Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session B9: Higgs Searches I |
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Sponsoring Units: DPF Chair: Nikos Varelas, University of Illinois at Chicago Room: Embassy E |
Saturday, March 31, 2012 10:45AM - 10:57AM |
B9.00001: Search for the Standard Model Higgs boson in the WW$\rightarrow$l$\nu$l$\nu$ final state Shannon Walch The latest results on the search for the standard model Higgs boson in the WW to two leptons plus missing transverse energy final state using the ATLAS detector are presented. 4.7 $\rm{fb}^{-1}$ of $pp$ collisions with 7 TeV center of mass energy collected at the LHC were used for this study. This search is conducted using a cut-based analysis in nine channels defined by lepton flavor and jet multiplicity. Results from recently developed data-driven methods to estimate backgrounds will be discussed. The latest results on limits on the mass of the standard model Higgs boson and significances of observed excesses will be presented. [Preview Abstract] |
Saturday, March 31, 2012 10:57AM - 11:09AM |
B9.00002: Search for the Higgs in the ZZ to llvv decay mode Kevin Sung With the data sample of 2011 provided by the LHC, the hunt for the higgs boson is in full swing. The decay in the ZZ channel, where one Z decays to charged leptons and the other to neutrinos has reasonable exclusion potential in the high mass region of the range of possible Higgs masses. We describe the salient details of the CMS analysis, including the current exclusion limit and the potential for improvement in the next year. [Preview Abstract] |
Saturday, March 31, 2012 11:09AM - 11:21AM |
B9.00003: ABSTRACT WITHDRAWN |
Saturday, March 31, 2012 11:21AM - 11:33AM |
B9.00004: Search for a Higgs Boson Produced in Association with a Vector Boson Using Like-Sign Dilepton Events at CDF Daisuke Yamato, Toru Okusawa, Yoshihiro Seiya, Takayuki Wakisaka, Kazuhiro Yamamoto We present a search for the neutral higgs boson produced in associated with a vector boson using high-$p_{T}$ isolated like-sign dilepton events in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV. The data were collected with the CDF-II detector at the Fermilab Tevatron collider. We employ the Boosted Decision Tree technique for separating the backgrounds from signal events to improve the search sensitivity. No signal is observed in the CDF data and we set limits on the production rate of the Higgs boson in the standard model and in an alternative fermiophobic scenario. [Preview Abstract] |
Saturday, March 31, 2012 11:33AM - 11:45AM |
B9.00005: Search for a Higgs boson in the decay channel $H \rightarrow ZZ^{(*)} \rightarrow 4l$ Matthew Snowball The Higgs boson is the most anticipated theoretical particle in the last half century. The start of the Large Hadron Collider at CERN in Geneva, Switzerland ushered in a new age for particle colliders and accelerated the search for the elusive Higgs boson beyond the sensitivities of LEP and Tevatron. With an enormous amount of data being recorded faster than ever before, the experiments at the LHC have the ability to find or exclude the Higgs boson anywhere in the mass search range of 100 to 600 GeV. One of the most sensitive decay channels of the Higgs is the $H \rightarrow ZZ \rightarrow 4\ell$, or ``golden channel" as it is known. With its low Standard Model background and very clean four lepton final state, the golden channel is one of the best ways to find or exclude Higgs at the LHC. In this presentation, I will present the results of the search for the Higgs boson at the CMS detector in the $H \rightarrow ZZ \rightarrow 4\ell$ decay channel using the 2010+2011 dataset corresponding to approximately $5fb^{-1}$. I will discuss the general search strategy, results, and excluded mass range, as well as the prospects for the search in 2012. [Preview Abstract] |
Saturday, March 31, 2012 11:45AM - 11:57AM |
B9.00006: Search for the Standard Model Higgs Boson in the $H\to WW\to\ell\nu q'\bar{q}$ Decay Channel Huong Nguyen A search for the standard model Higgs boson ($H$) is performed using data corresponding to 9.7~fb$^{-1 }$ of $p\bar{p}$ collisions at $\sqrt{s}=1.96$~TeV collected by the D0 detector at the Fermilab Tevatron collider. We consider final states containing one lepton ($e$ or $\mu$), missing transverse energy, and exactly two or three jets. Our search is primarily sensitive to the processes $H \to W^+W^-$ $\to \ell\nu q'\bar{q}$, where the $H$ is produced by either gluon fusion or weak-boson fusion, and where one $W$ decays leptonically into a charged lepton plus neutrino and the other $W$ decays hardronically into a pair of quarks. The search is also sensitive to other Higgs boson channels with different production process, but similar final states such as $WH \to \ell\nu b\bar{b}$. To improve the signal sensitivity, we focus on making optimal use of available kinematic information by dividing the data into orthogonal sub-samples and identifying specific kinematic variables to perform a multivariate analysis for each sample. [Preview Abstract] |
