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Heavy Higgs Boson Search In The Four Lepton Decay Channel With The Atlas Detector
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Book Synopsis Heavy Higgs Boson Search in the Four Lepton Decay Channel with the ATLAS Detector by : Denys Denysiuk
Download or read book Heavy Higgs Boson Search in the Four Lepton Decay Channel with the ATLAS Detector written by Denys Denysiuk and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis is focused on the heavy Higgs boson search in four lepton decay channelwith Run-2 data from the ATLAS detector at the Large Hadron Collider. The analysis publishedat ICHEP 2016 conference that is based on 14.8 fb-1 of 13 TeV data is described in details, whilethe updated results that include 36.1 fb-1 of 13 TeV data are shown as well. The heavy Higgssearch is carried out in a model independent way and it is covering different signal widthhypotheses: narrow width approximation that assumes the signal natural width to be negligiblecomparing to the detector resolution, and the large width assumption including an effect of theinterference with the Standard Model backgrounds. The search that benefits from additionalkinematic discriminant under the scalar signal assumption is presented as well. Thismodification allows to increase the analysis sensitivity up to 25%.The thesis also discusses an upgrade of the ATLAS Muons Spectrometer, namely the NewSmall Wheel project. In particular, simulation of the cavern background that will affect theupgraded detector and commissioning of the Micromegas modules produced at CEA-Saclay forthe New Small Wheel are described.
Book Synopsis Search for the Higgs Boson Decaying to Four Leptons in the ATLAS Detector at LHC and Studies of Muon Isolation and Energy Loss by : Bruno Lenzi
Download or read book Search for the Higgs Boson Decaying to Four Leptons in the ATLAS Detector at LHC and Studies of Muon Isolation and Energy Loss written by Bruno Lenzi and published by . This book was released on 2010 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The central subject of this thesis is the evaluation of the discovery potential of the Higgs boson through its decay into four leptons (electrons and muons) in the ATLAS experiment installed at the Large Hadron Collider (LHC). The LHC was designed to accelerate proton beams at a center of mass energy of 14~TeV and started its physics program with 7~TeV collisions in the beginning of 2010. An inclusive analysis involving all tle production modes and an exclusive one aiming at production through vector boson fusion (VBF), studied for the first time in the collaboration are presented. Both are capable of discovering the Higgs boson after a few years of LHC operation, with integrated luminosities of 30~fb[dollar]^{-1}[dollar]. The first one covers most part of a Higgs mass window from 130 to 500~GeV. The second one concentrates on masses around 180~GeV and above, exploiting ftle presence of high energy jets with large separations in pseudo-rapidity to increase the signal over background ratio. An important part of the document is devoted to the reconstruction of muon isolation and energy loss in the ATLAS calorimeters. A software package that optimized the way of treating the energy deposits was developed and tested on simulated data and cosmic-ray events, leading ta improvements in the muon momentum resolution and the distinction between muons from heavy quark and vector boson decays. As a consequence of the last result one of the dominant backgrounds to the [dollar]H \to 4\mu[dollar] channel, [dollar]Z\bbar[dollar], is expected to be reduced by almost a factor of two.
Book Synopsis Measurement of the Higgs Boson Production and Couplings in the Four-lepton Decay Channel with the ATLAS Detector by : Stefano Zambito
Download or read book Measurement of the Higgs Boson Production and Couplings in the Four-lepton Decay Channel with the ATLAS Detector written by Stefano Zambito and published by . This book was released on 2015 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Higgs Boson Decaying to Four Leptons in the ATLAS Detector at LHC Leading to the Observation of a New Particle Compatible with the Higgs Boson by : Meng Xiao
Download or read book Search for the Higgs Boson Decaying to Four Leptons in the ATLAS Detector at LHC Leading to the Observation of a New Particle Compatible with the Higgs Boson written by Meng Xiao and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Beauty and the Boost: A Higgs Boson Tale by : Brian Moser
Download or read book The Beauty and the Boost: A Higgs Boson Tale written by Brian Moser and published by Springer Nature. This book was released on 2023-09-19 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision measurements of the Higgs boson’s properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.
