Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session X14: Higgs |
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Sponsoring Units: DPF Chair: Al Goshaw, Duke University Room: Hyatt Regency Jacksonville Riverfront City Terrace 10 |
Tuesday, April 17, 2007 10:45AM - 10:57AM |
X14.00001: Search for Neutral Supersymmetric Higgs Bosons in $bbh$ Final States Stephen Robinson Many extensions of the Standard Model predict greatly enhanced production rates of neutral Higgs bosons in association with bottom quarks. The Tevatron Run II data collected by the D0 detector are used to search for Higgs bosons in $bh(\rightarrow b\bar{b})$ and $bbh(\rightarrow b\bar{b})$ channels that result to 3b-jet and 4b-jet final states, respectively. The results of the current search are presented. [Preview Abstract] |
Tuesday, April 17, 2007 10:57AM - 11:09AM |
X14.00002: Search for $H \rightarrow WW^\ast$ at CDF Dean Hidas, Toby Davies, Doug Benjamin, Peter Bussey, Mark Kruse, Aidan Robson, Richard St. Denis, A.S. Thompson We present a search for single Higgs production with decay to two W bosons using about $1~{\rm fb^{-1}}$ of CDF Run II data. For Higgs masses greater than about $140~{\rm GeV}/c^2$ the branching ratio to W pairs starts to dominate over that to $b\bar{b}$. We require that both W bosons decay leptonically, and use kinematic variables that discrimate between $H \rightarrow WW^\ast$ and the main background processes in the Neural Network to set cross-section limits on $\sigma (gg \rightarrow H) \times BR(H \rightarrow WW^\ast$ as function of Higgs masses between 110 and 200 GeV/$c^2$. [Preview Abstract] |
Tuesday, April 17, 2007 11:09AM - 11:21AM |
X14.00003: Search for Higgs boson production in association with a W boson at CDF Tatsuya Masubuchi, Yoshio Ishizawa, Shinhong Kim, Kunitaka Kondo, Yoshiaki Kusakabe, Michael McFarlane, Jason Nielsen, Anyes Taffard, Weiming Yao We present a search for the Higgs boson decaying to b$\bar{\mathrm{b}}$, produced in association with a W boson in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV. A dataset corresponding to an integrated luminosity of 1.2~fb$^{-1}$ is used in this search. Selected events have one high-$p_{T}$ electron or muon, missing $E_{T}$ and two jets. In addition, we apply advanced event selection criteria and optimized b-tagging strategies to reduce the large W+jet backgrounds and improve the search sensitivity. We set a 95\% Confidence Level upper limit with the combined one b-tag and two b-tag samples, on the production cross section times branching ratio as a function of the mass of the Higgs boson. [Preview Abstract] |
Tuesday, April 17, 2007 11:21AM - 11:33AM |
X14.00004: Search for Higgs Bosons in $WW^*\rightarrow\ell^+\ell'^-$ Decays Jonas Strandberg The process $H\rightarrow WW^*\rightarrow\ell^+\ell'^-$ ($\ell$, $\ell'$ = $e$,$\mu$) is studied in $p\bar{p}$ collisions at the center of mass energy $\sqrt{s} = 1.96$ TeV with the upgraded D0 detector at the Fermilab Tevatron accelerator. A Higgs particle with a mass greater than 140 GeV primarily decays into a of W-bosons and the semi-leptonic decay channels of the W provide a clear signature. Besides the search for the Standard Model Higgs, exotic models with enhanced Higgs production cross sections are already probed with data corresponding to integrated luminosity of 0.9 fb$^{^-1}$. [Preview Abstract] |
Tuesday, April 17, 2007 11:33AM - 11:45AM |
X14.00005: Search for Higgs Bosons in $WW^*\rightarrow\ell\tau$ Decays Bjoern Penning The D0 experiment is performing very well and recent Higgs analyses are approaching sensitivity as predicted in the 1998 Higgs/SUSY workshop. In these initial studies the final states including hadronically decaying $\tau$ leptons were neglected. Analysis of these channels would improve the current limits of Higgs production cross section due to a large $\tau\rightarrow$hadrons branching fraction. In this talk a study of the $H\rightarrow WW^*\rightarrow\ell\tau$ channel ($\ell=e,\mu$) is presented. A preliminary combination with another analysis using the two lepton final state shows a clear improvement on the sensitivity. [Preview Abstract] |
Tuesday, April 17, 2007 11:45AM - 11:57AM |
X14.00006: Combined Upper Limit on Standard Model Higgs Boson Production at D0 Jeremie Lellouch A combination of several searches for Standard Model Higgs boson production at D0 is presented. The contributing processes include associated production ($WH\rightarrow\ell\nu b\bar{b}$, $ZH\rightarrow\nu\nu b\bar{b} $, $ZH\rightarrow\ell\ell b\bar{b}$, and $WH\rightarrow WWW$) and gluon fusion ($gg\rightarrow H\rightarrow WW$). Analyses are performed on data corresponding to integrated luminosities from 0.4 pb$^{-1}$ to 1 fb$^{^-1}$. [Preview Abstract] |
Tuesday, April 17, 2007 11:57AM - 12:09PM |
X14.00007: Search for Associated Production of W and Higgs Bosons in $\ell\nu b\bar{b}$ Final States Miruna Anastasoaie We present preliminary results of a search for the Higgs boson through its associated production with W for masses between 105 and 155 GeV in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV. The search is performed in events containing one lepton (electron or muon), an imbalance in the transverse energy, and two b-tagged jets in 1.0 fb$^{-1}$ of integrated luminosity accumulated by the D0 experiment at Fermilab. [Preview Abstract] |
Tuesday, April 17, 2007 12:09PM - 12:21PM |
X14.00008: Search for Associated Production of Z and Higgs Bosons in $\ell^+\ell^- b\bar{b}$ Final States Lucian Ancu Studies are presented of the search for a light Standard Model Higgs boson produced in association with a Z boson in the $Z\rightarrow\ell^+\ell^-$ ($\ell$ = electron or muon) and $H\rightarrow b\bar{b}$ decay channel using 0.9 fb$^{^-1}$ of integrated luminosity of Run II data collected by the D0 detector at the Fermilab $p\bar{p}$ collider at $\sqrt{s} = 1.96$ TeV. [Preview Abstract] |
Tuesday, April 17, 2007 12:21PM - 12:33PM |
X14.00009: Search for Associated Production of Z and Higgs Bosons in $\nu\nu b\bar{b}$ Final States Theodoros Christoudias Studies are presented from the D0 experiment at Fermilab for the search for a light Standard Model Higgs Boson in association with a Z boson, which decays invisibly to a pair of neutrinos using 0.9 fb$^{^-1}$ of integrated luminosity of Run II data. This channel relies on the identification of two b-tagged jets from the Higgs Boson decay and on the measurement of a large imbalance in the transverse energy of the event. This channel is challenging as the decay signatures are common in QCD and instrumental backgrounds. [Preview Abstract] |
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