Bulletin of the American Physical Society
Joint Spring 2012 Meeting of the Texas Sections of the APS and AAPT and Zone 13 of the SPS
Volume 57, Number 2
Thursday–Saturday, March 22–24, 2012; San Angelo, Texas
Session C2: Contributed Oral Presentations: APS 2 |
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Chair: Carlos Bertulani, Texas A&M University at Commerce Room: Houston Harte University Center UC 201 |
Friday, March 23, 2012 10:30AM - 10:42AM |
C2.00001: Constraints on Low-Mass WIMP signals from CDMS Kunj Prasad Dark Matter constitutes more than 80{\%} of matter content in known universe. A major candidate to Dark Matter is Weakly Interacting Masive Particle (WIMP). The Cryogenic Dark Matter Search (CDMS) experiment uses cryogenically cooled Germanium detectors to look for recoil signals with the slow moving WIMPs in our galaxy. The most recent results optimized for high mass WIMPs yielded 2 possible candidates, which were statistically consistent with expected background. An updated analysis optimized for low mass WIMP search showed no evidence of low mass WIMPs and disfavors an explanation for the DAMA/LIBRA and CoGeNT signals in terms of spin-independent elastic scattering of low-mass WIMP. Search for annual modulation of our data shows no strong evidence of possible WIMP signature, and rejects the observation of similar phenomenon in CoGeNT at more than 95{\%} confidence level. The next generation SuperCDMS experiment utilizing more advanced detector technology is expected to have much higher sensitivity for WIMP search with very little expected background. [Preview Abstract] |
Friday, March 23, 2012 10:42AM - 10:54AM |
C2.00002: CDMS WIMP detector Fabrication Optimization Andrew Jastram Less than 20{\%} of the matter content in the Universe is made up of what we know as ordinary matter, the rest is dominated by Dark Matter. The major candidate constituent of Dark Matter is the Weakly Interacting Massive Particle (WIMP). The Cryogenic Dark Matter Search (CDMS) experiment uses photo-lithographically patterned Ge detectors with Transition Edge Sensors (TES) that are operated at 50mK temperature, to look for possible recoil with the slow moving WIMPs in our galaxy. This talk will present recent advances in the detector technology with a new dedicated nano-fabrication facility set up at Texas A{\&}M University. [Preview Abstract] |
Friday, March 23, 2012 10:54AM - 11:06AM |
C2.00003: Characterization of GEM Digital Hadron Calorimeter with 13 bit KPiX Readout System Using Particle Beams Safat Khaled The High Energy Physics Group at the University of Texas at Arlington has been developing a digital hadron calorimeter (DHCAL) for future linear colliders using double-layer Gas Electron Multiplier (GEM) detector in the sensitive gap. The group has built prototype double GEM detectors in several sizes and have exposed four 30cm x 30cm prototype GEM detectors to particle beams at Fermi National Accelerator Laboratory. One of these detectors utilized a 13 bit KPiX chip and its accompanying read out system developed at the Stanford Linear Accelerator Center. This talk will present the results of the beam test data analysis to understand the characteristics and performance of the prototype detectors. More specifically, it will present the measured gain, response, and efficiency of the detectors as well as the dependence of these quantities on the ambient pressure, position at which the particle passes through the detector and the applied high voltage. [Preview Abstract] |
Friday, March 23, 2012 11:06AM - 11:18AM |
C2.00004: Study of systematic uncertainties for Higgs Boson Searches in $H\rightarrow \gamma \gamma$ and $H\rightarrow W^{+}W^{-} \rightarrow l^{+} \nu l^{-} \nu$ Final States in ATLAS Hee Yeun Kim, Jaehoon Hu This study focuses on the theoretical systematic uncertainties for Higgs particle searches in $H\rightarrow \gamma \gamma$ and $H\rightarrow W^{+}W^{+} \rightarrow l^{+} \nu l^{-} \nu$ channels at ATLAS and for background processes. The precision of Monte Carlo event generator predictions benefit dramatically from the inclusion of higher-order corrections in various ways in total and differential cross sections. In this study, two different combinations of Monte-Carlo tools, PowhegBox-Pythia and PowhegBox-Herwig, are used with various Parton Distribution Function sets in CTEQ6.6 and MSTW2008NLO for systematic uncertainties resulting from parton showering and PDF uncertainties. Large scale Monte-Carlo event simulations have been performed to estimate the background. Cut based analyses have been done and theoretical predictions have been compared to the 2011 ATLAS data. This enables us to understand the underlying parton dynamics in the processes, and to quantify the theoretical systematic uncertainties in background estimates and Higgs signal cross sections. [Preview Abstract] |
Friday, March 23, 2012 11:18AM - 11:30AM |
