Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session B17: Electroweak Physics |
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Sponsoring Units: DPF Chair: Mirjam Cvetic, University of Pennsylvania Room: 251E |
Saturday, April 16, 2016 10:45AM - 10:57AM |
B17.00001: Measurement of Z boson + heavy flavor jet production in pp collisions at $\sqrt{s}$ = 8 TeV Andrew Godshalk We present results on the heavy flavor jet production in association with the Z boson using proton-proton collision data collected with the CMS detector at a center of mass energy $\sqrt{s}$ = 8 TeV. We discuss, in particular, the measurement of the ratio of cross-sections, $\sigma$(Z+c-jet)/$\sigma$(Z+jets) and $\sigma$(Z+b-jet)/$\sigma$(Z+jets). Studies of these processes provide tests of perturbative QCD predictions and non-perturbative effects. These processes are also important backgrounds to many precision SM measurements as well as to searches for new physics. [Preview Abstract] |
Saturday, April 16, 2016 10:57AM - 11:09AM |
B17.00002: Study of electroweak WW/WZ production accompanied with a high invariant-mass dijet system, in the semileptonic final state, and limits on anomalous quartic gauge couplings with the ATLAS detector. Dmitri Tsybychev We present a study of electroweak WW or WZ production in association with two additional jets, and limits on anomalous quartic gauge boson couplings in the semileptonic final state with the ATLAS detector at s $=$ 8 TeV. The WW/WZ process is identified through a lepton plus large missing transverse energy and either two small-radius jets or one large-radius jet, with the mass of the jets consistent with the W/Z mass. The two additional jets are required to have a large invariant mass, characteristic of vector boson scattering. The reconstructed transverse mass of the di-boson system is used to set limits on anomalous contributions to the quartic gauge boson interactions. [Preview Abstract] |
Saturday, April 16, 2016 11:09AM - 11:21AM |
B17.00003: ABSTRACT WITHDRAWN |
Saturday, April 16, 2016 11:21AM - 11:33AM |
B17.00004: Search for the triboson WWW production at ATLAS Ismet Siral We present the first search for the triboson WWW production in the final state with two same-sign leptons and two jets using 20.3 fb$^{-1}$ of pp collision data taken at 8 TeV with the ATLAS detector. Triple and quartic gauge boson couplings exist in the Standard Model due to the non-Abelian gauge structure of the electroweak theory. This channel has the advantage of low SM backgrounds due to the requirement of two same-sign isolated leptons, high branching ratios due to the hadronic decay of one W boson, and signal region defined as two jets with the invariant mass close to the mass of the W boson. We present details for this analysis and show upper limits for the production cross section and anomalous quartic gauge couplings. [Preview Abstract] |
Saturday, April 16, 2016 11:33AM - 11:45AM |
B17.00005: $W$ Boson Mass Measurement with D0 Data Michelle Brochmann We present a measurement of the $W$ boson mass using D0 Run II data collected from proton and anti-proton collisions produced by the Tevatron at 1.96 TeV center of mass energy. We select $W\to e\nu$ events and use a template method to extract the $W$ boson mass from the distributions of the electron transverse momentum, missing transverse energy as a proxy for the transverse momentum of the neutrino, and the transverse mass of the $e\nu$ system. A sample of $Z$ boson events is used for calibration and the analysis is blinded. Analysis methodology and status will be discussed. [Preview Abstract] |
Saturday, April 16, 2016 11:45AM - 11:57AM |
B17.00006: Measurement of the W Boson Helicity Fractions in $t\bar{t}$ Events at $\sqrt{s}$=8 TeV in the Lepton+Jets Channel with ATLAS Benjamin Tannenwald, Mohammad Kareem, Harris Kagan, Boris Lemmer, Elizaveta Shabalina, Maria Moreno Llacer, Arnulf Quadt The relative fractions of longitudinally, left-handed, and right-handed polarized W bosons produced in lepton+jets $t\bar{t}$ decays are measured using proton-proton collisions at a center-of-mass energy of 8 TeV as recorded in 2012 with the ATLAS detector at the LHC. The data sample corresponds to an integrated luminosity of 20.3 fb$^{-1}$. A kinematic fitting technique is used to reconstruct the final state objects, and the helicity fractions are obtained via a template fit to data. The helicity angle is calculated and the relative fractions computed simultaneously for both the leptonically and hadronically decaying W bosons. This represents the first-ever direct measurement of helicity fractions using hadronic W decays. Results from orthogonal signal regions are combined to increase the overall sensitivity of the final measurement. The extracted helicity fractions are then compared to NLO predictions from the Standard Model. [Preview Abstract] |
Saturday, April 16, 2016 11:57AM - 12:09PM |
B17.00007: Thermal corrections to Electroweak Decays Samina Masood We study the electroweak processes at finite temperatures. This includes the decay rates of electroweak gauge bosons and beta decays. Major thermal corrections come from QED type radiative corrections. Heavy mass of the electroweak gauge bosons helps to suppress the radiative corrections due to the electroweak gauge boson loops. Therefore, dominant thermal corrections are due to the photon loops. We also discuss the relevance of our results to astrophysics and cosmology. [Preview Abstract] |
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