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Search For A Standard Model Higgs Boson In Cms Via Vector Boson Fusion In The H Ww L Nu L Nu Channel
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Book Synopsis Search for a Standard Model Higgs Boson in CMS Via Vector Boson Fusion in the H ---] WW ---] L Nu L Nu Channel by :
Download or read book Search for a Standard Model Higgs Boson in CMS Via Vector Boson Fusion in the H ---] WW ---] L Nu L Nu Channel written by and published by . This book was released on 2007 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the potential for discovering the Standard Model Higgs boson produced by the vector-boson fusion mechanism. We considered the decay of Higgs bosons into the WW− final state, with both W-bosons subsequently decaying leptonically. The main background is t{bar t} with one or more jets produced. This study is based on a full simulation of the CMS detector, and up-to-date reconstruction codes. The result is that a signal of 5[sigma] significance can be obtained with an integrated luminosity of 12 - 72 fb−1 for Higgs boson masses between 130
Book Synopsis Search for the Standard Model Higgs Boson in the H → ZZ → l + l - qq Decay Channel at CMS by : Francesco Pandolfi
Download or read book Search for the Standard Model Higgs Boson in the H → ZZ → l + l - qq Decay Channel at CMS written by Francesco Pandolfi and published by Springer Science & Business Media. This book was released on 2013-08-15 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theoretical foundations of the Standard Model of elementary particles relies on the existence of the Higgs boson, a particle which has been revealed for the first time by the experiments run at the Large Hadron Collider (LHC) in 2012. As the Higgs boson is an unstable particle, its search strategies were based on its decay products. In this thesis, Francesco Pandolfi conducted a search for the Higgs boson in the H → ZZ → l + l - qq Decay Channel with 4.6 fb -1 of 7 TeV proton-proton collision data collected by the Compact Muon Solenoid (CMS) experiment. The presence of jets in the final state poses a series of challenges to the experimenter: both from a technical point of view, as jets are complex objects and necessitate of ad-hoc reconstruction techniques, and from an analytical one, as backgrounds with jets are copious at hadron colliders, therefore analyses must obtain high degrees of background rejection in order to achieve competitive sensitivity. This is accomplished by following two directives: the use of an angular likelihood discriminant, capable of discriminating events likely to originate from the decay of a scalar boson from non-resonant backgrounds, and by using jet parton flavor tagging, selecting jets compatible with quark hadronization and discarding jets more likely to be initiated by gluons. The events passing the selection requirements in 4.6 fb -1 of data collected by the CMS detector are examined, in the search of a possible signal compatible with the decay of a heavy Higgs boson. The thesis describes the statistical tools and the results of this analysis. This work is a paradigm for studies of the Higgs boson with final states with jets. The non-expert physicists will enjoy a complete and eminently readable description of a proton-proton collider analysis. At the same time, the expert reader will learn the details of the searches done with jets at CMS.
Book Synopsis Search for the Standard Model Higgs Boson Produced Through Vector Boson Fusion and Decaying to $\mathrm{b\bar{b}}$ by :
Download or read book Search for the Standard Model Higgs Boson Produced Through Vector Boson Fusion and Decaying to $\mathrm{b\bar{b}}$ written by and published by . This book was released on 2015 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A first search is reported for a standard model Higgs boson (H) that is produced through vector boson fusion and decays to a bottom-quark pair. Two data samples, corresponding to integrated luminosities of 19.8 fb-1 and 18.3 fb-1 of proton-proton collisions at [arrow]"=8 TeV were selected for this channel at the CERN LHC. The observed significance in these data samples for a H2!\mathrm{b\bar{b}}$ signal at a mass of 125 GeV is 2.2 standard deviations, while the expected significance is 0.8 standard deviations. The fitted signal strength [mu]=[sigma]/[sigma]SM=2.8+1.6-1.4. The combination of this result with other CMS searches for the Higgs boson decaying to a b-quark pair yields a signal strength of 1.0"0.4, corresponding to a signal significance of 2.6 standard deviations for a Higgs boson mass of 125 GeV.
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 and published by . This book was released on 2017 with total page 145 pages. 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.
