Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session C9: Higgs Searches II |
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Sponsoring Units: DPF Chair: Alexey Drozdetskiy, University of Florida Room: Embassy E |
Saturday, March 31, 2012 1:30PM - 1:42PM |
C9.00001: Search For the Higgs Boson Decaying to Two Photons with the ATLAS Detector Amanda Kruse I will report on the search for the low mass Higgs boson in the Higgs to two photons decay channel with the ATLAS detector based on 4.9 fb$^{-1}$ of data collected at 7 TeV CM energy. This decay channel is of great current interest in the Higgs search, and I will present the most recent results. [Preview Abstract] |
Saturday, March 31, 2012 1:42PM - 1:54PM |
C9.00002: Search for the Higgs Boson Decaying to Bottom Quarks Michael Mooney A search for the Higgs boson produced in association with a W or Z boson and decaying to bottom quarks is presented. A sample of approximately 4.7/fb of data recorded by the CMS experiment at the Large Hadron Collider, operating at a center of mass energy of 7 TeV, is used to search for events consistent with the signature of two b jets recoiling with high momentum from a W(${\ell\nu}$), Z(${\ell\ell}$), or Z(${\nu\nu}$) decay, where ${\ell}$ = electron or muon. The observed number of events is consistent with background, and 95{\%} confidence level upper limits on the production cross section relative to the standard model prediction are presented. [Preview Abstract] |
Saturday, March 31, 2012 1:54PM - 2:06PM |
C9.00003: Search for the SM $ZH\to ee b\bar{b}$ production at D0 Peng Jiang The Higgs mechanism is the favored theoretical model to describe the observed breaking of electroweak symmetry within the standard model. Recent results from LHC and Tevatron have narrowed the Higgs mass search range to 115 to 130 GeV. We present the analysis strategies and recent results in the search for the standard model Higgs boson in $ZH \to ee b\bar{b}$ channel at the D0 experiment using 9.7~$^{fb-1}$ data from the Fermilab Tevatron collider. [Preview Abstract] |
Saturday, March 31, 2012 2:06PM - 2:18PM |
C9.00004: Search for the SM $ZH\to\mu\mu b\bar{b}$ production at D0 Jiaming Yu We present a search for the low mass standard model Higgs boson produced in association with a $Z$ boson, using 9.7~fb$^{-1}$ of data collected by the D0 detector at $\sqrt{s} = 1.96$~TeV. Events are selected to have a $Z$ candidate reconstructed either with two muons or one muon plus an isolated track, and at least two reconstructed jets with one or two jets satisfying the b-tagging requirements. A discriminant variable based on multivariate analysis technique is used to separate the Higgs signal and backgrounds. Upper limits on the $ZH$ production cross section times branching ratio are set at 95\% C.L. for the Higgs mass from 90 GeV to 150 GeV. [Preview Abstract] |
Saturday, March 31, 2012 2:18PM - 2:30PM |
C9.00005: Search for associated production of $Z$ and Higgs bosons in $\nu\bar{\nu}b\bar{b}$ final states in $p\bar{p}$ collissions at $\sqrt{s}=1.96$ TeV Xiaowen Lei We present a search for a low mass Standard Model Higgs boson produced in association of a $Z$ boson decaying invisibly into a pair of neutrinos at a center-of-mass energy of 1.96 TeV with the D0 detector at the Fermilab Tevatron collider. The final state is characterised by the presence of two b-tagged jets from the Higgs boson decay and a large imbalance in the transverse energy of the event due to the neutrinos. This channel is very powerful because of the large $Z\to\nu\bar{\nu}$ branching ratio, but is experimentally very challenging due to the large QCD backgrounds and absence of visible leptons in the final state. Recent improvements, as well as results with the final full data sample, at 9.6 fb$^{-1}$, will be discussed. [Preview Abstract] |
Saturday, March 31, 2012 2:30PM - 2:42PM |
C9.00006: Multivariate Techniques and b-tagging Optimization in Standard Model $WH$ Searches at DO Savanna Shaw We search for the standard model Higgs boson produced in association with a $W$ boson using data collected with the D0 detector corresponding to 9.7~fb$^{-1}$ of integrated luminosity of $p\bar{p}$ collisions at $\sqrt{s}=1.96$~TeV at the Fermilab Tevatron collider. We select events with a lepton ($e$ or $\mu$), missing $E_{T}$, and two or three reconstructed jets. We split the candidate events based on the number and quality of jets that are tagged as originating from a $b$-quark, and apply multivariate techniques to further separate signal from background. This talk will focus on the optimization of $b$-tagging and the choice of variables used in the multivariate analysis. [Preview Abstract] |
Saturday, March 31, 2012 2:42PM - 2:54PM |
C9.00007: Improved $b$-quark identification strategy for the low mass Higgs boson searches at CDF Yuri Oksuzian We describe the optimization of a new $b$-jet identification method used in the Higgs boson searches at the CDF experiment at Fermilab. The method makes use of the Higgs Optimized B-Identification Tagger(HOBIT), which combines the information from various existing $b$-jet identification tools used at CDF via a multivariate algorithm. We consider the implementation of HOBIT for the Higgs boson search in the WH channel, where the Higgs boson is produced in association with a W boson. As the result, an improvement in the Higgs boson sensitivity in the WH channel of more than 10\% is expected. The method presented can be applied to all of the primary low mass Higgs boson searches at CDF where the decay of the Higgs boson into a pair of $b$ quarks is dominant. [Preview Abstract] |
Saturday, March 31, 2012 2:54PM - 3:06PM |
C9.00008: Improving the Trigger Efficiency Calculation for the WH-lvbb analysis at the CDF experiment Hao Liu At CDF, we search for the associated production of a Higgs boson and a W boson, where the Higgs boson decays into a b + anti-b quark pair and the W boson decays into a lepton and the corresponding neutrino. Events are selected with a signature of a lepton, large missing transvers energy, and two or three jets. The events are selected by a variety of triggers, and those triggers are divided into several streams based on the types of requirements of the trigger. In previous WH searches we only use some of triggers, because the trigger efficiency can be calculated easily under those circumstances. In this presentation, we will describe two new triggers to select leptons and will demonstrate a new method using neural networks to calculate the trigger efficiency for a set of triggers. In this way, we maximized the acceptance of events selected, and the gain in the sensitivity of the WH analysis is about 5\%. [Preview Abstract] |
Saturday, March 31, 2012 3:06PM - 3:18PM |
C9.00009: Jet Identification and Dijet Mass Resolution for Standard Model Higgs Searches at D0 Dikai Li We search for the standard model Higgs boson with the D0 detector at the Fermilab Tevatron collider with 9.7~fb$^{-1}$ of integrated luminosity in $p\bar{p}$ collisions at $\sqrt{s}=1.96$~TeV in association with $W$ or $Z$ boson, considering $H\to b\bar{b}$ decays. We will present the jet identification criteria used in the analyses to maximize the sensitivity to a possible Higgs boson signal and discuss the algorithms used to improve the di-jet invariant mass resolution. [Preview Abstract] |
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