rightarrow \ell\nu\ell\nu$ channels, the observation of a Higgs-like particle is established at 6.0 standard deviations level. With more data accumulated during LHC Run~1, the measurements of Higgs boson couplings and mass in the $H\to\gamma\gamma$ channel are conducted by the ATLAS experiment based on 4.5~$\rm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s}=7~\rm{TeV}$ collected in 2011, and 20.3~$\rm{fb}^{-1}$ at $\sqrt{s}=8~\rm{TeV}$ collected in 2012. The combined signal strength, defined as number of observed Higgs boson decays to diphoton divided by the corresponding Standard Model prediction, is measured to be $1.17 \ ^{+0.28}_{-0.26}$ assuming the Higgs boson mass being 125.4~$\rm{GeV}$. The signal strengths for individual Higgs boson production processes are also measured, and are found to be in good consistency with the Standard Model. The mass of the Higgs boson is measured in $H\to\gamma\gamma$ channel by the ATLAS experiment to be $125.98 \pm 0.50$~\GeV. This measurement is combined with the ones from ATLAS $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$ as well as CMS $H\to\gamma\gamma$ and $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$. The Higgs boson mass measured from the combination is $125.09\pm0.24~\rm{GeV}$. With LHC center-of-mass energy increased to 13~TeV, a search for high mass Beyond the Standard Model scalar resonance is performed in the diphoton decay channel based on 15.4~$\rm{fb}^{-1}$ of proton-proton collision data collected by the ATLAS detector during 2015 and 2016. While a notable wide excess was first observed in the diphoton invariant mass spectrum from the 2015 data (3.2~$\rm{fb}^{-1}$) with mass near 750~GeV, it is not confirmed by the 2016 data with much higher statistics (12.4~$\rm{fb}^{-1}$). Limits on the production cross section times branching ratio of such resonances are set.