Book Synopsis Search for the Standard Model Higgs Boson in the H ZZ L + L - Qq Decay Channel at CMS by : Francesco Pandolfi
Download or read book Search for the Standard Model Higgs Boson in the H ZZ L + L - Qq Decay Channel at CMS written by Francesco Pandolfi and published by . This book was released on 2013-09-30 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson Produced Via Vector Boson Fusion and Decaying to Bottom Quarks with the CMS Detector at the Large Hadron Collider by : Sara Alderweireldt
Download or read book Search for the Standard Model Higgs Boson Produced Via Vector Boson Fusion and Decaying to Bottom Quarks with the CMS Detector at the Large Hadron Collider written by Sara Alderweireldt and published by . This book was released on 2016 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with a Standard W Or a Z Boson and Decaying to Bottom Quarks by :
Download or read book Search for the Standard Model Higgs Boson Produced in Association with a Standard W Or a Z Boson and Decaying to Bottom Quarks written by and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson (H) decaying to b b-bar when produced in association with a weak vector boson (V) is reported for the following channels: W(mu nu)H, W(e nu)H, W(tau nu)H, Z(mu mu)H, Z(e e)H, and Z(nu nu)H. The search is performed in data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns at sqrt(s) = 7 TeV and up to 18.9 inverse femtobarns at sqrt(s) = 8 TeV, recorded by the CMS experiment at the LHC. An excess of events is observed above the expected background with a local significance of 2.1 standard deviations for a Higgs boson mass of 125 GeV, consistent with the expectation from the production of the standard model Higgs boson. The signal strength corresponding to this excess, relative to that of the standard model Higgs boson, is 1.0 +/- 0.5./abstract
Book Synopsis Observation of a New State in the Search for the Higgs Boson at CMS by : Giovanni Petrucciani
Download or read book Observation of a New State in the Search for the Higgs Boson at CMS written by Giovanni Petrucciani and published by Springer. This book was released on 2014-12-04 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the searches that lead to the discovery of a Higgs boson performed at CMS, one of the two main experiments at the CERN LHC. After an overview of the theory and of the CMS experiment, all search channels are described, with emphasis on the ones with the best sensitivity. The statistical methodology used to analyse and the outcomes of the searches and the discovery results are then presented in detail.
Book Synopsis Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-boson Fusion Production of the Higgs Boson in the Fully Leptonic H->t+t--> L+l-4v Final State in Proton-proton Collisions with the ATLAS Detector at the LHC by : Christian Schillo
Download or read book Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-boson Fusion Production of the Higgs Boson in the Fully Leptonic H->t+t--> L+l-4v Final State in Proton-proton Collisions with the ATLAS Detector at the LHC written by Christian Schillo and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson in E[tau] Final States by :
Download or read book Search for the Standard Model Higgs Boson in E[tau] Final States written by and published by . This book was released on 2013 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented in this dissertation is a search for the standard model (SM) Higgs boson using the DØ detector at Fermilab in Batavia, IL. The SM is a fantastically accurate theory describing the fundamental interactions and particles of the Universe. The only undiscovered particle in the SM is the Higgs boson, which is hypothesized to be responsible for electroweak symmetry breaking and giving mass to all other particles. Considered in this search is the process H + X → e[tau]hjj, where e is an electron, [tau]h is the hadronic decay of a tau, and j is a jet, using p $\bar{p}$ collisions at center of mass energy√s = 1.96 TeV. This search includes three production modes: associated production, gluon fusion and vector boson fusion. It also utilizes two decay channels: H→ [tau][tau] and H → WW. A new technique, dubbed the Global Boosted Decision Tree, is introduced which offers a means of providing continuity to a multivariate search as a function of a particular parameter, in this case, the mass of the Higgs boson. The observed (expected) limit on the ratio of cross section times branching fraction to the SM at 95% confidence level is 14.6 (16.0) at mH = 125 GeV. This result is combined with the related channel H + X → [mu][tau]hjj and produced an observed (expected) limit of 9.0 (11.3) at mH = 125 GeV.
