Bulletin of the American Physical Society
2011 Annual Meeting of the Four Corners Section of the APS
Volume 56, Number 11
Friday–Saturday, October 21–22, 2011; Tuscon, Arizona
Session E5: Theory and Methods in High Energy Physics |
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Chair: Kenneth Johns, University of Arizona Room: UA Student Union Presidio |
Friday, October 21, 2011 3:25PM - 3:37PM |
E5.00001: Development of a proton/muon discrimination algorithm to investigate neutrino-nucleon elastic scattering in the P{\O}D Daniel Ruterbories The PiZero sub-detector (P{\O}D) of the T2K off-axis near detector ND280 is used to measure neutrino interactions and beam properties. The measurement of neutrino-nucleon elastic scattering requires a robust contained-track particle identification (PID) algorithm to indentify protons while rejecting the large background of muons and pions from other neutrino interaction channels. I will give a brief description of the P{\O}D, an overview of neutrino interactions, and then a description of the method and performance of this discrimination algorithm. [Preview Abstract] |
Friday, October 21, 2011 3:37PM - 3:49PM |
E5.00002: Precision determination of $\alpha_S(m_Z)$ from thrust data Riccardo Abbate, Michael Fickinger, Andr\'e Hoang, Vicent Mateu, Iain Stewart I will present an extraction of the strong coupling constant, $\alpha_S(m_Z)$, from thrust data using Effective Field Theory techniques. Our calculation yields one of the most precise measurements of $\alpha_S(m_Z)$ to date. We perform a simultaneous two parameter fit to all available data at energies $Q=35$ GeV to $207$ GeV. We find $\alpha_s(m_Z)=0.1135 \pm (0.0002)_{\rm expt} \pm (0.0005)_{\rm hadr} \pm (0.0009)_{\rm pert}$, with $\chi^2/{\rm dof}=0.91$, where the displayed $1$-sigma errors are the total experimental uncertainty, the hadronization uncertainty, and the perturbative theory uncertainty, respectively. [Preview Abstract] |
Friday, October 21, 2011 3:49PM - 4:01PM |
E5.00003: Improving the Slepton Reach through Cascade Decay at the LHC Jonathan Eckel, Shufang Su, William Shepherd LHC studies on the slepton sector have mostly been focused on direct slepton Drell-Yan pair production. We analyzed the case when the left-handed sleptons are lighter than winos and can appear in the on-shell decay of those particles. The invariant mass of the lepton pairs, $M_{\ell\ell}$, from the neutralino decay has a distinctive triangle shape with a sharp cutoff. We discuss the utilization of the triangle shape in the $M_{\ell\ell}$ distribution to identify the slepton signal. We studied the trilepton signal and obtained the $\sigma \times {\rm BR} \times {\rm acceptance}$ that is needed for a 5 $\sigma$ discovery as a function of the cutoff mass for the LHC with center of mass energy 14 TeV and 100 ${\rm fb}^{-1}$ integrated luminosity. Our results are model independent such that they could be applied to other models with similar decay topology. When applied to the MSSM case, it is found that with 30 (100) ${\rm fb}^{-1}$, the left-handed slepton mass of about 500 (600) GeV could be reached, which extends far beyond the slepton mass reach in the usual Drell-Yan study. [Preview Abstract] |
Friday, October 21, 2011 4:01PM - 4:13PM |
E5.00004: Soliton Creation with a Twist Tanmay Vachaspati We consider soliton creation when there are ``twist'' degrees of freedom present in the model in addition to those that make up the soliton. Specifically we consider a deformed O(3) sigma model in 1+1 dimensions, which reduces to the sine-Gordon model in the zero twist sector. We study the scattering of two or more breather solutions as a function of twist, and find soliton creation for a range of parameters. We speculate on the application of these ideas, in particular on the possible role of magnetic helicity, to the production of magnetic monopoles, and the violation of baryon number in nuclear scattering experiments. [Preview Abstract] |
Friday, October 21, 2011 4:13PM - 4:25PM |
E5.00005: There may be a CPT violation at a Horizon that could affect Particle Creation Richard Kriske Relativistic Physics has three observers when viewed in Quantum Mechanics. A Photon carries information in a clock mechanism according to QED, which can be viewed as a third observer and as an internal, hidden variable. In QED, the clock mechanism is used to determine the phase, perhaps the clock has more than one hand, say a second hand and a minute hand. The second hand keeps track of Phase, but the minute hand keeps track of the time normal at the point the Photon was created. If the Photon was created near the horizon of the Universe, even if it where a high frequency, Blue Photon, in Observer 1s frame of reference, it would be a Red Photon in Observer 2s frame of reference, far from the Horizon. In flat space two Observers will work, in that they both view Space-Time. If space is curved, there is a problem, in that like the Earth's two dim. surface reduces to a one dimensional line, the Universes three dim. surface gives a two dimensional surface, with a force outward in every direction. At the Horizon the Space-Time symmetry is broken into Space and Time, with the Past being seen in every direction outward. This one direction for Time at the Horizon breaks CPT and could be responsible for the Electroweak Force, and would most certainly produce a Gauge Field everywhere in the Universe, that could be the Higgs Mechanism. Black Hole Horizons may be similar and Photons tunneling out of them would have mass. [Preview Abstract] |
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