Book Synopsis Discovery and Measurement of the Higgs Boson in the WW Decay Channel by : David Hall
Download or read book Discovery and Measurement of the Higgs Boson in the WW Decay Channel written by David Hall and published by Springer. This book was released on 2015-06-15 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for Higgs Boson Decays to Beyond-the-Standard-Model Light Bosons in Four-lepton Events with the ATLAS Detector at the LHC. by : Justin Chiu
Download or read book Search for Higgs Boson Decays to Beyond-the-Standard-Model Light Bosons in Four-lepton Events with the ATLAS Detector at the LHC. written by Justin Chiu and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the search for the dark sector process h -> Zd Zd -> 4l in events collected by the ATLAS detector at the Large Hadron Collider in 2015--2018. In this theorized process, the Standard Model Higgs boson (h) decays to four leptons via two intermediate Beyond-the-Standard-Model particles each called Zd. This process arises from interactions of the Standard Model with a dark sector. A dark sector consists of one or more new particles that have limited or zero interaction with the Standard Model, such as the new vector boson Zd (dark photon). It could have a rich and interesting phenomenology like the visible sector (the Standard Model) and could naturally address many outstanding problems in particle physics. For example, it could contain a particle candidate for dark matter. In particular, Higgs decays to Beyond-the-Standard-Model particles are well-motivated theoretically and are not tightly constrained; current measurements of Standard Model Higgs properties permit the fraction of such decays to be as high as approximately 30%. The results of this search do not show evidence for the existence of the h -> Zd Zd -> 4l process and are therefore interpreted in terms of upper limits on the branching ratio B(h -> Zd Zd) and the effective Higgs mixing parameter kappa^prime.
Book Synopsis Search for Lepton-flavour-violating H 2![mu][tau] Decays of the Higgs Boson with the ATLAS Detector by :
Download or read book Search for Lepton-flavour-violating H 2![mu][tau] Decays of the Higgs Boson with the ATLAS Detector written by and published by . This book was released on 2015 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct search for lepton-flavour-violating H → [mu][tau] decays of the recently discovered Higgs boson with the ATLAS detector at the LHC is presented. The analysis is performed in the H → [mu][tau] had channel, where [tau] had is a hadronically decaying [tau] -lepton. The search is based on the data sample of proton-proton collisions collected by the ATLAS experiment corresponding to an integrated luminosity of 20.3 fb-1 at a centre-of-mass energy of √s = 8 TeV. No statistically significant excess of data over the predicted background is observed. As a result, the observed (expected) 95% confidence-level upper limit on the branching fraction, Br( H → [mu][tau] ), is 1.85% (1.24%).
Book Synopsis 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 by :
Download or read book 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 published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electron Reconstruction and Performance Studies, Search for a Heavy Higgs Boson Decaying to Four-leptons Using the ATLAS Detector, Irradiations at the Birmingham Irradiation Facility for the HL-LHC. by : Kerry Ann Parker
Download or read book Electron Reconstruction and Performance Studies, Search for a Heavy Higgs Boson Decaying to Four-leptons Using the ATLAS Detector, Irradiations at the Birmingham Irradiation Facility for the HL-LHC. written by Kerry Ann Parker and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Displaced Leptons in the ATLAS Detector by : Lesya Horyn
Download or read book A Search for Displaced Leptons in the ATLAS Detector written by Lesya Horyn and published by Springer Nature. This book was released on 2022-02-07 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).
Book Synopsis The Standard Model Higgs Boson by : Martin B. Einhorn
Download or read book The Standard Model Higgs Boson written by Martin B. Einhorn and published by North Holland. This book was released on 1991 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 8.
Book Synopsis The Search for a Heavy Higgs Boson in the H W W Lνjj Channel with the ATLAS Detector by : Ossama Sherif Alexander AbouZeid
Download or read book The Search for a Heavy Higgs Boson in the H W W Lνjj Channel with the ATLAS Detector written by Ossama Sherif Alexander AbouZeid and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Lepton-flavour Violating Decays of the Higgs Boson with the ATLAS Detector by : Katharina Schleicher
Download or read book Search for Lepton-flavour Violating Decays of the Higgs Boson with the ATLAS Detector written by Katharina Schleicher and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Searching for Heavy Higgs Bosons Using Events with Leptons and Missing Transverse Momentum with the ATLAS Detector by : Fang-Ying Tsai
Download or read book Searching for Heavy Higgs Bosons Using Events with Leptons and Missing Transverse Momentum with the ATLAS Detector written by Fang-Ying Tsai and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for a Light Charged Higgs Boson in the Decay Channel H + --> C ̄s Using the ATLAS Detector by : Omran Trifis
Download or read book Search for a Light Charged Higgs Boson in the Decay Channel H + --> C ̄s Using the ATLAS Detector written by Omran Trifis and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson Production and Decay to W Boson Pairs Using the Lepton + Met + Jets Channel Using 4.7 Fb−1 of Data Recorded by the ATLAS Detector at √s by : Dilip Kumar Jana
Download or read book Search for the Standard Model Higgs Boson Production and Decay to W Boson Pairs Using the Lepton + Met + Jets Channel Using 4.7 Fb−1 of Data Recorded by the ATLAS Detector at √s written by Dilip Kumar Jana and published by . This book was released on 2013 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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