Search For Associated Higgs Boson Production Using Like Charge Dilepton Events In P P Collisions At U221a S
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Search For Associated Higgs Boson Production Using Like Charge Dilepton Events In P P Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2011
Search For Associated Higgs Boson Production Using Like Charge Dilepton Events In P P Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We present a search for associated Higgs boson production in the process pp→ W/ZH → ell± ell± + X in ee, e?, and ?? final states. The search is based on data collected by the D0 experiment at the Fermilab Tevatron Collider at √s = 1.96 TeV corresponding to 5.3 fb-1 of integrated luminosity. We require two isolated leptons (electrons or muons) with the same electric charge and additional kinematic requirements. No significant excess above background is observed, and we set 95% C.L. observed (expected) upper limits on ratio of the production cross sectin to the standard model expectation of 6.4 (7.3) for a Higgs boson mass of 165 GeV and 13.5 (19.8) for a mass of 115 GeV.
Search For Associated Higgs Boson Production Using Like Charge Dilepton Events In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For Associated Higgs Boson Production Using Like Charge Dilepton Events In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We present a search for associated Higgs boson production in the process p{anti p} → W/ZH → l{sup {+-}} l{sup {+-}} + X in ee, e[mu], and [mu][mu] final states. The search is based on data collected by the D0 experiment at the Fermilab Tevatron Collider at √{ovr s} = 1.96 TeV corresponding to 5.3 fb−1 of integrated luminosity. We require two isolated leptons (electrons or muons) with the same electric charge and additional kinematic requirements. No significant excess above background is observed, and we set 95% C.L. observed (expected) upper limits on ratio of the production cross sectin to the standard model expectation of 6.4 (7.3) for a Higgs boson mass of 165 GeV and 13.5 (19.8) for a mass of 115 GeV.
Search For Wh Production Using High P T Isolated Like Sign Dilepton Events In 1 96 Tev Proton Antiproton Collisions
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language : en
Publisher:
Release Date : 2009
Search For Wh Production Using High P T Isolated Like Sign Dilepton Events In 1 96 Tev Proton Antiproton Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The thesis describes search for the neutral Higgs production associated with the W boson using high-PT isolated like-sign (LS) dilepton events in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV.
Search For The Higgs Boson Using High Pt Isolated Like Sign Dil Events In 1 96 Tev Proton Antiproton Collisions
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Author :
language : en
Publisher:
Release Date : 2005
Search For The Higgs Boson Using High Pt Isolated Like Sign Dil Events In 1 96 Tev Proton Antiproton Collisions 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 categories.
Our physics objective is to search for the neutral on using events containing a like-sign dilepton pair in the following reaction: q{bar q} 2!W{sup {+-}} H 2!W{sup {+-}} W*W* 2!l{sup {+-}}l{sup {+-}} + X. The relevant Higgs boson mass region is above 160 GeV/c2 for the Standard Model Higgs boson where the branching fraction of H 2!W*W* supersedes that of H 2!b{bar b}. The search for this signature in the region at low mass (less than 135 GeV/c2) is, however, still important because we need to investigate various Higgs boson couplings as an essential test to convince that signals are attributed to the Higgs boson production. This channel also covers the case beyond the Standard Model that the Higgs boson couples only to the gauge bosons, which is referred to as the bosophilic or fermiophobic Higgs boson. The corresponding mass region suitable to our signature is above 110 GeV/c2 where the branching fraction of H 2![gamma][gamma] is overtaken by this channel. On the experimental side, the like-sign dilepton event is one of the cleanest signature in hadron collisions. This analysis exploiting such a distinctive signature is therefore expected to have a high potential of the sensitivity for the search of the Higgs boson. The data were collected with the CDF II detector between March 2002 and September 2003, corresponding to an integrated luminosity of 193.5 pb−1. At off-line, the central region).
Search For A Massive Resonance Decaying Into A Higgs Boson And A W Or Z Boson In Hadronic Final States In Proton Proton Collisions At U221a S
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language : en
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Release Date : 2015
Search For A Massive Resonance Decaying Into A Higgs Boson And A W Or Z Boson In Hadronic Final States In Proton Proton Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 fb–1, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying in HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify H → WW* → 4q decays at high Lorentz boost. Furthermore, no significant signal is observed and limits are set at 95% confidence level on the production cross section of W' and Z' in a model with mass-degenerate charged and neutral spin-1 resonances.
Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass In Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2015
Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Our search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ll?). The analysis is performed using proton–proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120 mll? 150 GeV, and limits have been derived for the Higgs boson production cross section times branching fraction for the decay H → ?*? → ll?, where the dilepton invariant mass is less than 20 GeV. A Higgs boson with mH=125 GeV has a 95% confidence level (CL) exclusion observed (expected) limit is 6.7 (5.9sup+2.8/supsub-1.8/sub ) times the standard model prediction. Additionally, an upper limit at 95% CL on the branching fraction of H → (J/?)? for the 125 GeV Higgs boson is set at 1.5 × 10
Search For Wh Associated Production In P Bar P Collisions At Sqrt S
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Author :
language : en
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Release Date : 2012
Search For Wh Associated Production In P Bar P Collisions At Sqrt S written by 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.
This report describes a search for associated production of W and Higgs bosons based on data corresponding to an integrated luminosity of L ≈ 5.3 fb−1 collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider. Events containing a W → l? candidate (with l corresponding to e or?) are selected in association with two or three reconstructed jets. One or two of the jets are required to be consistent with having evolved from a b quark. A multivariate discriminant technique is used to improve the separation of signal and backgrounds. Expected and observed upper limits are obtained for the product of the WH production cross section and branching ratios and reported in terms of ratios relative to the prediction of the standard model as a function of the mass of the Higgs boson (M{sub H}). The observed and expected 95% C.L. upper limits obtained for an assumed M{sub H} = 115 GeV are, respectively, factors of 4.5 and 4.8 larger than the value predicted by the standard model.
Search For The Associated Production Of A Higgs Boson With A Single Top Quark In Proton Proton Collisions At S
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language : en
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Release Date : 2016
Search For The Associated Production Of A Higgs Boson With A Single Top Quark In Proton Proton Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A search is presented for the Higgs boson off-shell production in gluon fusion and vector boson fusion processes with the Higgs boson decaying into a WW pair and the W bosons decaying leptonically. The data observed in this analysis are used to constrain the Higgs boson total decay width. The analysis is based on the data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 4.9 inverse femtobarns at a centre-of-mass energy of 7 TeV and 19.4 inverse femtobarns at 8 TeV, respectively. An observed (expected) upper limit on the off-shell Higgs boson event yield normalised to the standard model prediction of 2.4 (6.2) is obtained at the 95% CL for the gluon fusion process and of 19.3 (34.4) for the vector boson fusion process. Observed and expected limits on the total width of 26 and 66 MeV are found, respectively, at the 95% confidence level (CL). These limits are combined with the previous result in the ZZ channel leading to observed and expected 95% CL upper limits on the width of 13 and 26 MeV, respectively.
Search For Higgs Bosons Decaying To Aa In The Final State In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Higgs Bosons Decaying To Aa In The Final State In Pp Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for the decay to a pair of new particles of either the 125 GeV Higgs boson (h) or a second charge parity (CP)-even Higgs boson (H) is presented. The data set corresponds to an integrated luminosity of 20.3 fb-1 of pp collisions at √s = 8 TeV recorded by the ATLAS experiment at the LHC in 2012. The search was done in the context of the next-to-minimal supersymmetric standard model, in which the new particles are the lightest neutral pseudoscalar Higgs bosons (a). One of the two a bosons is required to decay to two muons while the other is required to decay to two ? leptons. No significant excess is observed above the expected backgrounds in the dimuon invariant mass range from 3.7 to 50 GeV. The upper limits are placed on the production of h → aa relative to the standard model gg → h production, assuming no coupling of the a boson to quarks. The most stringent limit is placed at 3.5% for ma = 3.75 GeV. Upper limits are also placed on the production cross section of H → aa from 2.33 to 0.72 pb, for fixed ma = 5 GeV with mH ranging from 100 to 500 GeV.
Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For A Higgs Boson Decaying Into Gamma Gamma To Ell Ell Gamma With Low Dilepton Mass In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Our search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ll[gamma]). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120