Measurement Of Higgs Boson Production In Association With A Vector Boson And Decay To B Quarks In The Simplified Template Cross Section Framework And Interpretations With The Standard Model Effective Field Theory
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Author | : Aliya Nigamova |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : |
ISBN | : |
Download Measurement of Higgs Boson Production in Association with a Vector Boson and Decay to B-quarks in the Simplified Template Cross Section Framework and Interpretations with the Standard Model Effective Field Theory Book in PDF, Epub and Kindle
Author | : Hessamoddin Kaveh |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
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Download Simplified Template Cross-section Measurement for Higgs Boson Decay to B-Quarks in Association with a Vector Boson with the Full Run 2 CMS Dataset Book in PDF, Epub and Kindle
Author | : Cecilia Tosciri |
Publisher | : Springer Nature |
Total Pages | : 171 |
Release | : 2021-10-22 |
Genre | : Science |
ISBN | : 3030879380 |
Download Higgs Boson Decays into a Pair of Bottom Quarks Book in PDF, Epub and Kindle
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.
Author | : Simona Gargiulo |
Publisher | : |
Total Pages | : 0 |
Release | : 2021 |
Genre | : Measurement |
ISBN | : |
Download Measurement of the Higgs Boson Decay to a Pair of B-quarks in the Associated Production with a Vector Boson with the ATLAS Detector Book in PDF, Epub and Kindle
Author | : ATLAS Collaboration CERN |
Publisher | : |
Total Pages | : 0 |
Release | : 2021 |
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Download Measurement of the Associated Production of a Higgs Boson Decaying Into B-quarks with a Vector Boson at High Transverse Momentum in Pp Collisions at [square Root]s Book in PDF, Epub and Kindle
Abstract: The associated production of a Higgs boson with a W or Z boson decaying into leptons and where the Higgs boson decays to a pair is measured in the high vector-boson transverse momentum regime, above 250 GeV, with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of , were collected in proton-proton collisions at the Large Hadron Collider between 2015 and 2018 at a centre-of-mass energy of . The measured signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model, is corresponding to an observed (expected) significance of 2.1 (2.7) standard deviations. Cross-sections of associated production of a Higgs boson decaying into b quark pairs with a W or Z gauge boson, decaying into leptons, are measured in two exclusive vector boson transverse momentum regions, 250-400 GeV and above 400 GeV, and interpreted as constraints on anomalous couplings in the framework of a Standard Model effective field theory
Author | : David Hall |
Publisher | : Springer |
Total Pages | : 175 |
Release | : 2015-06-15 |
Genre | : Science |
ISBN | : 3319199897 |
Download Discovery and Measurement of the Higgs Boson in the WW Decay Channel Book in PDF, Epub and Kindle
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.
Author | : Luca Ambroz |
Publisher | : |
Total Pages | : |
Release | : 2020 |
Genre | : |
ISBN | : |
Download Measurements of the Associated Production of a Higgs Boson Decaying Into Two Beauty Quarks with a Weak Vector Boson Book in PDF, Epub and Kindle
Author | : Michael David Planer |
Publisher | : |
Total Pages | : 149 |
Release | : 2018 |
Genre | : |
ISBN | : |
Download Measurement of the Higgs Boson Cross-section and Couplings in the Two Photon Decay Channel Book in PDF, Epub and Kindle
Author | : [Study Group] ATLAS Collaboration CERN |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : |
ISBN | : |
Download Measurement of Higgs Boson Decay Into B-quarks in Associated Production with a Top-quark Pair in Pp Collisions at [square Root]s Book in PDF, Epub and Kindle
Abstract: The associated production of a Higgs boson and a top-quark pair is measured in events characterised by the presence of one or two electrons or muons. The Higgs boson decay into a b-quark pair is used. The analysed data, corresponding to an integrated luminosity of 139 fb−1, were collected in proton-proton collisions at the Large Hadron Collider between 2015 and 2018 at a centre-of-mass energy of s√ = 13 TeV. The measured signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model, is 0.35+0.36−0.34. This result is compatible with the Standard Model prediction and corresponds to an observed (expected) significance of 1.0 (2.7) standard deviations. The signal strength is also measured differentially in bins of the Higgs boson transverse momentum in the simplified template cross-section framework, including a bin for specially selected boosted Higgs bosons with transverse momentum above 300 GeV
Author | : Johanna Bronner |
Publisher | : |
Total Pages | : 214 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Measurement of Higgs Boson Production Via Vector Boson Fusion in Decays Into W Bosons with the ATLAS Detector Book in PDF, Epub and Kindle