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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
Kind : eBook
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.

Search for Higgs Boson Decays in the H2!W+W- 2!vlv Channel Via Vector Boson Fusion with the ATLAS Detector at the LHC

2014
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Release : 2014
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Book Synopsis Search for Higgs Boson Decays in the H2!W+W- 2!vlv Channel Via Vector Boson Fusion with the ATLAS Detector at the LHC by : Bonnie Kar Bo Chow

Download or read book Search for Higgs Boson Decays in the H2!W+W- 2!vlv Channel Via Vector Boson Fusion with the ATLAS Detector at the LHC written by Bonnie Kar Bo Chow. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt:

A Beauty-ful Boson

2023-01-01 Science
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Release : 2023-01-01
Genre : Science
Kind : eBook
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.

Evidence for the Production of the Standard Model Higgs Boson Produced Via Vector Boson Fusion in the WW* Channel at the ATLAS Detector

2017
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Release : 2017
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Book Synopsis Evidence for the Production of the Standard Model Higgs Boson Produced Via Vector Boson Fusion in the WW* Channel at the ATLAS Detector by : Koos van Nieuwkoop

Download or read book Evidence for the Production of the Standard Model Higgs Boson Produced Via Vector Boson Fusion in the WW* Channel at the ATLAS Detector written by Koos van Nieuwkoop. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt: In 2012, the ATLAS and CMS experiments at CERN's Large Hadron Collider announced they had each observed a new particle with a mass of about 125 GeV/c^2. Given the available data, the properties of this particle are consistent with the Higgs boson predicted by the Standard Model of particle physics (SM). The Higgs boson, as proposed within the SM, is the simplest manifestation of the Brout-Englert-Higgs mechanism. This discovery was driven by the gluon fusion (ggF) production mode, the dominant Higgs boson production mechanism at the LHC. The SM also predicts that the Higgs boson can be produced by the fusion of two weak vector bosons (VBF). Measuring VBF Higgs boson production is an important test of the SM but it is challenging to measure given its cross section is an order of magnitude smaller than that of ggF. After H->bb, H->WW* is the dominant decay channel for the SM Higgs boson at 125 GeV/c^2 and is therefore a promising channel to measure its properties. In addition, the VBF H->WW* search channel makes it possible to probe the exclusive coupling of the Higgs boson to the weak vector bosons. Precise measurements of these coupling strengths make it possible to constrain new models of physics beyond the SM. Despite its relatively large branching ratio, H->WW*->lnln is a challenging channel to search for the Higgs boson because of the neutrinos in the final state which are not directly detectable by the ATLAS detector. Consequently, it is not possible to fully reconstruct the mass of the WW system. Furthermore, there are several backgrounds that have the same signature in the detector as the signal. Top quark pair production is the largest background in this analysis. A multivariate analysis technique, based on an eight-variable boosted decision tree (BDT), is used to search for VBF H->WW*->lnln in the Run-I data and a subset of the Run-II data. This analysis provides the first evidence for VBF H->WW*->lnln with a significance of 3.2 standard deviations in Run-I and 1.9 standard deviations in Run-II. The measured signal strength relative to the rate predicted by the SM for VBF H->WW*->lnln is 1.3 +/- 0.5 using the Run-I data, and 1.7 +1.1/-0.9 using a fraction of the Run-II data.

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.

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