Bulletin of the American Physical Society
Inaugural Fall 2009 Meeting of the Prairie Section of the APS
Volume 54, Number 17
Thursday–Saturday, November 12–14, 2009; Iowa City, Iowa
Session F1: Particle Physics I |
Hide Abstracts |
Chair: Robert Zwaska, Fermi National Accelerator Laboratory Room: IMU 335 (Iowa Room) |
Friday, November 13, 2009 11:30AM - 11:42AM |
F1.00001: Early Minimum Bias Physics at ATLAS Maaike Limper The Large Hadron Collider is expected to deliver the first collisions at end of this year. One of the first measurements by the ATLAS Collaboration will be the properties of the inelastic collisions: the central particle density and transverse momentum distributions. This talk will describe the ATLAS minimum bias triggers, the performance of the low transverse momentum track reconstruction and the precision with which the minimum bias distributions can be measured with early data. [Preview Abstract] |
Friday, November 13, 2009 11:42AM - 11:54AM |
F1.00002: Commissioning of the ATLAS Pixel Detector with Cosmic ray Data and readiness for collision Prafulla Behera The 80-million channel state-of-the-art Pixel Detector is the innermost sub-detector in the ATLAS experiment at LHC within a pseudorapidity coverage of 2.5. It plays a critical role in charged particle tracking and secondary vertex reconstruction with its characteristic high precision. The calibration and commissioning of the Pixel Detector were accomplished in situ in the ATLAS pit with cooling and detector control system. We present the performance of the Pixel Detector from analysis of the cosmic ray data to demonstrate that the detector is ready for collision and highlight where it will be vital in combination with the rest of the sub-detectors in some of the physics processes. The talk will show all aspects of detector opration, including the monitoring and safety system, the DAQ system and calibration procedures. [Preview Abstract] |
Friday, November 13, 2009 11:54AM - 12:06PM |
F1.00003: Quark and Lepton Mass Corrections in Neutrino-Nucleon Scattering Yu Seon Jeong, Mary Hall Reno We discuss the role of massive quark corrections for the neutrino-nucleon coross section at next-to-leading order in strong interaction corrections. The fixed flavor and variable flavor schems for treating massive quark corrections are compared numerically. The charged lepton mass corrections to the cross section are also discussed. [Preview Abstract] |
Friday, November 13, 2009 12:06PM - 12:18PM |
F1.00004: A Search for Charged Higgs in the decays of pair-produced top quarks at the Tevatron Diego Menezes, Supryia Jain, Dhiman Chakaborty, Mikhail Arov, Dookee Cho, Phillip Gutierrez, Haryo Sumowidagdo, Frederique Badaud, Florent Lacroix We present a search for charged Higgs bosons in the mass range $80 < m_{H^{\pm}} < 155$~GeV, assuming the decay $H^{+} \rightarrow \tau^{+} \nu_\tau$ (and its charge conjugate). Using 0.9~fb$^{-1}$ of lepton+jets data collected by the D0 detector, at the Fermilab Tevatron $p\bar{p}$ collider, we find no evidence for signal, and exclude branching ratios $B(t \rightarrow H^+b)$ at $95\%$ confidence level. [Preview Abstract] |
Friday, November 13, 2009 12:18PM - 12:30PM |
F1.00005: High Energy Leptons from Muons in Transit Alexander Bulmahn, Mary Hall Reno We use a new formalism developed in our previous work to numerically evaluate the differential cross section for lepton pair production from muons in transit through rock or ice. This formalism gives better results than the approximate formulas in the literature for a large range of momentum transfers and lepton mass. The differential cross section is used to calculate underground lepton fluxes from an incident atmospheric muon flux, considering contributions from both conventional and prompt fluxes. Neutrino production of leptons is also considered. We provide a new analytic approximation for the charge current differential neutrino cross section. Comparisons of muon induced and neutrino induced electrons and taus are made for underground detectors. [Preview Abstract] |
Friday, November 13, 2009 12:30PM - 12:42PM |
F1.00006: Generalized bumblebee models and Lorentz-violating electrodynamics Michael Seifert The breaking of Lorentz symmetry via a dynamical mechanism, with a tensor field which takes on a non-zero expectation value in vacuum, has been a subject of significant research activity in recent years. In certain models of this type, the perturbations of the ``Lorentz-violating field'' about this background may be identified with known forces. I present the results of applying this interpretation to the ``generalized bumblebee models'' found in a prior work. In this model, the perturbations of a Lorentz-violating vector field can be interpreted as a photon field. However, the speed of propagation of this ``bumblebee photon'' is direction-dependent and differs from the limiting speed of conventional matter, leading to measurable physical effects. Bounds on the parameters of this theory can then be derived from resonator experiments, accelerator physics, and cosmic ray observations. [Preview Abstract] |
Friday, November 13, 2009 12:42PM - 12:54PM |
F1.00007: Muon veto system and backgrounds of the DayaBay experiment Brandon Seilhan The DayaBay reactor neutrino experiment aims to measure the last unknown neutrino mixing angle $\theta_{13}$. To reach our goal sensitivity of $\sin^22\theta_{13}<0.01$ we must identify and veto cosmic ray induced backgrounds at each of our three detector sites. The DayaBay experiment combines a water Cherenkov detector with RPCs to tag muons with an overall efficiency exceeding 99.5\%. This talk will provide an overview of the DayaBay muon veto system and potential cosmic ray induced backgrounds. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700