Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session P9: Minisymposium: Advances in Zero- and Finite-Temperature Lattice QCD |
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Sponsoring Units: DNP Chair: Ron Soltz, Lawrence Livermore National Laboratory Room: Hyatt Regency Dallas Cumberland B |
Monday, April 24, 2006 10:45AM - 11:21AM |
P9.00001: Lattice simulations of strongly interacting matter under extreme conditions Invited Speaker: I am going to review current status of lattice QCD at finite temperature and its implication on Quark Gluon Plasma seacrh at RHIC, including the transition temperature, equation of state, mesonspectral functions. A special attention will be devoted to heavy quark potentials, quarkonia spectral functions, and heavy quark transport. [Preview Abstract] |
Monday, April 24, 2006 11:21AM - 11:57AM |
P9.00002: Lattice QCD and Nuclear Physics Invited Speaker: I will discuss the progress that is being made toward computing the interactions between nucleons using lattice QCD. [Preview Abstract] |
Monday, April 24, 2006 11:57AM - 12:09PM |
P9.00003: Phase Diagram of Two-Color lattice QCD in the chiral limit Shailesh Chandrasekharan, Fu-Jiun Jiang We study thermodynamics of strongly coupled lattice QCD with two colors of massless staggered fermions as a function of the baryon chemical potential $\mu$ in $3+1$ dimensions using a new cluster algorithm. We find evidence that the model undergoes a weak first order phase transition at $\mu=0$ which becomes second order at a finite $\mu$. Symmetry considerations suggest that the universality class of these phase transition should be governed by a $O(N)\times O(2)$ field theory with collinear order, with $N=3$ at $\mu=0$ and $N=2$ at $\mu \neq 0$. The universality class of the second order phase transition at $\mu\neq 0$ appears to be governed by the decoupled $XY$ fixed point present in the $O(2)\times O(2)$ field theory. Finally we show that the quantum ($T=0$) phase transition as a function of $\mu$ is also second order and can be understood as a mean field transition. [Preview Abstract] |
Monday, April 24, 2006 12:09PM - 12:21PM |
P9.00004: Extrapolation Formulas for Neutron EDM Calculations in Lattice QCD Donal O'Connell, Martin Savage Lattice QCD is rapidly progressing toward being able to reliably compute the electric dipole moment of the neutron as a function of the strong CP-violating parameter $\overline{\theta}$. Present day calculations are performed at unphysical values of the light quark m asses, in volumes that are not exceptionally large and at lattice spacings that are not exceptionally small . We use chiral perturbation theory to determine the leading contributions to the neutron electric dipole moment at finite volume, and in partially-quenched calculations. [Preview Abstract] |
Monday, April 24, 2006 12:21PM - 12:33PM |
P9.00005: Lattice QCD calculations of B meson properties and consequences for quark flavor phenomenology Matthew Wingate, Christine Davies, Alan Gray, Emel Gulez, Peter Lepage, Junko Shigemitsu Lattice QCD calculations now include the effects of 2 light sea quarks and 1 strange sea quark through the use of an improved staggered fermion action. Consequently, results important to phenomenology are free of the approximate 10\% errors inherent in the quenched approximation. This talk reports on calculations of the $B$ and $B_s$ decay constants, matrix elements relevant for neutral $B$ meson mixing, and $B \to \pi \ell \nu$ form factors. The focus of the talk will be on the current lattice uncertainties, the prospects for reducing them, and the role the results will play in flavor physics phenomenology. [Preview Abstract] |
Monday, April 24, 2006 12:33PM - 12:45PM |
P9.00006: QCD thermodynamics with $N_f=3$, $2+1$ near the continuum limit at realistic quark masses Takashi Umeda, Michael Cheng, Norman Christ, Chulwoo Jung, Frithjof Karsch, Robert Mawhinney, Peter Petreczky, Konstantin Petrov, Christian Schmidt We report our study of the thermodynamics with 3 and 2+1 flavors of QCD. In order to investigate the properties near the continuum limit we adopt improved staggered (p4) quark actions coupled with a tree-level Symanzik improved glue on $N_t=4$ and 6 lattices. The simulations are performed with small light quark masses at which the pion mass is about 200 MeV or larger. In this talk we present several thermodynamical quantities such as critical temperature, phase diagram, and equation of states. To estimate the systematic uncertainties of these results, we also compare the results with several types of improved staggered quark action. [Preview Abstract] |
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