Identification Of B Jets And Investigation Of The Discovery Potential Of A Higgs Boson In The Wh L Bb Wh L Nu B B Channel With The Atlas Experiment
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Identification Of B Jets And Investigation Of The Discovery Potential Of A Higgs Boson In The Wh L Bb Wh L Nu B B Channel With The Atlas Experiment
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Author : Nicola Giacinto Piacquadio
language : en
Publisher:
Release Date : 2009
Identification Of B Jets And Investigation Of The Discovery Potential Of A Higgs Boson In The Wh L Bb Wh L Nu B B Channel With The Atlas Experiment written by Nicola Giacinto Piacquadio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
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 The Higgs Boson In The Wh Lvbb Channel With The Atlas Detector
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Author : Kazuya Mochizuki
language : en
Publisher:
Release Date : 2015
Search For The Higgs Boson In The Wh Lvbb Channel With The Atlas Detector written by Kazuya Mochizuki 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.
In July 2012, the ATLAS and CMS collaborations announced the discovery of a new particle at a mass of about 125 GeV, compatible with the Higgs boson predicted by the Standard Model (SM) ofparticle physics. Although all measurements as of Summer 2015 show a full consistency with the SM predictions, the H->bb decay channel has not been seen yet as clearly as the other decay channels. This thesis presents a search for the Higgs boson in the WH->lvbb channel, using proton-proton collision data at sqrt(s) = 8 TeV taken with the ATLAS detector in the year 2012, corresponding to an integrated luminosity of 20.3 fb-1. This document details in particular one of the contributions made by the author in this search: the additional analysis region with muon events triggered by missing transverse momentum. An excess over the background-only hypothesis has been found with a significance of 1.8 sigma while 1.5 sigma was expected. The observed (expected) upper limit on the cross-section times branching ratio for WH->lvbb at 95% confidence level is found to be 2.35 (1.37) times the SM prediction at mH = 125 GeV. This search highly relies on the identification of jets originating in b-quark fragmentation, so-called b-tagging. In order to improve the H->bb search and other physics analyses using b-tagging in ATLAS, the development of high performance b-tagging algorithms has been performed and is presented also in this thesis. A new b-tagging algorithm, called MV2, is introduced: it improves the b-tagging performance significantly and is now the baseline b-tagging algorithm in ATLAS for the Run-2 analyses.
Investigation Of The Discovery Potential Of A Higgs Boson In The Tt H0 H0 Rightarrow Bb Channel With The Atlas Experiment
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Author :
language : en
Publisher:
Release Date : 2010
Investigation Of The Discovery Potential Of A Higgs Boson In The Tt H0 H0 Rightarrow Bb Channel With 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 2010 with categories.
Discovery And Measurement Of The Higgs Boson In The Ww Decay Channel
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Author : David Hall
language : en
Publisher: Springer
Release Date : 2015-06-15
Discovery And Measurement Of The Higgs Boson In The Ww Decay Channel written by David Hall and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-15 with Science categories.
This thesis describes the stand-alone discovery and measurement of the Higgs boson in its decays to two W bosons using the Run-I ATLAS dataset. This is the most precise measurement of gluon-fusion Higgs boson production and is among the most significant results attained at the LHC. The thesis provides an exceptionally clear exposition on a complicated analysis performed by a large team of researchers. Aspects of the analysis performed by the author are explained in detail; these include new methods for evaluating uncertainties on the jet binning used in the analysis and for estimating the background due to associated production of a W boson and an off-shell photon. The thesis also describes a measurement of the WW cross section, an essential background to Higgs boson production. The primary motivation of the LHC was to prove or disprove the existence of the Higgs boson. In 2012, CERN announced this discovery and the resultant ATLAS publication contained three decay channels: gg, ZZ, and WW.
Search For A Light Higgs Boson In The Channel Wh E Nu E B Anti B
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Author : David Meder-Marouelli
language : en
Publisher:
Release Date : 2005
Search For A Light Higgs Boson In The Channel Wh E Nu E B Anti B written by David Meder-Marouelli 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.
Search For The Sm Higgs Boson In The Channel Wh L Bb Wh 1 Nu Bb With The Atlas Experiment At The Lhc
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Author : Jonas Zacharias Will
language : en
Publisher:
Release Date : 2012
Search For The Sm Higgs Boson In The Channel Wh L Bb Wh 1 Nu Bb With The Atlas Experiment At The Lhc written by Jonas Zacharias Will 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.
Study Of A Highly Boosted Higgs Boson Decaying To B Jets Final States With The Atlas Experiment At Cern
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Author : Maria Giovanna Foti
language : en
Publisher:
Release Date : 2021
Study Of A Highly Boosted Higgs Boson Decaying To B Jets Final States With The Atlas Experiment At Cern written by Maria Giovanna Foti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 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 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.
Constraints On Higgs Boson Production With Large Transverse Momentum Using H Bb Decays In The Atlas Detector
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Constraints On Higgs Boson Production With Large Transverse Momentum Using H Bb Decays In The Atlas Detector written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: This paper reports constraints on Higgs boson production with transverse momentum above 1 TeV. The analyzed data from proton-proton collisions at a center-of-mass energy of 13 TeV were recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018 and correspond to an integrated luminosity of 136 fb−1. Higgs bosons decaying into b ̄b are reconstructed as single large-radius jets recoiling against a hadronic system and are identified by the experimental signature of two b-hadron decays. The experimental techniques are validated in the same kinematic regime using the Z→b ̄b process. The 95% confidence-level upper limit on the cross section for Higgs boson production with transverse momentum above 450 GeV is 115 fb, and above 1 TeV it is 9.6 fb. The Standard Model cross section predictions for a Higgs boson with a mass of 125 GeV in the same kinematic regions are 18.4 fb and 0.13 fb, respectively