Bulletin of the American Physical Society
2006 Ohio Section of the APS Spring Meeting
Friday–Saturday, March 31–April 1 2006; Detroit, Michigan
Session S4: Nuclear Physics, Particle Physics and Astrophysics |
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Chair: Sean Gavin Room: McGregor Center BC |
Saturday, April 1, 2006 8:00AM - 8:12AM |
S4.00001: Elliptic flow of thermal photons in relativistic heavy ion collisions using hydrodynamics Evan Frodermann The elliptic flow $v_2$ of particles is one of the significant signatures of a thermally expanding fireball in off-central relativistic heavy ion collisions. Typically, $v_2$ is calculated for particles such as pions which decouple from the thermal medium at late times. Photons, however, decouple from the medium upon creation, carrying information for the full fireball duration, particularly information about the early QGP phase. We explore the elliptical flow of photons from Au+Au collisions, using an ideal hydrodynamical model to describe the collision. We show that the $p_T$ dependence of photon elliptical flow is quite different from that of hadrons, in that it decreases at high $p_T$, reflecting the weak elliptic flow during the early collision stages (whereas the hadronic elliptic flow reflects the late collision stage and increases with $p_T$). [Preview Abstract] |
Saturday, April 1, 2006 8:12AM - 8:24AM |
S4.00002: Gluon saturation effects in relativistic U+U collisions Anthony Kuhlman We examine the entropy production in relativistic U+U collisions using a Color Glass Condensate type picture as the basis for our calculations. In this framework, we find that the peak entropy produced in tip-on-tip uranium collisions is approximately 30\% greater than that seen in central Au+Au. We show that while the resulting difference in the charged particle multiplicity from tip-on-tip versus side-on-side collisions predicted by the Kharzeev-Levin-Nardi (KLN) model is smaller than that predicted in our previous Glauber model estimates, it is still large enough to allow for experimental discrimination between average orientations of the uranium nuclei, and illustrate this with results from a Monte Carlo simulation. [Preview Abstract] |
Saturday, April 1, 2006 8:24AM - 8:36AM |
S4.00003: Coincidence Electron-Deuteron Scattering at GeV Energies Sabine Jeschonnek In this talk, I will present some recent theoretical developments in the description of high energy coincidence electron scattering from light nuclei. New data on D(e,e$'$p)n scattering at GeV energies have recently been taken at Jefferson Lab in Newport News, VA. Coincidence scattering from the deuteron offers the best chance to understand the reaction mechanism and to develop appropriate methods to describe it. A careful analysis of the final state interaction is crucial to understand the forthcoming data and to study features of the nuclear ground state. I will briefly discuss what we can learn from the different observables. [Preview Abstract] |
Saturday, April 1, 2006 8:36AM - 8:48AM |
S4.00004: Full Reconstruction of Charged Hadrons Correlated With High $p_T$ $h^{\pm}$, $\pi^{+}, \pi^{-}, p$, and $\bar{p}$ from STAR Jason Ulery Soft-hard angular correlations show that lost energy at high
$p_T$ is distributed to low $p_T$ and away side correlated
hadrons are partially thermalized with the bulk medium. In this
talk we present $\Delta\phi$ and $\Delta\eta$ correlations of
charged hadrons in $p_T>0.15$ GeV/c with trigger hadrons of
$p_T>3$ GeV/c in 200 GeV pp, dAu, and AuAu (including the high
statistics run-4 data) and 62 GeV AuAu collisions. Trigger
hadrons are $h^\pm$ and identified $\pi^+, \pi^-, p$, and
$\bar{p}$ by the dE/dx relativistic rise. Correlation shapes and
$p_T$ spectra (and $ |
Saturday, April 1, 2006 8:48AM - 9:00AM |
S4.00005: Heavy Meson Reconstruction Using the STAR-SVT S. Lapointe |
Saturday, April 1, 2006 9:00AM - 9:12AM |
S4.00006: String Theoretic Toy Models of the Big Bang Jeremy Michelson Recently, examples of toy cosmologies have been found that are exact solutions of String Theory. These solutions have the feature that the theoretical framework permits reliable calculation arbitrarily close to the big bang singularity. Thus one can understand both the big bang, and late time physics. I will describe these toy cosmologies, and how they fit into String Theory's chains of equivalences between gravitational and nongravitational theories. These equivalences are the means by which one theoretically probes the big bang. [Preview Abstract] |
Saturday, April 1, 2006 9:12AM - 9:24AM |
S4.00007: Superunification at local high energy thresholds Joseph Towe It is postulated that supergravitational interactions interface with SM physics at local high energy thresholds, which are characterized by a partially broken version of E$_{8}$XE$_{8}$. The proposed threshold symmetry assigns specific quantum numbers to fields of spin 2 and spin 3/2 that are indicated by locally supersymmetric Lagrangians, and in this context, SUGRA interactions at the postulated high energy thresholds produce quark-lepton transitions or additional quark triplets (excited baryon states). Baryon structure is preserved, and only one exotic particle is required: a left handed (non-strange) version of the strange quark. [Preview Abstract] |
Saturday, April 1, 2006 9:24AM - 9:36AM |
S4.00008: Small-x valence quark production in proton-nucleus collisions Javier Lopez Albacete, Yuri Kovchegov The presence of a net non-zero baryon number at central rapidity in hadronic collisions is known as baryon stopping. This phenomenon is driven by the production of small Bjorken-x valence quarks. I will present the result for the cross section for valence quark production in proton-nucleus collisions. Multiple scattering-saturation effects are taken into account under the quasi-classical approximation. [Preview Abstract] |
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