Measurement Of Higgs Boson Production Cross Sections And Test Of Cp Invariance In Vector Boson Fusion Production In The H Lep Had Decay Mode With The Atlas Detector

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Measurement Of Higgs Boson Production Cross Sections And Test Of Cp Invariance In Vector Boson Fusion Production In The H Lep Had Decay Mode With The Atlas Detector

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Author : Dirk Sammel
language : en
Publisher:
Release Date : 2020

Measurement Of Higgs Boson Production Cross Sections And Test Of Cp Invariance In Vector Boson Fusion Production In The H Lep Had Decay Mode With The Atlas Detector written by Dirk Sammel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

Measurement Of Higgs Boson Production Cross Sections And Test Of Cp Invariance In Vector Boson Fusion Production In The H Lep Had Decay Mode With The Atlas Detector

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Author : Dirk Sammel
language : en
Publisher:
Release Date : 2020

Measurement Of Higgs Boson Production Cross Sections And Test Of Cp Invariance In Vector Boson Fusion Production In The H Lep Had Decay Mode With The Atlas Detector written by Dirk Sammel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Measurement categories.

Abstract: This thesis presents a measurement of the Higgs-boson production cross-section and a test of CP invariance in vector-boson fusion production in the semileptonic final state of the H->tau tau decay channel. Both analyses use proton-proton collision data corresponding to an integrated luminosity of 36.1 fb^-1 recorded with the ATLAS detector at a center-of-mass energy of 13 TeV. The events are divided into categories that target the specific kinematics of the gluon fusion- and the vector-boson fusion production processes of the Higgs boson. A maximum-likelihood fit in the reconstructed di-tau mass is performed to extract the H->tau tau cross-section. A signal excess with an observed significance of 2.4 standard deviations is found under the background-only hypothesis, whereas the expected significance is 2.6 standard deviations. The resulting H->tau tau cross-section is 3.13 +1.53/-1.33 pb, which is in agreement with the prediction by the Standard Model. In combination with the fully leptonic- and fully hadronic final states of the H->tau tau decay channel, the resulting cross-section is 3.77 +1.06/-0.95 pb, which is again consistent with the prediction by the Standard Model. The obtained observed significance is 4.4 standard deviations with an expected significance of 4.1 standard deviations. Further combination with the result of the search for the H->tau tau decay with data recorded at center-of-mass energies of 7 and 8 TeV yields an observed significance of 6.4 standard deviation with an expected significance of 5.4 standard deviations. To test CP invariance in the coupling between the Higgs boson and the electroweak gauge bosons, the production of the Higgs boson via vector-boson fusion is studied. This production process is separated from other processes by using a machine learning approach in form of Boosted Decision Trees. An Effective Field Theory approach is used to expand the Lagrangian of the Standard Model with additional CP-odd terms, quantified by the parameter dtilde. Maximum-likelihood fits are performed in the CP-odd Optimal Observable to set constraints on dtilde. The observed confidence interval at 68.3% confidence level is [-0.006,0.089], whereas the expected confidence interval is [-0.064,0.065]. The combination with the fully leptonic- and fully hadronic final states of the H->tau tau decay channel yields an observed 68.3% confidence interval of [-0.090,0.035] with an expected confidence interval of [-0.035,0.033]. In the combination, also an expected confidence interval at 95% confidence level of [-0.21,015] is obtained. All the results are in agreement with dtilde=0 as predicted by the Standard Model

Measurement Of The Higgs Boson Production Cross Section And Test Of Cp Invariance In Vector Boson Fusion Production With H Decays In The Fully Leptonic Final State With The Atlas Detector At The Lhc

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Author : Alena Lösle
language : en
Publisher:
Release Date : 2020

Measurement Of The Higgs Boson Production Cross Section And Test Of Cp Invariance In Vector Boson Fusion Production With H Decays In The Fully Leptonic Final State With The Atlas Detector At The Lhc written by Alena Lösle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson Using The Optimal Observable Method In The Ditau Decay Channel With The Atlas Detector

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Author : Hannah Arnold
language : en
Publisher:
Release Date : 2016

Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson Using The Optimal Observable Method In The Ditau Decay Channel With The Atlas Detector written by Hannah Arnold 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.

Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson Using The Optimal Observable Method In The Di Tau Decay Channel With The Atlas Detector

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Author : Martin Spangenberg (Researcher in particle physics)
language : en
Publisher:
Release Date : 2016

Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson Using The Optimal Observable Method In The Di Tau Decay Channel With The Atlas Detector written by Martin Spangenberg (Researcher in particle physics) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Higgs bosons categories.

Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson In The H Tau Tau Channel In Proton Proton Collisions At S

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2020

Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson In The H Tau Tau Channel In Proton Proton Collisions At S 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 2020 with categories.

Abstract: A test of CP invariance in Higgs boson production via vector-boson fusion is performed in the decay channel. This test uses the Optimal Observable method and is carried out using of proton-proton collision data collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak gauge bosons are described by an effective field theory, in which the parameter governs the strength of CP violation. No sign of CP violation is observed in the distributions of the Optimal Observable, and is constrained to the interval [−0.090, 0.035] at the 68% confidence level (CL), compared to an expected interval of based upon the Standard Model prediction. No constraints can be set on at 95% CL, while an expected 95% CL interval of for the Standard Model hypothesis was expected

Search For The Standard Model Higgs Boson And Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson In The Fully Leptonic H T T L L 4v Final State In Proton Proton Collisions With The Atlas Detector At The Lhc

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Author : Christian Schillo
language : en
Publisher:
Release Date : 2016

Search For The Standard Model Higgs Boson And Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson In The Fully Leptonic H T T L L 4v Final State In Proton Proton Collisions With The Atlas Detector At The Lhc written by Christian Schillo 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.

