Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session M16: Electroweak Physics |
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Sponsoring Units: DPF Chair: Tao Han, University of Pittsburgh Room: Key 12 |
Sunday, April 12, 2015 3:30PM - 3:42PM |
M16.00001: $W$ 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 $W \rightarrow e\nu$ 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] |
(Author Not Attending)
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M16.00002: $Z$ boson rapidity distribution for $p\bar{p} \rightarrow Z/\gamma^{*} \rightarrow e^{+}e^{-} + X$ events at a center-of-mass energy of 1.96 TeV Pengfei Ding We present a measurement of the shape of the Z boson rapidity distribution for $p\bar{p} \rightarrow Z/\gamma^{*} \rightarrow e^{+}e^{-} + X$ events at a center-of-mass energy of 1.96 TeV. Data collected with the D0 detector during the entire RunII period of the Fermilab Tevatron $p\bar{p}$ collider are used. By using these data with an integrated luminosity of up to $L = 9.86$ fb$^{-1}$, the uncertainties on the rapidity distribution in the forward region are significantly reduced compared with previous measurements. The measurement is made for events with electron-positron mass $66 < M_{ee} < 111$ GeV. Predictions of Next-to-Leading-Order(NLO) QCD theory with CTEQ and MSTW parton distribution functions are found to agree well with the data over the full rapidity range. [Preview Abstract] |
Sunday, April 12, 2015 3:54PM - 4:06PM |
M16.00003: Study of the inclusive four-lepton lineshape in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector at the LHC Bing Li The inclusive four-lepton lineshape is studied using data corresponding to $20.3$ fb$^{-1}$ of integrated luminosity from proton-proton collisions at $\sqrt{s}=8$ TeV at the LHC collected with the ATLAS detector. The mass spectrum is analyzed in the range $80$--$1000$ GeV, where several distinct physics processes contribute. These include the single resonant processes $qq\rightarrow Z\rightarrow 4\ell$, Higgs production $gg\rightarrow H\rightarrow ZZ^*\rightarrow 4\ell$, as well as continuum $ZZ$ production processes $qq\rightarrow ZZ^* 4\ell$ and $gg\rightarrow ZZ^* \rightarrow 4 \ell$. A total of $476$ four-lepton events are found in the signal region, allowing for a measurement of the total cross section, as well as the differential cross section versus the four-lepton invariant mass. In addition, the first measurement is made of the non-resonant gluon-gluon fusion component in the four-lepton mass region where both $Z$ bosons are produced on shell. [Preview Abstract] |
Sunday, April 12, 2015 4:06PM - 4:18PM |
M16.00004: The signal strength of CP-odd spin zero states in the Model of Electroweak-scale Right-handed Neutrinos at LHC Vinh Hoang, Ajinkya Kamat, Hung Pham We analyze and compute the signal strength of one CP-odd spin zero state in the model of electroweak scaled right-handed neutrinos ( $EW\nu_R$ ) model. The signal strength is investigated in various major channels at LHC, $\gamma\gamma$, VV, and b$\bar{b}$. With the high statistic in $\gamma\gamma$ channel, we can have an exclusive region, $130 \div 150 \;GeV$ for this CP-odd scalar. We also show an interesting decay mode which mimics WW process. From that, an upper limit for coupling of a singlet with right-handed doublets is imposed. [Preview Abstract] |
Sunday, April 12, 2015 4:18PM - 4:30PM |
M16.00005: Measurement of the $W+b\bar{b}$ Cross Section at CMS Thomas Perry The production of a W boson in association with a pair of b quarks is studied using proton-proton collisions at $\sqrt{s}=8$ TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 19.8 /fb. While previous experiments found tension between simulation and data when looking for a W boson plus at least one b quark, this study requires exactly two well separated b-tagged jets each with a transverse momentum pT$>25$ GeV and falling within the pseudorapidity range $|\eta|<2.4$. The W boson is identified by its decay to missing energy along with either an electron or a muon having pT$>30$ GeV and $|\eta|<2.1$. The cross section is computed from the unfolding of the reconstructed final-state objects to their corresponding generator-level definitions and comparisons are made between Madgraph+Pythia and MCFM using four-flavor and five-flavor schemes. [Preview Abstract] |
Sunday, April 12, 2015 4:30PM - 4:42PM |
M16.00006: Search for $WWW\rightarrow l\nu l\nu l\nu$ production in the ATLAS detector at $\sqrt{s} = 8$ TeV Alex Long This talk presents the status of a search for $WWW$ production in the fully leptonic final state using proton-proton collision data at $\sqrt{s} = 8$ TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. It represents one of the first searches to probe the Standard Model WWWW coupling directly at a collider. Many new models of beyond the Standard Model physics give rise to anomalous quartic qauge couplings to which this type of search could be sensitive. The fully leptonic channel provides the cleanest channel to look for such a process and is thus a promising channel for the first measurement of the $WWW$ production cross section. This includes WH associated Higgs boson production. An effective field theory approach is used for the interpretation of anomalous quartic gauge couplings. [Preview Abstract] |
Sunday, April 12, 2015 4:42PM - 4:54PM |
M16.00007: Search for Z decays into an electron and muon at CMS Nicholas Mucia We present the search for a Z boson decaying into an electron and a muon. This process is highly suppressed in the Standard Model and thus any observation would be strong evidence for new physics. This analysis uses $19.7 fb^{-1}$ of 8 TeV data taken at CMS in 2012. We normalize the events using $Z \rightarrow \mu\mu$ and $Z\rightarrow ee$ events which decreases systematic uncertainties and increases our sensitivity. The expected bounds of this decay are more sensitive than the current best limits. [Preview Abstract] |
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