C2.00005: Search for NMSSM Higgs production with the CMS detector Aysen Tatarinov Light bosons weakly coupling to the Standard Model may appear in the context of Next-to-Minimal Supersymmetric Standard Model (NMSSM), which could resolve the tension between direct and indirect measurements of the Higgs mass. We present a search for the lightest CP-even Higgs boson (h1) decaying into two lightest CP-odd Higgs bosons (a1), followed by their decays into two pairs of collimated muons in the NMSSM. The search covers the lightest CP-odd Higgs boson (a1) mass from 0.25 to 3.5 GeV/c2 and sets upper limit on NMSSM Higgs boson production (sigma*B). It was performed using pp collisions data recorded by the CMS experiment at the LHC, at center-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 4.9 fb$^{-1}$. [Preview Abstract] |
Friday, March 23, 2012 11:30AM - 11:42AM |
C2.00006: Measurement of properties of the Z and W bosons from the ATLAS experiment Last Feremenga, Jaehoon Yu We present the results from a study of the kinematic properties of the W and Z bosons produced in proton-proton collisions at the Large Hadron Collider at the European Center for Nuclear and Particle physics, CERN, Geneva, Switzerland. In particular, we present the measured mass distribution of these two particles from the most current data from the ATLAS experiment, and compare them with the theoretical predictions. Although the properties of the Z boson are very well known, those of the W boson are known to uncertainties of about ten times that of the Z bosons. Improved results of W and Z boson properties are presented. [Preview Abstract] |
Friday, March 23, 2012 11:42AM - 11:54AM |
C2.00007: Current Progress in Fabrication of a 14 Tesla Nb$_{3}$Sn Dipole Eddie Holik III, Christopher Benson, Kyle Damborsky, Nick Diaczenko, Tim Elliott, Ray Garrison, Andrew Jaisle, Alfred McInturff, Peter McIntyre, Dior Sattarov The Accelerator Technology Laboratory at Texas A{\&}M is fabricating a model dipole magnet, TAMU3, designed to operate at a 14 Tesla bore field. The dipole employs an advanced internal-tin Nb$_{3}$Sn/Cu composite strand with enhanced current density. The coils must be processed through a heat treatment after winding, during which the Sn within the heterogeneous strands diffuse into the Cu/Nb matrix to form high-performance superconducting layers. Heat treatment of the first coil assembly revealed tin leakage from the Sn cores that was caused by omission of a pre-anneal step in the heat treatment. We are evaluating the electrical properties of the coil, the microstructure and short-sample superconducting performance of cut-off samples of current leads to determine the extent of damage to the performance of the windings. Results of those tests and plans for construction of TAMU3 will be presented. [Preview Abstract] |
Friday, March 23, 2012 11:54AM - 12:06PM |
C2.00008: Search for high-mass di-tau resonances in pp collisions at $\sqrt{s}$=7 TeV Indara Suarez Many well motivated scenarios of physics beyond the Standard Model, such as Grand Unified Theories, models with extra spatial dimensions, and Super symmetry (SUSY) suggest the presence of heavy neutral resonances. While these new particles may have different nature and production mechanism, e.g. heavy SUSY Higgs, Z'-boson or Kaluza-Klein excitations, they all share a similar experimental signature which should be observable at the LHC using dilepton final states. We present a direct search for heavy particles decaying into two taus using data from pp collisions recorded by the CMS experiment at the LHC, at center-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 4.6 fb$^{-1}$. The cross section limit was measured using four channels, Z'$\to \tau \tau \to $e$\tau _{h}$, $\mu \tau _{h}$,e$\mu $, and $\tau _{h}\tau _{h}$, where no significant excess was observed. Using the Sequential Standard Model Z'-boson as a benchmark, we set a 95{\%} confidence-level upper limit on the mass of 1TeV. [Preview Abstract] |
Friday, March 23, 2012 12:06PM - 12:18PM |
C2.00009: Search for Supersymmetry Angel Campoverde The Standard Model (SM) describes electromagnetic, weak and strong interactions in an almost satisfactory way. However it cannot be the ultimate theory of nature because it does not describe gravitational forces, it cannot explain neutrino oscillations and needs to be forced to give the right mass to the Higgs boson, of which I will talk. There are models that try to expand the SM to solve these problems. One of these is Supersymmetry (SUSY). I will talk about the WZ model, a toy model that describes a system of four particles with a Supersymmetric Lagrangian, I will talk about its key features and how it solves the problems stated before. I will also talk about a particular way in which SUSY can be broken, General Gauge Mediation, and the way how we can use it to search for SUSY particles. Finally I will talk about experimental data related with the search for SUSY. [Preview Abstract] |
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