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 K5: Experimental High Energy Physics |
Hide Abstracts |
Chair: Elliott Cheu, University of Arizona Room: UA Student Union Presidio |
Saturday, October 22, 2011 8:30AM - 8:42AM |
K5.00001: Measurement of the Properties of $\Sigma _{b}^{(\ast )\pm }$ with the CDF II Experiment Prabhakar Palni I will present a measurement of the masses and natural widths of the four bottom baryon resonance states $\Sigma _{b}^{+}$, $\Sigma _{b}^{\ast +}$ and $\Sigma _{b}^{-}$, $\Sigma _{b}^{\ast - }$ reconstructed in the $\Lambda ^{0}_{b}\pi ^{+}$ and $^{ }\Lambda ^{0}_{b}\pi ^{-}$ decay modes, respectively. This analysis is based upon the data taken with proton anti-proton collisions at 1.96 TeV recorded by the CDF II detector for a total integrated luminosity of 6 fb$^{-1}$. A heavy baryon with two light quarks and a single heavy quark can be described as the helium atom of QCD. The heavy quark in the baryon may be used as a probe of confinement which will allow us to study non-perturbative QCD in a new regime. The natural widths of the states $\Sigma _{b}^{\pm }$ and $\Sigma _{b}^{\ast \pm }$ have been measured for the first time. The signal shape is modeled with a non-relativistic P-Wave Modified Breit- Wigner function. [Preview Abstract] |
Saturday, October 22, 2011 8:42AM - 8:54AM |
K5.00002: Measurement of the Top-Pair Differential Cross Section with pp Collisions at sqrt(s) = 7 TeV at ATLAS R. Matt Leone The top quark mass, being near the electroweak symmetry breaking scale, plays a vital role in many beyond the standard model (BSM) theories. These theories predict exotic particles decaying into top quark pairs. A precise measurement of the differential cross section with respect to the top-pair invariant mass could constrain such models and simultaneously test the perturbative QCD for heavy quark production. We present the status of such a measurement with 1/fb of data at sqrt(s) = 7 TeV collected by the ATLAS experiment. The measured cross section as a function of the invariant mass is unfolded and corrected for detector resolution, efficiency and acceptance in order to facilitate direct comparison with theoretical predictions. We discuss the unfolding strategy and show the comparisons of SM expectation and those observed in data. [Preview Abstract] |
Saturday, October 22, 2011 8:54AM - 9:06AM |
K5.00003: Searching for Top Quark Pair Resonances using Boosted Top Jets in the Lepton Plus Jets Channel using pp Collisions at sqrt(s) = 7 TeV with ATLAS Sam Silva We present results from a search for $t\bar{t}$ pair resonances using boosted top quark pairs produced by the ATLAS experiment in pp collisions at $\sqrt{s}$ = 7 TeV. Selection criteria and $t\bar{t}$ pair reconstruction using boosted top decays are described. We present the observed and expected numbers of Standard Model processes and compare basic kinematic distributions. Prospects for production limits of leptophobic topcolor $Z^{\prime}$ and Randall-Sundrum Kaluza-Klein gluons are given. [Preview Abstract] |
Saturday, October 22, 2011 9:06AM - 9:18AM |
K5.00004: Searching for t-tbar Resonances in the Lepton plus Jets Channel using pp Collisions at sqrt(s) = 7 TeV with ATLAS Fionnbarr O'Grady We present results from a search for t-tbar pair resonaces in the lepton plus jets final state using data from the ATLAS experment in pp collisions at root{s} = 7 TeV. This search makes use of b-tagging in order to reduce the W plus jet background and a kinematic fitter to improve the t-tbar mass resolution. Prospects for limits of leptophobic topcolor Z' and Randall-Sundrum Kaluza-Klein gluons are given. [Preview Abstract] |
Saturday, October 22, 2011 9:18AM - 9:30AM |
K5.00005: SUSY Searches at ATLAS in Multilepton Final States with Jets and Missing Transverse Energy Caleb Lampen The Large Hadron Collider (LHC) is home to the most energetic pp collisions in the world today, making it the premier location to perform direct searches for Beyond the Standard Model (BSM) physics such as Supersymmetry (SUSY). We present a search, using the ATLAS detector at the LHC, for SUSY with a final state signature of at least three leptons, moderate missing transverse energy, and multiple jets. These multilepton SUSY modes do not receive much background contribution from Standard Model process, and thus serve as powerful probes of BSM physics. [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