A Search For The Standard Model Higgs Boson Produced In Association With Dileptonically Decaying Top Quarks And Decaying Into A Pair Of Bottom Quarks With The Atlas Detector
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A Search For The Standard Model Higgs Boson Produced In Association With Dileptonically Decaying Top Quarks And Decaying Into A Pair Of Bottom Quarks With The Atlas Detector
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Author : Callum Kilby
language : en
Publisher:
Release Date : 2019
A Search For The Standard Model Higgs Boson Produced In Association With Dileptonically Decaying Top Quarks And Decaying Into A Pair Of Bottom Quarks With The Atlas Detector written by Callum Kilby 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.
Higgs Boson Decays Into A Pair Of Bottom Quarks
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Author : Cecilia Tosciri
language : en
Publisher: Springer Nature
Release Date : 2021-10-22
Higgs Boson Decays Into A Pair Of Bottom Quarks written by Cecilia Tosciri and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-22 with Science categories.
The discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. However, despite its experimental success, the SM is known to be only an effective manifestation of a more fundamental description of nature. The scientific research at the LHC is strongly focused on extending the SM by searching, directly or indirectly, for indications of New Physics. The extensive physics program requires increasingly advanced computational and algorithmic techniques. In the last decades, Machine Learning (ML) methods have made a prominent appearance in the field of particle physics, and promise to address many challenges faced by the LHC. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of 79.8/fb collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of 13 TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other \Hbb searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is 1.01 +- 0.12 (stat.)+ 0.16-0.15(syst.). The 'observation' analysis was further extended to provide a finer interpretation of the V H(H → bb) signal measurement. The cross sections for the VH production times the H → bb branching ratio have been measured in exclusive regions of phase space. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. The results of the cross-section measurements, as well as the constraining of the operators that affect the couplings of the Higgs boson to the vector boson and the bottom quarks, have been documented and discussed in this thesis. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. Such techniques constitute a branch of ML and include clustering and indexing methods that enable quick and efficient searches for vectors similar to each other. The new simulation approach provides optimal results in terms of detector resolution response and reduces the computational requirements of a standard particles simulation.
Search For The Standard Model Higgs Boson Produced In Association With Top Quarks And Decaying Into A B B Pair In P P Collisions At S
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Author : Felix Bührer
language : en
Publisher:
Release Date : 2018
Search For The Standard Model Higgs Boson Produced In Association With Top Quarks And Decaying Into A B B Pair In P P Collisions At S written by Felix Bührer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Search For The Production Of A Standard Model Higgs Boson In Association With Top Quarks And Decaying Into A Pair Of Bottom Quarks With 13 Tev Atlas Data
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Author : Nedaa Alexandra Asbah
language : en
Publisher:
Release Date : 2018
Search For The Production Of A Standard Model Higgs Boson In Association With Top Quarks And Decaying Into A Pair Of Bottom Quarks With 13 Tev Atlas Data written by Nedaa Alexandra Asbah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Search For A Standard Model Higgs Boson Produced In Association With A Top Quark Pair And Decaying To Bottom Quarks Using A Matrix Element Method
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Author :
language : en
Publisher:
Release Date : 2015
Search For A Standard Model Higgs Boson Produced In Association With A Top Quark Pair And Decaying To Bottom Quarks Using A Matrix Element Method 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.
Search For The Standard Model Higgs Boson Decaying Into B Overline B Produced In Association With Top Quarks Decaying Hadronically In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For The Standard Model Higgs Boson Decaying Into B Overline B Produced In Association With Top Quarks Decaying Hadronically 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 2016 with categories.
In this paper, a search for Higgs boson production in association with a pair of top quarks ($ t\overline{t} $H) is performed, where the Higgs boson decays to $ b\overline{b} $ , and both top quarks decay hadronically. The data used correspond to an integrated luminosity of 20.3 fb -1 of pp collisions at √s = 8 TeV collected with the ATLAS detector at the Large Hadron Collider. The search selects events with at least six energetic jets and uses a boosted decision tree algorithm to discriminate between signal and Standard Model background. The dominant multijet background is estimated using a dedicated data-driven technique. For a Higgs boson mass of 125 GeV, an upper limit of 6.4 (5.4) times the Standard Model cross section is observed (expected) at 95% confidence level. The best-fit value for the signal strength is [mu] = 1.6 ± 2.6 times the Standard Model expectation for mH = 125 GeV. Combining all $ t\overline{t}$H searches carried out by ATLAS at √s = 8 and 7 TeV, an observed (expected) upper limit of 3.1 (1.4) times the Standard Model expectation is obtained at 95% confidence level, with a signal strength [mu] = 1.7 ± 0.8.
Search For The Standard Model Higgs Boson Produced In Association With A Pair Of Top Quarks And Decaying Into A Bb Pair In The Single Lepton Channel At S
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Author : Matteo Mantoani
language : it
Publisher:
Release Date : 2017
Search For The Standard Model Higgs Boson Produced In Association With A Pair Of Top Quarks And Decaying Into A Bb Pair In The Single Lepton Channel At S written by Matteo Mantoani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
This thesis presents a search for Standard Model Higgs boson produced in association with top quark pairs, ttH. The analysis uses 13.2 fb-1 of pp collision data at √s = 13 TeV collected in 2015 and 2016 with the ATLAS detector at the LHC. The considered decay mode for the Higgs boson is H->bb and the single lepton decay channel (electron or muon) for the tt pair. The sensitivity of this channel is improved by an event categorisation according to the jet multiplicity and the number of jets containing a b-hadron decay. Multivariate techniques are used to distinguish the signa...
Search For The Standard Model Higgs Boson Produced In Association With A Pair Of Top Quarks And Decaying Into A Bb Pair In The Single Lepton Channel At S
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Author : Leonid Serkin
language : en
Publisher:
Release Date : 2016
Search For The Standard Model Higgs Boson Produced In Association With A Pair Of Top Quarks And Decaying Into A Bb Pair In The Single Lepton Channel At S written by Leonid Serkin 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 The Standard Model Higgs Boson Produced In Association With A Pair Of Top Quarks And Decaying Into A Bb Pair In The Single Lepton Channel At Sqrt S
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Author : Leonid Serkin
language : en
Publisher:
Release Date : 2016
Search For The Standard Model Higgs Boson Produced In Association With A Pair Of Top Quarks And Decaying Into A Bb Pair In The Single Lepton Channel At Sqrt S written by Leonid Serkin 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.
This thesis focuses on the search for the Standard Model Higgs boson produced in association with a pair of top quarks, ttH, using 20.3 fb-1 of pp collision data at sqrt{s} = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H -> bb decay mode and is performed in the single lepton channel, characterised by an isolated electron or muon, missing transverse energy and at least four jets. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities into nine analys...
Search For The Standard Model Higgs Boson Decaying To A Bottom Quark Pair With The Cms Detector
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Author : Matthew I. Fisher
language : en
Publisher:
Release Date : 2014
Search For The Standard Model Higgs Boson Decaying To A Bottom Quark Pair With The Cms Detector written by Matthew I. Fisher 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.
A search for the standard model Higgs boson is shown in the associated production channel with a Z boson and decay to bottom quarks. The data for this search was gathered from April 2011 until December 2012. The dataset corresponds to 5.0 fb ... 1 of pp collisions at p s = 7 TeV and 19.04 fb ... 1 of pp collisions at p s = 8 TeV . An excess of events is observed above the expected background with a local significance of 2.1 standard deviations, which is consistent with the expectation from the production of the standard model Higgs boson.