Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session R16: Top Quark Physics |
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Sponsoring Units: DPF Chair: Dmitri Denisov, Fermi National Accelerator Laboratory Room: Key 12 |
Monday, April 13, 2015 10:45AM - 10:57AM |
R16.00001: Measurements of Top Quark Mass at the Tevatron in the dilepton final state using neutrino weighting HuanZhao Liu We present the measurement of the mass of the top quark ($m_t$) in inclusive dilepton final states of $t\bar{t}$ events using the full Run II data set corresponding to an integrated luminosity of 9.7 fb$^{?1}$. Employing the expected neutrino rapidity distribution the neutrino weighting technique is used to extract a measurement of $m_t$. Ensemble tests of pseudo-experiments are performed to calibrate and correct the extracted $m_t$, and to estimate its statistical uncertainty. The measured top quark mass is reported and compared to other recent mass measurements. [Preview Abstract] |
Monday, April 13, 2015 10:57AM - 11:09AM |
R16.00002: Measurements of Top Quark Mass at the Tevatron in the dilepton final state Maryna Borysova We report a measurement of the mass of the heaviest known standard model particle, the top quark, at the Fermilab Tevatron Collider in proton-antiproton collisions using a final state with the two leptons and two $b$ quarks. For this measurement we use the matrix element technique, which is known to have the highest statistical precision. We analyzed the full D0 data set corresponding to an integrated luminosity of 9.7 fb$^{-1}$. The agreement with the D0 $\ell$+jet measurements and influence on the top quark mass combinations are discussed. [Preview Abstract] |
Monday, April 13, 2015 11:09AM - 11:21AM |
R16.00003: Measurements of the Mass of the Top Quark with sqrt(s) = 8 TeV CMS Data Richard Nally The mass of the top quark is an important parameter of the Standard Model, and has been studied continuously for almost twenty years. We present measurements of the mass of the top quark from the full 2012 Compact Muon Solenoid (CMS) dataset, corresponding to an Integrated luminosity of 19.7 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of $\sqrt{s} = 8$ TeV. We measure the mass of the top quark in events with top-antitop pair decays, with zero-, one-, or two-lepton final states with jets. Events are reconstructed with the ideogram method and the Analytical Matrix Weighting Technique (AMWT). [Preview Abstract] |
Monday, April 13, 2015 11:21AM - 11:33AM |
R16.00004: Measurement of the differential top-quark pair-production cross section for top quarks with high transverse momentum Susan Dittmer, Maral Alyari, Matthew Bellis, Salvatore Rappoccio, Louise Skinnari, Julia Thom We report a measurement of the differential top-quark pair-production cross section for top quarks with high transverse momentum (pT) in pp collisions at a center-of-mass energy of 8 TeV. The data sample was collected with the CMS detector during 2012 and corresponds to an integrated luminosity of 19.7 $\pm$ 0.5 fb-1 for events in the muon+jets final state where the hadronically decaying top quark has pT $>$ 400 GeV and is reconstructed as a single, wide, top-tagged jet. The background normalizations and the inclusive signal yield are extracted simultaneously with the top-tagging efficiency through template likelihood fits. [Preview Abstract] |
Monday, April 13, 2015 11:33AM - 11:45AM |
R16.00005: Measurement of properties of additional jets in top quark pair decays using $e\mu$ events with 2 $b$-jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector Jacquelyn Brosamer The transverse momentum and multiplicity of additional jets produced in association with top quark pairs are measured in 20.1 fb$^{-1}$ proton-proton collisions at $\sqrt{s}=8$ TeV collected in 2012 with the ATLAS experiment at the LHC. Jets are selected from $t\bar{t}$ events with an opposite-charge $e\mu$ pair and at least two $b$-tagged jets in the final state. The reconstructed jets are fully corrected for detector effects to obtain particle-level distributions in the fiducial region. The corrected data are compared to several Monte Carlo models. [Preview Abstract] |
Monday, April 13, 2015 11:45AM - 11:57AM |
R16.00006: Search for Monotop Production in Semi-Leptonic Decays of Top Quarks at $\mathbf{\sqrt{s}= 8}$ TeV Using the ATLAS Detector Andrew Chegwidden This beyond the Standard Model search looks for events where single top quarks are produced in association with missing transverse energy. This missing transverse energy can be attributed to a neutral, long lived or stable, non-interacting particle which could be considered a dark matter candidate. The final state topology can either be created via baryon number violating or flavor changing neutral current interactions. Data collected at a center-of-mass energy of 8 TeV during 2012 corresponding to an integrated luminosity of $20.3$~fb$^{-1}$ are used. The current search results will be presented along with future plans for the analysis. [Preview Abstract] |
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