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arXiv 1003.1937hep-lat
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2+1味格点量子色动力学中费米实验室重夸克的调谐及其在超精细分裂中的应用

Tuning Fermilab Heavy Quarks in 2+1 Flavor Lattice QCD with Application to Hyperfine Splittings

C. Bernard, C. DeTar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, J. Lai… 展开作者

C. Bernard, C. DeTar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. Mackenzie, J. N. Simone, R. Sugar, D. Toussaint, R. S. Van de Water

摘要:

我们报道了费米实验室作用量中决定重夸克质量的参数kappa_c、kappa_b和kappa_crit的非微扰调谐。这需要计算由费米实验室重夸克和交错轻夸克组成的Ds^(*)和Bs^(*)介子的质量。此外,我们报告了Ds和Bs介子的超精细分裂作为我们的模拟和分析方法的交叉检查。我们发现一个分裂为145 +/- 15 MeV的Ds系统和40 +/- 9 MeV的Bs系统。这与粒子数据组的平均值143.9 +/- 0.4 MeV和46.1 +/- 1.5 MeV非常一致。计算是用MILC 2+1型味规配置在三个晶格间距$a$约0.15,0.12,和0.09 fm。

英文摘要:

We report the non-perturbative tuning of parameters--- kappa_c, kappa_b, and kappa_crit ---that determine the heavy-quark mass in the Fermilab action. This requires the computation of the masses of Ds^(*) and Bs^(*) mesons comprised of a Fermilab heavy quark and a staggered light quark. Additionally, we report the hyperfine splittings for Ds and Bs mesons as a cross-check of our simulation and analysis methods. We find a splitting of 145 +/- 15 MeV for the Ds system and 40 +/- 9 MeV for the Bs system. These are in good agreement with the Particle Data Group average values of 143.9 +/- 0.4 MeV and 46.1 +/- 1.5 MeV, respectively. The calculations are carried out with the MILC 2+1 flavor gauge configurations at three lattice spacings $a$ approximately 0.15, 0.12, and 0.09 fm.

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