Saturday, March 31, 2012 11:57AM - 12:09PM |
B9.00007: Search for the SM Higgs Boson in the lepton and neutrino and four jets final state at D0 Ryuji Yamada A search for the standard model Higgs boson is performed in final states with a lepton, neutrino, and four jets with the D0 Detector at the Fermilab Tevatron Collider, using the full Run II data set. This new dedicated search channel is focused on the $WH \to WWW \to \ell\nu jjjj$ decay process, but includes significant contributions from $H \to WW \to \ell\nu jj + X$ decays. Backgrounds from $t\bar{t}$ production are reduced by removing events with strong $b$-jet identification tags. Multivariate analysis techniques are used to distinguish between signal and background and improve the sensitivity of the search. [Preview Abstract] |
Saturday, March 31, 2012 12:09PM - 12:21PM |
B9.00008: Search for the Higgs boson in electron tau plus jet final states Ian Howley We present a search based on D0 data for the standard model Higgs boson in final states of two tau leptons and at least two jets, with one of the tau's decaying to an electron and the second decaying hadronically. A number of Higgs production and decay processes contribute in different proportions as a function of Higgs boson mass. The identification of hadronically decaying tau leptons is discussed and the ratio of 95\% C.L. Higgs cross section lower limits from the data to that expected in the standard model is obtained. Many of the techniques for this search are common with those described in the companion abstract ``{\it Search for the Higgs boson in muon tau plus jet final states}" and the two presentations will jointly cover these. [Preview Abstract] |
Saturday, March 31, 2012 12:21PM - 12:33PM |
B9.00009: Search for the Higgs boson in muon tau plus jet final states Wanyu Ye We present a search based on D0 data for the standard model Higgs boson in final states of two tau leptons and at least two jets, with one of the tau's decaying to a muon and the second decaying hadronically. A multivariate analysis based upon a set of variables that distinguish signals from backgrounds is employed. The ratio of 95\% C.L. Higgs cross section lower limits from the data to that expected in the standard model is obtained. The combination of these limits and companion searches in other channels involving tau pairs are presented. Many of the techniques for this search are common with those described in the companion abstract``{\it Search for the Higgs boson in electron tau plus jet final states}" and the two presentations will jointly cover these. [Preview Abstract] |
Saturday, March 31, 2012 12:33PM - 12:45PM |
B9.00010: Study of systematic uncertainties for Higgs Boson Searches in $H\rightarrow \gamma \gamma$ and $H\rightarrow W^{+}W^{-} \rightarrow l^{+} \nu l^{-} \nu$ Final States in ATLAS Hee Yeun Kim This study focuses on the theoretical systematic uncertainties for Higgs particle searches in $H\rightarrow \gamma \gamma$ and $H\rightarrow W^{+}W^{-} \rightarrow l^{+} \nu l^{-} \nu$ channels at ATLAS and for background processes. The precision of Monte Carlo event generator predictions benefit dramatically from the inclusion of higher-order corrections in various ways in total and differential cross sections. In this study, two different combinations of Monte-Carlo tools, PowhegBox-Pythia and PowhegBox-Herwig, are used with various Parton Distribution Function sets in CTEQ6.6 and MSTW2008NLO for systematic uncertainties resulting from parton showering and PDF uncertainties. Large scale Monte-Carlo event simulations have been performed to estimate the background. Cut based analyses have been done and theoretical predictions have been compared to the 2011 ATLAS data. This enables us to understand the underlying parton dynamics in the processes, and to quantify the theoretical systematic uncertainties in background estimates and Higgs signal cross sections. [Preview Abstract] |
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