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Search for the Higgs Boson in the Process H 2!ZZ 2!llv Produced Via Vector-boson Fusion with the ATLAS Detector

2012
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Release : 2012
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Book Synopsis Search for the Higgs Boson in the Process H 2!ZZ 2!llv Produced Via Vector-boson Fusion with the ATLAS Detector by : Clive Andrew Edwards

Download or read book Search for the Higgs Boson in the Process H 2!ZZ 2!llv Produced Via Vector-boson Fusion with the ATLAS Detector written by Clive Andrew Edwards. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: The search potential of a Standard Model Higgs boson in the Vector Boson Fusion production mechanism with Higgs boson decaying to two leptons and two neutrinos via decay to two Z bosons with the ATLAS detector is investigated. The ATLAS detector is a general purpose detector in operation at CERN measuring proton-proton collisions produced by the Large Hadron Collider. This channel has been shown to have high sensitivity at large Higgs mass, where large amounts of missing energy in the signal provide good discrimination over expected backgrounds. This work takes a first look at whether the sensitivity of this channel may be improved using the remnants of the vector boson fusion process to pro- vide extra discrimination, particularly at lower mass where sensitivity of the main analysis is reduced because of lower missing energy. Simulated data samples at centre of mass energy 7 Te V are used to derive signal significances over the mass range between 200-600 Ge V / c2. Because of varying signal properties with mass, a low and a high mass event selection were developed and optimized. A comparison between simulated and real data (collected in 2010) is made of variables used in the analysis and the effect of pileup levels corresponding to those in the 2010 data is investigated. Possible methods to estimate some of the main backgrounds to this search are described and discussed. The impact • of important theoretical and detector related systematics are taken into account. Final results are presented in the form of 95 % Confidence Level exclusion limits on the signal cross section relative to the SM prediction as a function of Higgs boson mass, based on an integrated luminosity of 33.4 pb -1 of data collected during 2010.

Search for the Higgs boson in the process H→ZZ→llνν produced via vector-Boson fusion with the ATLAS detector

2012
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Release : 2012
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Book Synopsis Search for the Higgs boson in the process H→ZZ→llνν produced via vector-Boson fusion with the ATLAS detector by : Clive Edwards

Download or read book Search for the Higgs boson in the process H→ZZ→llνν produced via vector-Boson fusion with the ATLAS detector written by Clive Edwards. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt:

Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector

2015-01-20 Science
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Release : 2015-01-20
Genre : Science
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Book Rating : 996/5 ( reviews)

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Book Synopsis Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector by : Eric Ouellette

Download or read book Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector written by Eric Ouellette. This book was released on 2015-01-20. Available in PDF, EPUB and Kindle. Book excerpt: This Thesis describes the first measurement of, and constraints on, Higgs boson production in the vector boson fusion mode, where the Higgs decays to b quarks (the most common decay channel), at the LHC. The vector boson fusion mode, in which the Higgs is produced simultaneously with a pair of quark jets, provides an unparalleled opportunity to study the detailed properties of the Higgs, including the possibility of parity and CP violation, as well as its couplings and mass. It thus opens up this new field of study for precision investigation as the LHC increases in energy and intensity, leading the way to this new and exciting arena of precision Higgs research.

A Beauty-ful Boson

2023-01-01 Science
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Release : 2023-01-01
Genre : Science
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Book Rating : 136/5 ( reviews)

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Book Synopsis A Beauty-ful Boson by : Giulia Di Gregorio

Download or read book A Beauty-ful Boson written by Giulia Di Gregorio. This book was released on 2023-01-01. Available in PDF, EPUB and Kindle. Book excerpt: The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.

A Search for Higgs Boson Production Via Vector Boson Fusion in Association with a Photon in the H & Rarr ; B B Channel with the Atlas Detector

2016
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Release : 2016
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Book Rating : 838/5 ( reviews)

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Book Synopsis A Search for Higgs Boson Production Via Vector Boson Fusion in Association with a Photon in the H & Rarr ; B B Channel with the Atlas Detector by : Peyton Wells Rose

Download or read book A Search for Higgs Boson Production Via Vector Boson Fusion in Association with a Photon in the H & Rarr ; B B Channel with the Atlas Detector written by Peyton Wells Rose. This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: A search for the Standard Model Higgs boson produced via vector boson fusion in association with a photon and decaying to a bottom quark-antiquark pair has been conducted using 12.6 fb--1 of proton-proton collision data collected by the ATLAS detector at a center-of-mass energy [sqrt] s =13TeV at the LHC in 2015 and 2016. The search benefits from a large reduction of the non-resonant multijet background relative to similar searches that do not explicitly require a photon and from efficient triggering aided by the presence of the photon. Multivariate techniques trained using simulated Monte Carlo samples are used to enhance the sensitivity of the analysis by constructing regions of phase space with higher expected signal fractions relative to the background. Data-driven techniques are used in those regions to provide a reliable estimate of the di-b-jet invariant mass spectrum of the non-resonant background. The final statistical analysis of the data relies on a profile likelihood fit to the di-b-jet invariant mass distribution, searching for a signal bump in an otherwise smoothly falling distribution. There is no observed excess above the background-only expectation, and the observed (expected) 95% confidence level upper limit on the production cross section times branching ratio for a Higgs boson mass of 125 GeV is 4.0 (6.0+2.3--1.7) times the Standard Model expectation. The observed signal strength is --3.9 +2.8--2.7 times the Standard Model value. This analysis is also sensitive to Z + gamma production: the observed (expected) upper limit is 2.0 (1.8+0.7-0.5) times the Standard Model expectation with an observed signal strength of 0.3+/-0.8.

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