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Search For The Standard Model Higgs Boson In Leptons Plus Jets Final States
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Book Synopsis Search for the Standard Model Higgs Boson in Leptons Plus Jets Final States by :
Download or read book Search for the Standard Model Higgs Boson in Leptons Plus Jets Final States written by and published by . This book was released on 2014 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches for SM Higgs boson production in the leptons plus jets final states with a data set corresponding to 9.7 fb-1 of $\bar{p}$p collisions at √s = 1.96TeV collected by the DØ Experiment are presented in this thesis. The searches are carried out in two independent analyses, accounting for different signal topologies.
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton Plus Jets Channel by : Sean C. Flowers
Download or read book Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton Plus Jets Channel written by Sean C. Flowers and published by . This book was released on 2017 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results for the search of a Higgs boson decaying to a bottom quark-antiquark pair produced with a top quark-antiquark pair (t ̄tH) in the lepton plus jets channel in proton-proton collisions at a center-of-mass energy of √ s = 13 TeV are presented. The data used corresponds to an integrated luminosity of 12.9 fb−1 recorded with the CMS experiment in 2016. To increase the sensitivity of the search, selected events are categorized by number of jets and number of b-tagged jets resulting in different expected signal and background rates. For each category two multivariate techniques are combined to separate the signal and background events. A machine learning process called a boosted decision tree (BDT) is trained on the two types of classes of events and then split into high and low purity based on the output. The physics motivated matrix element method (MEM) is applied to the BDT output to obtain the final two dimensional discriminator. The result is presented in terms of the t ̄tH signal strength modifier μ, the ratio of the observed t ̄tH production cross section relative to the expected cross section based on a 125 GeV Standard Model Higgs boson. A combined fit of the final discriminant in all categories of the lepton plus jets channel results an observed (expected) upper limit of μ
Book Synopsis Search for the Higgs Boson in Lepton, Tau, and Jets Final States by :
Download or read book Search for the Higgs Boson in Lepton, Tau, and Jets Final States written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with two or more jets using 9.7 fb-1 of Run II Fermilab Tevatron Collider data collected with the D0 detector. The analysis is sensitive to Higgs boson production via gluon fusion, associated vector boson production, and vector boson fusion, followed by the Higgs boson decay to tau lepton pairs or to W boson pairs. The ratios of 95% C.L. upper limits on the cross section times branching ratio to those predicted by the standard model are obtained for orthogonal subsamples that are enriched in either H → [tau] [tau] decays or H → WW decays, and for the combination of these subsample limits. The observed and expected limit ratios for the combined subsamples at a Higgs boson mass of 125 GeV are 11.3 and 9.0 respectively.
Book Synopsis A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton + Jets Channel at CMS by : Geoffrey N. Smith
Download or read book A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton + Jets Channel at CMS written by Geoffrey N. Smith and published by . This book was released on 2014 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson in Tau Lepton Final States by :
Download or read book Search for the Standard Model Higgs Boson in Tau Lepton Final States written by and published by . This book was released on 2012 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with zero, one, or two or more jets using data corresponding to an integrated luminosity of up to 7.3 fb−1 collected with the D0 detector at the Fermilab Tevatron collider. The analysis is sensitive to Higgs boson production via gluon gluon fusion, associated vector boson production, and vector boson fusion, and to Higgs boson decays to tau lepton pairs or W boson pairs. Observed (expected) limits are set on the ratio of 95% C.L. upper limits on the cross section times branching ratio, relative to those predicted by the Standard Model, of 14 (22) at a Higgs boson mass of 115 GeV and 7.7 (6.8) at 165 GeV.
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with Top Quarks by :
Download or read book Search for the Standard Model Higgs Boson Produced in Association with Top Quarks written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson in $\ell\nu$ + Jets Final States in 9.7f̃b${̂-1}$ of $p\bar{p}$ Collisions with the D0 Detector by :
Download or read book Search for the Standard Model Higgs Boson in $\ell\nu$ + Jets Final States in 9.7f̃b${̂-1}$ of $p\bar{p}$ Collisions with the D0 Detector written by and published by . This book was released on 2013 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for the Standard Model Higgs Boson Produced in Association with Top Quark Pairs in the Leptons + Jets Final State at CDF II by : Jake Connors
Download or read book A Search for the Standard Model Higgs Boson Produced in Association with Top Quark Pairs in the Leptons + Jets Final State at CDF II written by Jake Connors and published by . This book was released on 2011 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In nature we have observed that the weak force is inherently short ranged, and thus must be mediated via heavy gauge bosons. Explicitly adding mass terms for these particles to the Standard Model Lagrangian, however, breaks the gauge symmetry upon which the theory is constructed. In 1964, the so-called "Higgs Mechanism" was independently proposed by Robert Brout, Francois Englert and Peter Higgs, which spontaneously gives rise to the masses of the gauge bosons as well as the fermions. In the Higgs mechanism, a new complex scalar $SU(2)$ doublet field is added to the SM Lagrangian which below a critical temperature acquires a vacuum expectation value through spontaneous electroweak symmetry breaking. When this field is re-expanded around its new minimum, the mediating gauge fields of the electroweak interaction are mixed to produce three heavy gauge bosons $\left(W^+, W^-, Z^0\right)$ and one massless boson, the photon. The quanta of this new field has come to be called the Higgs boson and verifying its existence remains to be one of the last important tests of the Standard Model. The mass of this new particle, however, cannot be directly calculated due to the unknown self-coupling parameter of the Higgs field. Presented within is a search for the SM Higgs boson produced in association with a top quark pair at the CDF II detector at the Tevatron in \SI{6.3}{\per\femto\barn} of data. We consider events which have 1 or more identified charged leptons, an imbalance in transverse momentum and at least 5 jets, where at least two of these jets are consistent with originating from the decay of a $B$ hadron. Using a neural network ensemble technique, we place 95\% confidence level upper limits on the $t\bar{t}H$ production cross section for several Higgs boson masses ranging from \SI{100}{\giga\eV\per c^2} to \SI{150}{\giga\eV\per c^2}. For a mass of \SI{120}{\giga\eV\per c^2} the expected limit is $16.3$ times the standard model predicted cross section.
