Measurements Of Higgs Boson Production By Gluon Gluon Fusion And Vector Boson Fusion Using H Ww E Nu Mu Nu Decays In Pp Collisions At Square Root S

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Measurements Of Higgs Boson Production By Gluon Gluon Fusion And Vector Boson Fusion Using H Ww E Nu Mu Nu Decays In Pp Collisions At Square Root S

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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022

Measurements Of Higgs Boson Production By Gluon Gluon Fusion And Vector Boson Fusion Using H Ww E Nu Mu Nu Decays In Pp Collisions At Square Root S written by 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.

Measurements Of Gluon Gluon Fusion And Vector Boson Fusion Higgs Boson Production Cross Sections In The H Ww E Ny My Ny Decay Channel In Pp Collisions At Square Root S

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Author : Anne Kathrin Becker
language : en
Publisher:
Release Date : 2019

Measurements Of Gluon Gluon Fusion And Vector Boson Fusion Higgs Boson Production Cross Sections In The H Ww E Ny My Ny Decay Channel In Pp Collisions At Square Root S written by Anne Kathrin Becker 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.

Measurement Of Higgs Boson Production Via Gluon Fusion And Vector Boson Fusion In The H Ww Decay Mode With The Atlas Experiment At The Lhc At Square Root S

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Author : Ralf Gugel
language : en
Publisher:
Release Date : 2019

Measurement Of Higgs Boson Production Via Gluon Fusion And Vector Boson Fusion In The H Ww Decay Mode With The Atlas Experiment At The Lhc At Square Root S written by Ralf Gugel 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.

Abstract: On the 4 th of July 2012 the observation of a new neutral particle was announced by the ATLAS [1] and CMS [2] Collaborations. This particle is by now generally considered as the Higgs boson H predicted [3, 4] in the Standard Model of particle physics. Its mass of m H = 125.09 ± 0.24 GeV [5] implies a rich set of final states which allow for experimental studies in regards to this particle and searches for deviations from the properties predicted by the Standard Model. In this thesis a measurement of the gluon-fusion and vector-boson fusion production cross sections times H→WW* branching ratio is presented using final states with one electron and one muon. The measurement is based on proton- proton collisions with an integrated luminosity of 36.1 fb -1 √ recorded with the ATLAS detector at the CERN Large Hadron Collider ( LHC ) at s = 13 TeV in 2015 and 2016. Signal-like events are selected in categories with different jet multiplicities. The results are extracted by means of a binned maximum-likelihood fit. To this end, either distributions in multiple discriminant variables or the response of a multivariate classifier are used depending on the category. The results are found to be well compatible with the Standard Model predictions. This analysis is extrapolated to estimate the future precision of such a measurement at the end of the High-Luminosity LHC programme [6]. This extrapolated analysis is combined with analogously extrapolated analyses targeting other production and decay modes of the Higgs boson. Based on this combination the expected precision is determined for future measurements of couplings between the Higgs boson and other particles. Thereby an estimation is given for the anticipated sensitivity of these analyses to signs of physics beyond the Standard Model. In addition studies are presented to identify sources of electron charge misidentification in the reconstruction algorithms employed in the ATLAS Collaboration.

Measurement Of Higgs Boson Production Via Gluon Fusion And Vector Boson Fusion In The H Ww Decay Mode With The Atlas Experiment At The Lhc At Square Root S

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Author : Ralf Gugel
language : en
Publisher:
Release Date : 2019

Measurement Of Higgs Boson Production Via Gluon Fusion And Vector Boson Fusion In The H Ww Decay Mode With The Atlas Experiment At The Lhc At Square Root S written by Ralf Gugel 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.

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.

Measurements Of The Higgs Boson Production And Decay Rates And Constraints On Its Couplings From A Combined Atlas And Cms Analysis Of The Lhc Pp Collision Data At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2016

Measurements Of The Higgs Boson Production And Decay Rates And Constraints On Its Couplings From A Combined Atlas And Cms Analysis Of The Lhc Pp Collision Data 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.

