Bulletin of the American Physical Society
2012 Annual Fall Meeting of the APS Prairie Section
Volume 57, Number 14
Thursday–Saturday, November 8–10, 2012; Lawrence, Kansas
Session B1: High Energy and Nuclear Physics I |
Hide Abstracts |
Chair: Michael Murray, University of Kansas Room: Oread Hotel Hancock Room |
Friday, November 9, 2012 10:40AM - 11:15AM |
B1.00001: Investigating the Quark Gluon Plasma with Heavy Ion Collisions Invited Speaker: Scott Pratt By colliding heavy ion collisions at high energies, mesoscopic regions are created with temperatures near $4\times 10^{12}$ Kelvin. At these temperatures, protons and other hadrons melt and the quark-gluon plasma (QGP) is created. The transient state exists for less than $10^{-22}$ seconds before cooling and disassociating. Experiments at the Relativistic Heavy Ion Collider and at the LHC record the tracks of the thousands of outgoing hadrons and electromagnetic particles in a single event. I will provide a few examples of how chemical and bulk properties of the QGP can be extracted by comparing sophisticated models of the collision to data. [Preview Abstract] |
Friday, November 9, 2012 11:15AM - 11:27AM |
B1.00002: Where and How to Find Strong Parity and CP Violation John Ralston Testing strong CP symmetry in usually considered a task of low energy, high precision experiments. Meanwhile strong parity and CP symmetry at collider energies has not been adequately questioned, or tested. By constructing numerous new observables and a novel approach to high energy collider physics, we argue that strong CP violation can be discovered at existing facilities. Multiparticle data, when properly processed, can provide superb discovery tools. [Preview Abstract] |
Friday, November 9, 2012 11:27AM - 11:39AM |
B1.00003: Photoproduction of J/Psi in ultra-peripheral PbPb collisions at center-of-mass energy of 2.76 TeV in CMS Raymond Patrick Kenny III Ultra-peripheral collisions (UPCs) of heavy ions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius. At TeV energies, the strong electromagnetic field due to the coherent action of the Z$=$82 proton charges generates a large flux of photons, which can be used for high-energy photoproduction studies. Heavy vector mesons (for example J/psi, Psi', Upsilon) produced in electromagnetic interactions provide direct information on the parton distribution functions in the nucleus at very low values of Bjorken-x. These events are characterized by a very low hadron multiplicity. The wide pseudorapidity coverage of the CMS detectors is used to separate such events from very peripheral nuclear interactions. The CMS experiment has excellent capabilities for the measurement of the heavy vector mesons in the di-muon decay channel using the tracker and the muon chambers. This analysis demonstrates CMS's capabilities for measuring J/Psi in ultra-peripheral collisions. [Preview Abstract] |
Friday, November 9, 2012 11:39AM - 11:51AM |
B1.00004: Derivation of the Geometry of PbPb Collisions at 2.76 TeV Using Correlations between the Zero Degree Calorimeter Signal and Pixel Multiplicity Jeff Wood The geometry of PbPb collisions is derived using correlations from the zero degree calorimeter (ZDC) signal and pixel multiplicity at the Compact Muon Solenoid (CMS) Experiment using data from the heavy ion run in 2010. The method to derive the geometry takes the two-dimensional correlation between the ZDC and pixels and linearizes it for sorting events. A comparison to the current derivation of this geometry from the energy deposit in the forward hadronic calorimeter (HF) to the correlations in the ZDC versus pixels is made. This comparison highlights the similarities between the results of both methods in collisions with large nuclear overlap, as expected, and deviations in the results in collisions with smaller nuclear overlap. [Preview Abstract] |
Friday, November 9, 2012 11:51AM - 12:03PM |
B1.00005: The Evolution of Pixel Cluster Characteristics at CMS Will Burg A study of the behavior of the CMS Barrel Pixel Detector as a function of luminosity is presented. Variables such as the average cluster size and average cluster charge are examined from beam collision data gathered in 2011 and 2012. These are plotted versus the total integrated luminosity at the date of each corresponding run. From this, conclusions can be drawn about the effect of radiation on the detector with time. [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