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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Atlas Measurements Of The Higgs Boson Coupling To The Top Quark In The Higgs To Diphoton Decay Channel
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Author : Jennet Elizabeth Dickinson
language : en
Publisher: Springer Nature
Release Date : 2021-11-16
Atlas Measurements Of The Higgs Boson Coupling To The Top Quark In The Higgs To Diphoton Decay Channel written by Jennet Elizabeth Dickinson and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-11-16 with Science categories.
During Run 2 of the Large Hadron Collider, the ATLAS experiment recorded proton-proton collision events at 13 TeV, the highest energy ever achieved in a collider. Analysis of this dataset has provided new opportunities for precision measurements of the Higgs boson, including its interaction with the top quark. The Higgs-top coupling can be directly probed through the production of a Higgs boson in association with a top-antitop quark pair (ttH). The Higgs to diphoton decay channel is among the most sensitive for ttH measurements due to the excellent diphoton mass resolution of the ATLAS detector and the clean signature of this decay. Event selection criteria were developed using novel Machine Learning techniques to target ttH events, yielding a precise measurement of the ttH cross section in the diphoton channel and a 6.3 $\sigma$ observation of the ttH process in combination with other decay channels, as well as stringent limits on CP violation in the Higgs-top coupling.
A Boson Learned From Its Context And A Boson Learned From Its End
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Author : Jeffrey Roskes
language : en
Publisher: Springer Nature
Release Date : 2020-11-19
A Boson Learned From Its Context And A Boson Learned From Its End written by Jeffrey Roskes and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-19 with Science categories.
This thesis develops fundamental ideas and advanced techniques for studying the Higgs boson’s interactions with the known matter and force particles. The Higgs boson appears as an excitation of the Higgs field, which permeates the vacuum. Several other phenomena in our Universe, such as dark energy, dark matter, and the abundance of matter over antimatter, remain unexplained. The Higgs field may prove to be the connection between our known world and the “dark” world, and studies of the Higgs boson's interactions are essential to reveal possible new phenomena. The unique feature of this work is simultaneous measurement of the Higgs boson’s associated production (its context, to use the language of the title) and its decay (its end), while allowing for multiple parameters sensitive to new phenomena. This includes computer simulation with Monte Carlo techniques of the complicated structure of the Higgs boson interactions, the matrix-element calculation of per-event likelihoods for optimal observables, and advanced fitting methods with hundreds of intricate components that cover all possible parameters and quantum mechanical interference. This culminates in the most advanced analysis of LHC data in the multi-parameter approach to Higgs physics in its single golden four-lepton decay channel to date. Optimization of the CMS detector’s silicon-based tracking system, essential for these measurements, is also described.
Search For Tt H Production In The H Bb Decay Channel
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Author : Marcel Rieger
language : en
Publisher: Springer Nature
Release Date : 2021-02-25
Search For Tt H Production In The H Bb Decay Channel written by Marcel Rieger and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-25 with Science categories.
In 1964, a mechanism explaining the origin of particle masses was proposed by Robert Brout, François Englert, and Peter W. Higgs. 48 years later, in 2012, the so-called Higgs boson was discovered in proton-proton collisions recorded by experiments at the LHC. Since then, its ability to interact with quarks remained experimentally unconfirmed. This book presents a search for Higgs bosons produced in association with top quarks tt̄H in data recorded with the CMS detector in 2016. It focuses on Higgs boson decays into bottom quarks H → bb̅ and top quark pair decays involving at least one lepton. In this analysis, a multiclass classification approach using deep learning techniques was applied for the first time. In light of the dominant background contribution from tt̄ production, the developed method proved to achieve superior sensitivity with respect to existing techniques. In combination with searches in different decay channels, the presented work contributed to the first observations of tt̄H production and H → bb̅ decays.
The Standard Theory Of Particle Physics
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Author : Luciano Maiani
language : en
Publisher: World Scientific Publishing Company
Release Date : 2016-08-25
The Standard Theory Of Particle Physics written by Luciano Maiani and has been published by World Scientific Publishing Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-25 with Science categories.
The book gives a quite complete and up-to-date picture of the Standard Theory with an historical perspective, with a collection of articles written by some of the protagonists of present particle physics. The theoretical developments are described together with the most up-to-date experimental tests, including the discovery of the Higgs Boson and the measurement of its mass as well as the most precise measurements of the top mass, giving the reader a complete description of our present understanding of particle physics.
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
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.
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.