Fiducial And Differential Cross Section Measurements For The Vector Boson Fusion Production Of The Higgs Boson In The H Ww E Decay Channel At 13 Tev With The Atlas Detector

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2023

Fiducial And Differential Cross Section Measurements For The Vector Boson Fusion Production Of The Higgs Boson In The H Ww E Decay Channel At 13 Tev With 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 2023 with categories.

Measurement Of The Higgs Boson Properties Using Its Decay To A Pair Of Tau Leptons In Proton Proton Collisions At S

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Author : Doyeong Kim
language : en
Publisher:
Release Date : 2022

Measurement Of The Higgs Boson Properties Using Its Decay To A Pair Of Tau Leptons In Proton Proton Collisions At S written by Doyeong Kim 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.

The Compact Muon Solenoid (CMS) detector has successfully operated with the Large Hadron Collider (LHC) collisions since 2010, leading to the Higgs boson discovery in 2012 by the CMS and ATLAS collaborations. The analyses of data taken during Run 2 (2016-2018) has already led to many interesting results about the properties of the Higgs boson and for the most part they are compatible in the context of the standard model (SM) so far. These studies are important because the SM appears to be an approximation of a more general theory. Precise studies of the Higgs boson's interactions with the known matter and force particles are essential to reveal the microscopic deviations from the SM prediction. One of such interactions is Yukawa couplings of the Higgs boson and fermions. The H → [tau tau] decay is the most sensitive fermionic decay mode that allows direct probing of this interaction. This thesis presents a study of the Higgs boson properties by observing its decay to a pair of tau leptons and testing evidence of non-SM interactions in the Higgs boson production. The results exploit the data collected by the CMS detector during LHC Run-2, in proton-proton collisions with a center-of-mass energy of 13 TeV. Firstly, the Higgs bosons' properties were explored by two complementary approaches by measuring its cross sections. Thanks to the observation of the H → [tau tau] decay in 2016, we can measure the total cross section with higher precision. Furthermore, in the first analysis, the cross sections of different Higgs productions were scrutinized using fine selections within each Higgs production mode which are mutually exclusive using the Simplified Template Cross Section (STXS) framework, proposed by the LHC Higgs Cross Section Working Group. In the second analysis, the first-ever measurement of the inclusive and differential fiducial cross sections for the Higgs boson production decaying to a pair of tau leptons was presented. In the third analysis, a search for anomalous couplings in the Higgs production vertex, including Charge-Parity (CP) violating couplings, is also performed targeting Higgs boson production via gluon fusion in association with two jets and vector boson fusion. None of these analyses has found any hint of new physics beyond the SM, but stringent limits on anomalous Higgs boson couplings to data were set and cross sections of the Higgs bosons in smaller phase spaces were precisely measured.

Precision Measurements Of Higgs Boson Production In Decays To W Bosons Using Machine Learning With The Atlas Experiment

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Author : Benjamin Jäger
language : en
Publisher:
Release Date : 2022

Precision Measurements Of Higgs Boson Production In Decays To W Bosons Using Machine Learning With The Atlas Experiment written by Benjamin Jäger 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.

The Higgs boson is a unique tool in the search for the fundamental laws of nature, as it is connected to many of the open fundamental questions the Standard Model (SM) of particle physics cannot answer. Precision measurements of the properties of the Higgs boson, including its interactions with other fundamental particles, provide a powerful tool to test the predictions of the SM and possibly find deviations from them. As part of a broad Higgs boson physics program at the Large Hadron Collider (LHC), this thesis presents cross-section measurements of Higgs boson production via gluon fusion (ggF) and vector-boson fusion (VBF) in decays to W bosons. The H -> WW* decay is the second most likely decay of the Higgs boson and, in the VBF production mode, the most sensitive channel to measure the coupling of the Higgs boson to vector bosons at the LHC. The measurement is based on pp collisions at a center-of-mass energy of \sqrt{s} = 13 TeV recorded by the ATLAS experiment at the LHC between 2015 and 2018, corresponding to an integrated luminosity of 139 / fb. The measurements of the inclusive ggF and VBF cross sections times branching fraction result in 12.0 +-1.4 pb and 0.75 +0.19 -0.16 pb, respectively. In addition, Higgs boson production is measured in 11 exclusive kinematic regions. All results are found to be consistent with their corresponding SM predictions. The H -> WW* analysis is also an important input to combined Higgs boson measurements, which provide some of the most precise measurements of Higgs boson interactions to date and are briefly summarized in this work. The measurement of the VBF, H -> WW* process is drastically improved over previous results by the implementation of a binary classifier based on a deep neural network (DNN) that distinguishes the VBF, H -> WW* signal from other physical processes. The development and optimization of the DNN are presented in this thesis. This thesis also presents the measurement of the jet energy resolution, which is essential for many physics analyses performed with the ATLAS experiment, such as the H -> WW* analysis, due to the abundance of jets in pp collisions.