Search For The Higgs Boson In The Process H 2 Zz 2 Llv Produced Via Vector Boson Fusion With The Atlas Detector
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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
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Author : Clive Andrew Edwards
language : en
Publisher:
Release Date : 2012
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 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
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.
Deep Inelastic Scattering
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Author : Masahiro Kuze
language : en
Publisher: World Scientific
Release Date : 2007
Deep Inelastic Scattering written by Masahiro Kuze and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Science categories.
These proceedings present the most up-to-date status of deep inelastic scattering (DIS) physics. Topics such as structure function measurements and phenomenology, quantum chromodynamics (QCD) studies in DIS and photoproduction, spin physics and diffractive interactions are reviewed in detail, with emphasis on those studies that push the test of QCD and the Standard Model to the limits of their present range of validity, towards both the very high and the very low four-momentum transfers in leptonproton scattering.
Supersymmetry And The Unification Of Fundamental Interactions
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Author : Deog Ki Hong
language : en
Publisher: American Institute of Physics
Release Date : 2008-12-11
Supersymmetry And The Unification Of Fundamental Interactions written by Deog Ki Hong and has been published by American Institute of Physics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-12-11 with Science categories.
This annual SUSY conference has become the world's largest international meeting devolted to new ideas in high energy physics. The main subject of the conference is theoretical and phenomenological aspects of supersymmetric theories, and dark matter and dark energy, and other comological connections. New, interesting results from various experimental groups are increasingly presented at the conference as well. With roughly 200 plenary and parallel presentations, SUSY08 will likely deliver energy and enthusiasm of both theorists and experimentalists who are searching the frontier of high energy physics.
Ifae 2005
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Author : Alessia Tricomi
language : en
Publisher: American Institute of Physics
Release Date : 2005-10-20
Ifae 2005 written by Alessia Tricomi and has been published by American Institute of Physics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-10-20 with Science categories.
All papers in these proceedings are in English. IFAE is an annual conference on high energy physics. Distinguished scientists discuss relevant topics of particle physics, cosmic ray and neutrino physics, as well as detector and accelerator technologies. Topics included are: the standard model, SUSY and beyond the standard model, heavy flavor physics, neutrinos and cosmic rays, as well as detectors and new technologies.
Ifae
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Author :
language : en
Publisher:
Release Date : 2005
Ifae written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Cosmic rays categories.
Sixth International Conference Of The Balkan Physical Union
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Author : Balkan Physical Union. International Conference
language : en
Publisher: American Institute of Physics
Release Date : 2007-05-15
Sixth International Conference Of The Balkan Physical Union written by Balkan Physical Union. International Conference and has been published by American Institute of Physics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-15 with Science categories.
This book contains the proceedings of the Sixth International Conference of the Balkan Physical Union (BPU-6), held in Istanbul, Turkey, in August 2006. The BPU-6 Conference covers the most important results and trends in physics, including: Nuclear physics and nuclear energy, gravitation and cosmology, alternative sources of energy, econophysics, biophysics and medical physics, history of philosophy of physics, meteorology and instrumentation.
Search For The Higgs Boson In The Process H Zz Ll Produced Via Vector Boson Fusion With The Atlas Detector
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Author : Clive Edwards
language : en
Publisher:
Release Date : 2012
Search For The Higgs Boson In The Process H Zz Ll Produced Via Vector Boson Fusion With The Atlas Detector written by Clive Edwards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Search For The Higgs Boson In The Vector Boson Fusion Channel At The Atlas Detector
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Author : Eric Ouellette
language : en
Publisher: Springer
Release Date : 2015-01-20
Search For The Higgs Boson In The Vector Boson Fusion Channel At The Atlas Detector written by Eric Ouellette and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-01-20 with Science categories.
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.
Evidence For The Production Of The Standard Model Higgs Boson Produced Via Vector Boson Fusion In The Ww Channel At The Atlas Detector
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Author : Koos van Nieuwkoop
language : en
Publisher:
Release Date : 2017
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 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
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.
A Beauty Ful Boson
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Author : Giulia Di Gregorio
language : en
Publisher: Springer Nature
Release Date : 2023-01-01
A Beauty Ful Boson written by Giulia Di Gregorio and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-01 with Science categories.
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.