Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session DE: Mini-Symposium on Precision Lattice Gauge Theory I |
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Chair: Shigemi Ohta, KEK Room: Kohala 2 |
Thursday, October 15, 2009 7:00PM - 7:30PM |
DE.00001: Lattices and non-perturbative field theory Invited Speaker: To introduce this session I discuss some of the historical circumstances that drove us to use the lattice as a non-perturbative regulator. This approach has had immense success, convincingly demonstrating quark confinement and obtaining crucial properties of the strong interactions from first principles. [Preview Abstract] |
Thursday, October 15, 2009 7:30PM - 7:45PM |
DE.00002: Physical results from (2+1) flavor Domain Wall Fermion simulations Chulwoo Jung We present results from (2+1) flavor dynamical lattice QCD simulations, using Domain Wall Fermion and Iwasaki gauge action, in 2 different lattice spacings. We focus on continuum extrapolations of pseudoscalar meson masses and decay constants and Kaon bag parameter ($B_K$). [Preview Abstract] |
Thursday, October 15, 2009 7:45PM - 8:00PM |
DE.00003: Nucleon properties from chirally symmetric lattice QCD Yasumichi Aoki We report on the calculations for properties of nucleon using domain-wall fermions on the lattice. The calculation takes into account the effect of $u$, $d$ and $s$ sea quarks. The use of domain-wall fermion makes it possible to have chiral symmetry of the lattice action under control. Hence the influence of the spontaneous chiral symmetry breaking onto low energy quantity is correctly incorporated even at a finite lattice spacing. The form factors of the isovector vector and axial vector current, as well as some lowest moment structure functions are calculated. Finite volume effect on these quantities are examined. Direct calculation of the matrix elements of baryon number violating nucleon decay is performed, which provides a reliable estimate of the proton lifetime. [Preview Abstract] |
Thursday, October 15, 2009 8:00PM - 8:15PM |
DE.00004: Lattice calculations of the nucleon form factors in full QCD Meifeng Lin We present recent results for the nucleon form factors from lattice simulations by the LHP Collaboration using the chirally symmetric domain wall fermions at pion masses as light as 300 MeV. The improved numerical techniques and the access to the increasing national computing resources have allowed us to achieve unprecedented precisions in these full QCD calculations. We investigate phenomenological fits to the momentum transfer dependence of the form factors, and study chiral extrapolations using baryon chiral effective field theories. Results are compared with the experiment and challenges in these calculations are also discussed. [Preview Abstract] |
Thursday, October 15, 2009 8:15PM - 8:30PM |
DE.00005: Progress in Excited Hadron States in Lattice QCD Colin Morningstar Progress in extracting the spectrum of excited hadron resonances in lattice QCD Monte Carlo calculations is reviewed and the key issues and challenges in such computations are outlined. The importance of multi-hadron states as simulations with lighter pion masses are done is discussed, and the need for all-to-all quark propagators is emphasized. [Preview Abstract] |
Thursday, October 15, 2009 8:30PM - 8:45PM |
DE.00006: Excited-Nucleon Spectroscopy with 2+1 Fermion Flavors Huey-Wen Lin We present progress made by the Hadron Spectrum Collaboration (HSC) in determining the tower of excited nucleon states using 2+1-flavor anisotropic clover lattices[1]. HSC has been investigating interpolating operators projected into irreducible representations of the cubic group[2] in order to better calculate two-point correlators for nucleon spectroscopy; results are published for quenched[3] and 2-flavor anisotropic Wilson lattices[4]. In this work, we present the latest results using a new technique, distillation[5], which allows us to reach higher statistics than before. Future directions will be outlined at the end of the presentation. \\[4pt] [1] R. Edwards et al., Phys. Rev. D 78, 054501 (2008); H.-W. Lin et al., Phys. Rev. D 79, 034502 (2009).\\[0pt] [2] S. Basak et al., Phys. Rev. D72, 094506 (2005); Phys. Rev. D 72, 074501 (2005)\\[0pt] [3] S. Basak et al., Phys. Rev. D76, 074504 (2007).\\[0pt] [4] J. Bulava et al., Phys. Rev. D 79, 034505(2009).\\[0pt] [5] M. Peardon et al., 0905.3352[hep-lat]. [Preview Abstract] |
Thursday, October 15, 2009 8:45PM - 9:00PM |
DE.00007: Nuclear Forces from Lattice QCD Tetsuo Hatsuda Recent results of the HAL QCD collaboration on the nucleon-nucleon interactions in quenched and full QCD lattice simulations will be reported. Special emphases are placed on the non-locality of the NN potential, derivation of the tensor and spin-orbit forces and the quark mass dependence of the two-nucleon observables. [Preview Abstract] |
Thursday, October 15, 2009 9:00PM - 9:15PM |
DE.00008: Noise in Baryon Correlation Functions Martin Savage One of the main objectives of lattice QCD is to calculate the properties and interactions of multi-nucleon systems. I will present recent results by the NPLQCD collaboration on one-, two- and three-baryon systems, with particular focus on the behavior of the noise in the correlation functions. Understanding and taming the noise in these correlation functions is important for future progress. [Preview Abstract] |
Thursday, October 15, 2009 9:15PM - 9:30PM |
DE.00009: Extracting Nuclear Forces from Lattice QCD Thomas Luu I discuss the theoretical aspects of extracting nuclear force parameters from LQCD calculations. I give the current status of these calculations and describe the issues that must be addressed as we move towards the exascale era. [Preview Abstract] |
Thursday, October 15, 2009 9:30PM - 9:45PM |
DE.00010: Charmonium-Nucleon Interaction from Quenched Lattice QCD with Relativistic Heavy Quark Action Taichi Kawanai, Shoichi Sasaki, Tetsuo Hatsuda Low energy charmonium-nucleon interaction is of particular interest in this talk. A heavy quarkonium state like the charmonium does not share the same quark flavor with the nucleon so that $c\bar{c}$-nucleon interaction might be described by the gluonic van der Waals interaction, which is weak but attractive. Therefore, the information of the strength of $c\bar{c}$-nucleon interaction is vital for considering the possibility of the formation of charmonium bound to nuclei. We will present the preliminary results for the scattering length and the interaction range of charmonium-nucleon s-wave scattering from quenched lattice QCD. These low-energy quantities can provide useful constraints on the phenomenological $c\bar{c}$-nucleon potential, which is required for precise prediction of the binding energy of nuclear-bound charmonium in exact few body calculations. Our simulations are performed at a lattice cutoff of 1/a=2.0 GeV with the nonperturbatively O(a) improved Wilson action for the light quark and a relativistic heavy quark action for the charm quark. A new attempt of calculating the $c\bar{c}$-nucleon potential through the Bethe-Salpeter wave function will be also discussed. [Preview Abstract] |
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