Book Synopsis Search for the Standard Model Higgs Boson in the H -] WW -] Lepton+neutrino+q'qbar Decay Channel by :
Download or read book Search for the Standard Model Higgs Boson in the H -] WW -] Lepton+neutrino+q'qbar Decay Channel written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the standard model Higgs boson (H) in ppbar collisions at sqrt{s}=1.96 TeV in events containing a charged lepton (ell), missing transverse energy, and at least two jets, using 5.4 fb-̂1 of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. This analysis is sensitive primarily to Higgs bosons produced through the fusion of two gluons or two electroweak bosons, with subsequent decay H->WW->ell+nu+q'qbar, where ell is an electron or muon. The search is also sensitive to contributions from other production channels, such as WH->ell+nu+bbbar In the absence of signal, we set limits at the 95% C.L. on the cross section for H production sigma(ppbar->H+X) in these final states. For a mass of MH=160 GeV, the limit is a factor of 3.9 larger than the cross section in the standard model, and consistent with expectation.
Book Synopsis Search for the Standard Model Higgs Boson in E[tau] Final States by : Ian James Howley
Download or read book Search for the Standard Model Higgs Boson in E[tau] Final States written by Ian James Howley and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented in this dissertation is a search for the standard model (SM) Higgs boson using the D[zero] detector at Fermilab in Batavia, IL. The SM is a fantastically accurate theory describing the fundamental interactions and particles of the Universe. The only undiscovered particle in the SM is the Higgs boson, which is hypothesized to be responsible for electroweak symmetry breaking and giving mass to all other particles. Considered in this search is the process H + X -> e[tau]hjj, where e is an electron, [tau]h is the hadronic decay of a [tau], and j is a jet, using p[p-bar] collisions at center of mass energy s−1 = 1.96 TeV. This search includes three production modes: associated production, gluon fusion and vector boson fusion. It also utilizes two decay channels: H -> [tau][tau] and H -> WW. A new technique, dubbed the Global Boosted Decision Tree, is introduced which offers a means of providing continuity to a multivariate search as a function of a particular parameter, in this case, the mass of the Higgs boson. The observed (expected) limit on the ratio of cross section times branching fraction to the SM at 95% confidence level is 14.6 (16.0) at mH = 125 GeV. This result is combined with the related channel H + X -> [mu][tau]hjj and produced an observed (expected) limit of 9.0 (11.3) at mH = 125 GeV.
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 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 and published by . This book was released on 2016 with total page 169 pages. 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.
Book Synopsis First Search for the Standard Model Higgs Boson Using the Semileptonic Decay Channel by :
Download or read book First Search for the Standard Model Higgs Boson Using the Semileptonic Decay Channel written by and published by . This book was released on 2010 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the first search for the standard model Higgs boson (H) in decay topologies containing a muon, an imbalance in transverse momentum (E{sub T}) and jets, using p{bar p} collisions at √s = 1.96 TeV with an integrated luminosity of 4.3 fb−1 recorded with the D0 detector at the Fermilab Tevatron Collider. This analysis is sensitive primary to contributions from Higgs bosons produced through gluon fusion, with subsequent decay H → WW → [mu][nu]jj where W represents a real or virtual W boson. In the absence of signal, limits are set at 95% confidence on the production and decay of the standard model Higgs boson for M{sub H} in the range of 115-200 GeV. For M{sub H} = 165 GeV, the observed and expected limits are factors of 11.2 larger than the standard model value. Combining this channel with e[nu]jj final states and including earlier data to increase the integrated luminosity to 5.4 fb−1 produces observed(expected) limits of 5.5(3.8) times the standard model value.
Book Synopsis The God Particle by : Leon M. Lederman
Download or read book The God Particle written by Leon M. Lederman and published by Houghton Mifflin Harcourt. This book was released on 2006 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fascinating tour of particle physics from Nobel Prize winner Leon Lederman. At the root of particle physics is an invincible sense of curiosity. Leon Lederman embraces this spirit of inquiry as he moves from the Greeks' earliest scientific observations to Einstein and beyond to chart this unique arm of scientific study. His survey concludes with the Higgs boson, nicknamed the God Particle, which scientists hypothesize will help unlock the last secrets of the subatomic universe, quarks and all--it's the dogged pursuit of this almost mystical entity that inspires Lederman's witty and accessible history.
Book Synopsis Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-Boson Fusion Production of the Higgs Boson in the Fully Leptonic H->tautau->ll4nu Final State in Proton-Proton Collisions with the ATLAS Detector at the LHC by : Christian Schillo
Download or read book Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-Boson Fusion Production of the Higgs Boson in the Fully Leptonic H->tautau->ll4nu Final State in Proton-Proton Collisions with the ATLAS Detector at the LHC written by Christian Schillo and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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