Bulletin of the American Physical Society
2005 7th Annual Meeting of the Northwest Section
Friday–Saturday, May 13–14, 2005; Victoria, BC, Canada
Session B2: Particles I |
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Chair: Alan Astbury, University of Victoria Room: MacLaurin D101 |
Friday, May 13, 2005 2:00PM - 2:36PM |
B2.00001: Recent physics results at D\O Invited Speaker: The Fermilab Tevatron is the world's highest-energy particle accelerator, colliding protons and antiprotons at $\sqrt{s}=1.96$~TeV. With more than 0.6~fb$^{-1}$ of $p\bar{p}$ collisions delivered in Run II, the D\O\ collaboration is reporting results from its very broad physics program. The top quark is being studied intensely. The production cross section of $t\bar{t}$ pairs as well as the top quark mass and helicity are measured. World's best limits are set in the search for single top production. Higgs search results and searches for signs of physics beyond the standard model are presented. New constraints are set on scenarios including ideas such as supersymmetric particles or large extra dimensions (LED) but so far no evidence for Higgs bosons or new physics has been found. Weak boson production cross sections, associated production with a photon and diboson production measurements are reported. $B$-physics has become an integral part of the Run II program at D\O. Results include observation of resonances and measurement of lifetimes in the $B_d$ and $B_s$ systems. [Preview Abstract] |
Friday, May 13, 2005 2:36PM - 3:12PM |
B2.00002: Recent CP Results from BABAR Invited Speaker: The BaBar experiment has accumulated $\sim $230 fb$^{-1}$ of e$^{+}$e$^{-}$ collision data at or near the $\Upsilon $(4s) from SLAC's PEP-II collider. The currently analyzed data provides samples of ${\rm O}$(10$^{8})$ B$^{0}$B$^{0 }$ events. We will report on the results of recent CP asymmetry measurements from Babar, including the observation of direct CP violation in the B$^{0}\to $K$^{+} \quad \pi ^{-}$ decay. [Preview Abstract] |
Friday, May 13, 2005 3:12PM - 3:37PM |
B2.00003: COFFEE BREAK
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Friday, May 13, 2005 3:37PM - 3:49PM |
B2.00004: Search for Electroweak Top Quark Production Thomas Gadfort We present a search for Single Top Quark production at the Tevatron D{\O} Detector using 230 pb-1 of data taken at $\sqrt{s}$ = 1.96 TeV. Single top quark production is a unique place to directly measure the Vtb CKM matrix element and also a possible window on physics beyond the standard model. A description of the D{\O} detector, details of the analysis and selection, and systematic errors will be presented. Finally, future plans and prospects will be presented. [Preview Abstract] |
Friday, May 13, 2005 3:49PM - 4:01PM |
B2.00005: A Search for Single Top at DZERO using a Decision Tree based Analysis Gordon Watts The DZERO experiment has recently completed a search for Single Top Quark production. The Single Top signal consists of a lepton, jets, and missing energy; its largest background is W Boson Production in addition to jets. DZERO employed a variety of techniques to separate signal from the W + Jets background. This presentation describes the Decision Tree technique. We will discuss the limits obtained on Single Top production using Decision Trees and compare them to those obtained using Neural Network technique. Finally, we will discuss future improvements to the technique. [Preview Abstract] |
Friday, May 13, 2005 4:01PM - 4:13PM |
B2.00006: Anomalous Hydrodynamics and Magnetohydrodynamics George Newman Our goal is to examine the role of anomalies in the hydrodynamic regime of field theories. We employ methods based on gauge/gravity duality to examine R-charge anomalies in the hydrodynamic regime of strongly t'Hooft coupled, large $N$, $\mathcal{N}=$ 4 SYM. We use a quasiparticle treatment based on the familiar ``level-crossing" picture of chiral anomalies to investigate thermalized massless QED. In each case we find the same result. Regardless of whether a particular current is anomalously non-conserved or not, as long as it participates in an anomalous 3-pt. correlator, its constitutive relation recieves a new term: \(\vec{j}^{a} \propto - d^{abc}\vec{B}^{b}\rho^{c}\). We include a general argument for the presence of such terms, based on the formulation of hydrodynamics as an effective classical field theory. [Preview Abstract] |
Friday, May 13, 2005 4:13PM - 4:25PM |
B2.00007: Resolution Studies of a GEM-TPC in a High Magnetic Field Gabe Rosenbaum, Dean Karlen, Paul Poffenberger The University of Victoria detector research team has been testing a prototype for an inner tracker for use at the proposed International Linear Collider. This detector must be capable of attaining excellent momentum resolution (which translates into needing excellent spatial resolution). The University of Victoria's prototype detector is a Time Projection chamber (TPC). A TPC uses a pad array to collect ionization tracks, as well as timing information to reconstruct tracks of charged particles in three dimensions. Our detector uses gas electron multipliers (GEMs) for electron gain in the gas. Tests over the last two years have been conducted to determine the detector's capabilities. For these tests the chamber was operated in a high magnetic field while reconstructing cosmic ray tracks. Tests were done at TRIUMF (Vancouver) using a 1 tesla solenoid and at DESY (Hamburg) using a 5 tesla superconducting magnet. A UV laser system was also designed and built to aid in calibration and in assessing systematics. The results of these tests will be presented demonstrating the excellent tracking resolution of a GEM-TPC. [Preview Abstract] |
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