Interquark potential for the charmonium system with almost physical quark masses

Taichi Kawanai, Shoichi Sasaki

Research output: Contribution to journalConference articlepeer-review

Abstract

We study an interquark QQ potential for the charmonium system, that is determined from the the equal-time and Coulomb gauge QQ Bethe-Salpeter (BS) wavefunction through the effective Schrödinger equation. This novel approach enables us to evaluate a kinetic heavy quark mass mQ and a proper interquark potential at finite quark mass mQ, which receives all orders of 1/mQ corrections on the static QQ potential from Wilson loops, simultaneously. Precise information of the interquark potential for both charmonium and bottomonium states directly from lattice QCD provides us a chance to improve quark potential models, where the spin-independent interquark potential is phenomenologically described by the Cornell potential and the spin-dependent parts are deduced within the framework of perturbative QCD, from first-principles calculations. In this study, calculations are carried out in both quenched and dynamical fermion simulations. We first demonstrate that the interquark potential at finite quark mass calculated by the BS amplitude method smoothly approaches the conventional static heavy quark potential from Wilson loops in the infinitely heavy quark limit within quenched lattice QCD simulations. Secondly, we determine both spin-independent and -dependent parts of the interquark potential for the charmonium system in 2+1 flavor dynamical lattice QCD using the PACS-CS gauge configurations at the lightest pion mass, Mπ = 156 MeV.

Original languageEnglish
JournalProceedings of Science
Volume139
Publication statusPublished - 2011 Jan 1
Externally publishedYes
Event29th International Symposium on Lattice Field Theory, Lattice 2011 - Squaw Valley, Lake Tahoe, United States
Duration: 2011 Jul 102011 Jul 16

ASJC Scopus subject areas

  • General

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