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 A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks by : Jonathan S. Wilson
Download or read book A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks written by Jonathan S. Wilson and published by . This book was released on 2012 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We have performed a search for the Standard Model Higgs boson produced in association with top quarks in the lepton plus jets channel. We impose no constraints on the decay of the Higgs boson. We employ ensembles of neural networks to discriminate events containing a Higgs boson from the dominant di-top background, and set upper bounds on the Higgs production cross section. At a Higgs boson mass mH = 120 GeV/c2, we expect to exclude a cross section 12.7 times the Standard Model prediction, and we observe an exclusion 27.4 times the Standard Model prediction with 95% confidence.
Book Synopsis Search for New Physics in tt ̅ Final States with Additional Heavy-Flavor Jets with the ATLAS Detector by : Javier Montejo Berlingen
Download or read book Search for New Physics in tt ̅ Final States with Additional Heavy-Flavor Jets with the ATLAS Detector written by Javier Montejo Berlingen and published by Springer. This book was released on 2016-07-20 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This doctoral thesis focuses on the search for new phenomena in top-antitop quark (tt) final states with additional b-quark jets at the LHC. It uses the full Run 1 dataset collected by the ATLAS experiment in proton-proton collisions at √s=8 TeV. The final state of interest consists of an isolated lepton, a neutrino and at least six jets with at least four b-tagged jets, a challenging experimental signature owing to the large background from tt+heavy-flavor production. This final state is characteristic of ttH production, with the Higgs boson decaying into bb, a process that allows direct probing of the top-Higgs Yukawa coupling. This signature is also present in many extensions of the Standard Model that have been proposed as solutions to the hierarchy problem, such as supersymmetry or composite Higgs models, which predict the pair production of bosonic or fermionic top quark partners, or the anomalous production of four-top-quark events. All these physics processes have been searched for using an ambitious search strategy that has been developed on the basis of a combination of state-of-art theoretical predictions and a sophisticated statistical analysis to constrain in-situ the large background uncertainties. As a result, the most restrictive bounds to date on the above physics processes have been obtained.
Book Synopsis Search for the Standard Model Higgs Boson Decaying to a $W$ Pair in the Fully Leptonic Final State in $pp$ Collisions at $\sqrt{s} by :
Download or read book Search for the Standard Model Higgs Boson Decaying to a $W$ Pair in the Fully Leptonic Final State in $pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2012 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson decaying to W+W- in pp collisions at sqrt(s) = 7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. The W+W- candidates are selected in events with two charged leptons and large missing transverse energy. No significant excess of events above the standard model background expectations is observed, and upper limits on the Higgs boson production relative to the standard model Higgs expectation are derived. The standard model Higgs boson is excluded in the mass range 129-270 GeV at 95% confidence level.
Book Synopsis Search for the Standard Model Higgs Boson in Topologies with a Charged Lepton Pair at a Center-of-mass Energy of 188.6 GeV with the ALEPH Detector by : Thomas C. Greening
Download or read book Search for the Standard Model Higgs Boson in Topologies with a Charged Lepton Pair at a Center-of-mass Energy of 188.6 GeV with the ALEPH Detector written by Thomas C. Greening and published by . This book was released on 1999 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 the Standard Model Higgs Boson in Four-jet Final States in Center-of-mass Energies Near 193 GeV with the ALEPH Detector at LEP by : Stephen R. Armstrong
Download or read book A Search for the Standard Model Higgs Boson in Four-jet Final States in Center-of-mass Energies Near 193 GeV with the ALEPH Detector at LEP written by Stephen R. Armstrong and published by . This book was released on 1998 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for The Standard Model Higgs Boson in the Four Lepton Final State by the D0 Experiment at Run II of the Tevatron Collider by :
Download or read book Search for The Standard Model Higgs Boson in the Four Lepton Final State by the D0 Experiment at Run II of the Tevatron Collider written by and published by . This book was released on 2013 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for a Higgs Boson in the Decay Channel $H$ to ZZ(*) to $q$ Qbar $\ell-̂$ L+ in $pp$ Collisions at $\sqrt{s} by :
Download or read book Search for a Higgs Boson in the Decay Channel $H$ to ZZ(*) to $q$ Qbar $\ell-̂$ L+ in $pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson decaying into two Z bosons with subsequent decay into a final state containing two quark jets and two leptons, H to ZZ(*) to q q-bar l-l+ is presented. Results are based on data corresponding to an integrated luminosity of 4.6 inverse femtobarns of proton-proton collisions at sqrt(s)=7 TeV, collected with the CMS detector at the LHC. In order to discriminate between signal and background events, kinematic and topological quantities, including the angular spin correlations of the decay products, are employed. Events are further classified according to the probability of the jets to originate from quarks of light or heavy flavor or from gluons. No evidence for the Higgs boson is found, and upper limits on its production cross section are determined for a Higgs boson of mass between 130 and 600 GeV.
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