Bulletin of the American Physical Society
2013 Fall Meeting of the APS Division of Nuclear Physics
Volume 58, Number 13
Wednesday–Saturday, October 23–26, 2013; Newport News, Virginia
Session HG: Heavy Ion Collisions: Heavy Flavor and Exotics |
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Chair: Megan Connors, Yale University Room: Pearl Ballroom II |
Friday, October 25, 2013 8:30AM - 8:42AM |
HG.00001: The production of dielectrons in Au$+$Au collisions at $\surd $s$_{\mathrm{NN}}=$ 27 GeV from STAR Joseph Butterworth Heavy-ion collisions at relativistic energies are capable of producing hot, dense, and strongly interacting nuclear matter. From the time of collision, leptons are produced and travel through the system with minimal interaction. Thus, dileptons make an excellent probe of the matter. At SPS beam energies, a significant enhancement was observed in the low-mass range (M$_{\mathrm{ee}}$ \textless 1.1 GeVc$^{\mathrm{-2}})$. This enhancement was found to be consistent with an in-medium modification of the $\rho $ meson spectral function. At top RHIC energies, such enhancements have been observed again. The beam energy scan program aims to close the gap between SPS and top RHIC energies by systematically studying the intermediate center of mass energies. The STAR experiment is in an excellent position to study these medium modifications because of its high purity, large acceptance electron identification through the combined use of its Time Projection Chamber and Time of Flight detectors. In this presentation, I will present a study of the dielectron production in Au$+$Au collisions at $\surd $s$_{\mathrm{NN}}=$ 27 GeV and compare to results at the other RHIC energies. [Preview Abstract] |
Friday, October 25, 2013 8:42AM - 8:54AM |
HG.00002: Heavy Flavor Muons at Forward Rapidity in $\sqrt{s_{NN}}$ = 200 GeV collisions at PHENIX Matthew Wysocki Understanding the dynamics of heavy flavor production and suppression in A+A collisions is important to unraveling the properties of the quark-gluon plasma produced at RHIC. The related observables offer direct insight into the strongly-coupled nature of the medium. It has also become increasingly apparent that the production and suppression in the absence of a hot medium need to be studied in detail, via comprehensive measurements in p+p, p(d)+A, and A+A collisions of varying size and energy at RHIC and the LHC. In this talk I will discuss recently-released heavy flavor invariant yields and nuclear modification factors at forward and backward rapidity in d+Au collisions at PHENIX, as well as the current progress in analyzing the same in the 2012 $\sqrt{s_{NN}}$ = 200 GeV Cu+Au and p+p data. [Preview Abstract] |
Friday, October 25, 2013 8:54AM - 9:06AM |
HG.00003: ABSTRACT WITHDRAWN |
Friday, October 25, 2013 9:06AM - 9:18AM |
HG.00004: Study of non-prompt J/$\psi $ production from B decays in Cu$+$Au collisions with the PHENIX Detector at RHIC Margaret Jezghani, Xiaochun He A major objective in the field of heavy ion collisions is to quantify and characterize the properties of QGP by studying heavy flavor production. The J/$\psi $ meson can be produced in one of three ways: 1) directly in the collision, 2) indirectly via feeddown from heavier charmonium states, or 3) from the decay of B-hadrons. If the J/$\psi $ is produced through either of the first two methods, it is called a prompt J/$\psi $, while the third method produces a non-prompt J/$\psi $. With the newly commissioned forward silicon vertex detector (FVTX) in 2012, it is possible for the first time at the PHENIX experiment to extract non-prompt J/$\psi $'s from the inclusive J/$\psi $ signal. In this talk, we will present the current status of the data analysis for J/$\psi $'s that come from B decays in Cu$+$Au collisions with the PHENIX experiment at RHIC. [Preview Abstract] |
Friday, October 25, 2013 9:18AM - 9:30AM |
HG.00005: Decay of charmed hadrons -- SHARE with CHARM Michal Petran, Johann Rafelski In Pb--Pb collisions at LHC, a rather large number of charm--anti-charm quark pairs, $N_{c\overline{c}}\equiv dN_{c\overline{c}}/dy$, is produced in initial hard parton collisions before the QGP phase emerges. Given $N_{c\overline{c}}$, we predict yields of all charmed hadrons using statistical hadronization method for $\sqrt{s_{NN}}=2.76\,\mathrm{TeV}$ and foreseen $\sqrt{s_{NN}}=5.5\,\mathrm{TeV}$, where, respectively, $N_{c\overline{c}}=56$ and $N_{c\overline{c}}=90$ has been predicted for 0--5\% centrality. Based on experimental decay data, symmetry principles and plausibility arguments, we prepare a complete charmed hadron decay table. The CHARM module adds charm decay hadron multiplicity into SHARE, the statistical hadronization model implementation we use. SHARE with CHARM utility uses $N_{c\overline{c}}$ as an additional fit parameter when analyzing hadron production in heavy--ion collisions. We quantify the charm hadron decay contributions in the final hadron yields. We find that about 20\% of charm is bound to strangeness and, as a consequence, charm decays contribute a significant fraction of multistrange hadron yields. Up to 20\% of $\phi$, 15\% of $\Xi$ and 15\% of $\Omega$ yield is produced directly by charm decays, whereas non--strange particles are affected less. [Preview Abstract] |
Friday, October 25, 2013 9:30AM - 9:42AM |
HG.00006: ABSTRACT WITHDRAWN |
Friday, October 25, 2013 9:42AM - 9:54AM |
HG.00007: Heavy Quark Dynamics in a Linearized Boltzmann Approach J. Scott Moreland, Steffen Bass The quark-gluon plasma (QGP) produced in ultra-relativistic heavy-ion collisions at RHIC and LHC has exhibited a number of interesting properties. In our work we focus on the dynamics of heavy quarks produced in the early stages of the collision which show a surprising amount of elliptic flow and a strong suppression in the high-$p_\perp$ domain. Our study is conducted with a newly developed linearlized Boltzmann approach for the propagation of heavy quarks in a realistic QGP medium described by relativistic viscous fluid dynamics. Our approach uses pQCD matrix elements for the interaction between the heavy quarks and the QGP fluid and is thus designed to test whether heavy quark dynamics can be understood in terms of heavy quarks interacting perturbatively with a non-perturbative soft medium. [Preview Abstract] |
Friday, October 25, 2013 9:54AM - 10:06AM |
HG.00008: Hydrogen-like atoms Agnes Mocsy |
Friday, October 25, 2013 10:06AM - 10:18AM |
HG.00009: Searching for Muonic Atoms at STAR Kefeng Xin Hydrogen-like muonic atoms are Coulomb bound states of a muon and a hadron. In ultrarelativistic heavy-ion collisions, due to the high particle multiplicities, a produced muon can be directly bound to a charged hadron and form an atom. With muon identification at low transverse momentum from the Time-of-Flight (TOF) detector, STAR provides an great opportunity to search for the muonic atoms with exotic cores, such as anti-matter or strange cores. This is also an ideal tool to measure the thermal emission from the Quark-Gluon Plasma (QGP) via a direct measurement of the single muon spectrum. Because only thermal muons or muons from resonance decays are capable to form atoms, the background muons from weak decay are cleanly excluded. We will present the status of this analysis on the $\sqrt{s_{NN}}=200$ GeV Au+Au collisions collected by STAR during RHIC runs in 2010 and 2011. Various methods and techniques, including invariant mass analysis, particle correlations and $\alpha$ distributions will be shown. [Preview Abstract] |
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