Bulletin of the American Physical Society
79th Annual Meeting of the APS Southeastern Section
Volume 57, Number 16
Wednesday–Saturday, November 14–17, 2012; Tallahassee, Florida
Session GA: Results from LHC II |
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Chair: Laura Reina, Florida State University Room: DoubleTree Ballroom |
Friday, November 16, 2012 8:30AM - 8:42AM |
GA.00001: Physics at the Tevatron in the LHC Era Invited Speaker: Trang Hoang The Tevatron is now the second-highest-energy collider in the world. However, there are still many Tevatron measurements that are competitive with or better than those currently done at the LHC. I will discuss some of these analyses. [Preview Abstract] |
Friday, November 16, 2012 8:42AM - 8:54AM |
GA.00002: The LHC and New Physics Beyond the Standard Model Invited Speaker: Konstantin Matchev This talk will review several scenarios for new physics beyond the standard model and the current status of the corresponding searches at the LHC. [Preview Abstract] |
Friday, November 16, 2012 8:54AM - 9:06AM |
GA.00003: Visualizing the Matrix Element Method James Gainer, Konstantin Matchev The Matrix Element Method (MEM) is an increasingly popular technique in experimental particle physics. In this method, the squared matrix elements for producing the observed final state using various hypotheses, such as a signal hypothesis and a background hypothesis, are calculated. The resulting matrix elements can be used to quantify when events are more ``signal-like'' or ``background-like,'' thus allowing more sensitive searches for new physics. We provide an introduction to this method. We then demonstrate a simple interpretation of signal and background matrix elements, which is appealing visually and may inspire novel searches for new physics. [Preview Abstract] |
Friday, November 16, 2012 9:06AM - 9:18AM |
GA.00004: Caustics for High-Precision Mass Measurement and its application to W \& Higgs Won Sang Cho, Konstantin Matchev We introduce a mixed events variable called ``Mass Caustics'' $\tilde{M}$ for measuring the masses of resonant particles. By its construction, the mass caustics $\tilde{M}$ has a super-sharp singular peak structure which generalizes the ordinary invariant and transverse masses while preserving the Lorentz boost invariance of resonance mass peak positions. In result, the information on the mass peak position is statistically amplified in compared to the variables at present, and high precision mass measurement can be achieved. Such precision of mass spectrometry opens the door to numerous applications in the fields dealing with relativistic particles, in particular when parts of the relic particles are invisible with limited event statistics. We demonstrate this technique for mass measurement of the W and Higgs bosons which decay with missing neutrino. [Preview Abstract] |
Friday, November 16, 2012 9:18AM - 9:30AM |
GA.00005: Parton distributions and the W mass measurement Seth Quackenbush, Zack Sullivan Errors arising from parton distributions are the dominant source of theoretical error in the W mass measurement at the Tevatron and LHC. With the large W cross section and steadily rising LHC luminosity, parton distributions are expected to become the limiting factor in measuring the W mass at the LHC. We examine the origins of these errors and discuss methods to minimize them. Naive theoretical analyses dramatically underestimate the error, primarily due to the influence of showering and detector resolution on shape of the W transverse mass distribution. [Preview Abstract] |
Friday, November 16, 2012 9:30AM - 9:42AM |
GA.00006: Search for a Fourth Generation Top-Like Quark with Single Charged Lepton Final States in 7 TeV pp Collisions Charles Jenkins The CMS Experiment at the LHC recorded 7 TeV center of mass energy pp collisions in the 2011 run. One search conducted in this data was for a fourth generation top-like quark decaying as: t' $\to $ W b. A fourth generation is disfavored by a 125 GeV Standard Model Higgs boson, which is consistent with the observation of a new Higgs-like boson at 125 GeV at the LHC. However, extended Higgs theories allow t' quarks and there are other models with non-chiral top-like quarks that have similar decay signatures used in this search. This analysis searches for strong top-like quark production which decay into Wb, where one of the W bosons decays leptonically (W$\to $l$\nu )$, the other hadronically (W$\to $q qbar). This analysis studies two channels: $\mu +$jets and electron$+$jets. Results from a sample of 4.9 fb$^{-1} \mu +$jets and 5.0 fb$^{-1}$ electrons$+$jets will be presented. [Preview Abstract] |
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