Combined ATLAS and CMS measurements of the Higgs boson production and decay rates, as well as constraints on its couplings to vector bosons and fermions, are presented. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a W or a Z boson or a pair of top quarks, and of the six decay modes H → ZZ, W W , ??, ??, bb, and ??. All results are reported assuming a value of 125.09 GeV for the Higgs boson mass, the result of the combined measurement by the ATLAS and CMS experiments. The analysis uses the CERN LHC proton-proton collision data recorded by the ATLAS and CMS experiments in 2011 and 2012, corresponding to integrated luminosities per experiment of approximately 5 fb${̂–1}$ at $ sqrt{s}=7 $ TeV and 20 fb${̂–1}$ at $ sqrt{s}=8 $ TeV. The Higgs boson production and decay rates measured by the two experiments are combined within the context of three generic parameterisations: two based on cross sections and branching fractions, and one on ratios of coupling modifiers. Several interpretations of the measurements with more model-dependent parameterisations are also given. The combined signal yield relative to the Standard Model prediction is measured to be 1.09 ± 0.11. The combined measurements lead to observed significances for the vector boson fusion production process and for the H → ?? decay of 5.4 and 5.5 standard deviations, respectively. In conclusion, the data are consistent with the Standard Model predictions for all parameterisations considered.

Measurement Of Higgs Boson Production Via Gluon Fusion In The H Ww Decay Channel With The Cms Experiment

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Author : Adrián Álvarez Fernández
language : en
Publisher:
Release Date : 2021

Measurement Of Higgs Boson Production Via Gluon Fusion In The H Ww Decay Channel With The Cms Experiment written by Adrián Álvarez Fernández 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.

This thesis reports measurements of the Higgs boson production in proton-proton collisions at a centre-of-mass energy of 13 TeV with data collected by the CMS experiment during the Run 2 operation period (2016-2018) of the Large Hadron Collider at CERN. The measurement is performed using a sample of event candidates to originate from the decay of a Higgs boson into a pair of W bosons, which then decay into a charged lepton and a neutrino resulting in a nal state with two charged leptons of dierent avour. The thesis focuses on the study of the Higgs boson production through the gluon fusion process, which is the most favoured one at a centre-of-mass energy of 13 TeV...

Observation Of The Higgs Boson Decaying To Ww To Leptons And Neutrinos

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Author : Nikolina Ilic
language : en
Publisher:
Release Date : 2015

Observation Of The Higgs Boson Decaying To Ww To Leptons And Neutrinos written by Nikolina Ilic 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.

Measurements Of Higgs Boson Production And Couplings In The Four Lepton Channel In Pp Collisions At Center Of Mass Energies Of 7 And 8 Tev With The Atlas Detector

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Author :
language : en
Publisher:
Release Date : 2015

Measurements Of Higgs Boson Production And Couplings In The Four Lepton Channel In Pp Collisions At Center Of Mass Energies Of 7 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.

Precision Coupling Measurements Of The Higgs Boson Using The H Zz 4l Decay Channel

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Author : Syed Haider Abidi
language : en
Publisher:
Release Date : 2020

Precision Coupling Measurements Of The Higgs Boson Using The H Zz 4l Decay Channel written by Syed Haider Abidi 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.

The coupling of the Higgs boson to other particles is probed by measuring the production cross sections at the Large Hadron Collider using the ATLAS detector. The present measurement is performed using the H->ZZ*->4l decay channel, with l= electron or muon and with datasets corresponding to various integrated luminosities. The inclusive production cross section is measured to be 1.34 +/- 0.12 pb, which is in good agreement with the predicted value of 1.33 +/- 0.08 pb. The gluon-gluon fusion, the vector boson fusion, the vector boson associated and the top associated production cross sections are measured to be 1.12 +/- 0.12 pb, 110 +/- 40 fb, 75 +61 -49 fb and 27 +26 -17 fb, respectively. The differential production cross sections are also measured using the Simplified Template cross sections framework. All measurements are in good agreement with the Standard Model predictions. These results are used to measure the Higgs boson coupling to fermions and vector bosons using the kappa-framework and to derive constraints on contributions from beyond the Standard Model physics using an effective field theory approach. No significant deviations from the Standard Model are observed.