The b quark mass from lattice nonrelativistic QCD
The b quark mass from lattice nonrelativistic QCD
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来自晶格非相对论 QCD 的 b 夸克质量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Monahan
中科院分区：
文献类型：
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作者：
A. Hart;G. Hippel;R. Horgan;A. Lee;C. Monahan
本文首次提出了晶格非相对论QCD （NRQCD）中重夸克e能量位移的双环计算。这个计算使我们能够从晶格间距为a = 0.12fm的晶格NRQCD模拟中获得b夸克质量mb(mb, n f = 5) = 4.25(12) GeV的初步预测。我们的结果是对先前通过未淬晶格NRQCD模拟确定b夸克质量的改进，该模拟受限于使用能量位移的单回路表达式。我们的值与QCD和规则的mb(mb) = 4.163(16) GeV和使用高度改进的交错夸克的实际晶格模拟的mb(mb, n f = 5) = 4.170(25) GeV的结果很好地一致。我们采用混合策略来简化计算。Ghost，胶子和对项对能量转移和质量重整化的贡献是从猝灭的高β模拟中提取的，而费米子的贡献是在理论上使用自动晶格摄动计算的。我们的结果证明了这种策略的有效性。
We present the first two-loop calculation of the heavy quark e nergy shift in lattice nonrelativistic QCD (NRQCD). This calculation allow us to extract a preliminary prediction of mb(mb, n f = 5) = 4.25(12) GeV for the mass of the b quark from lattice NRQCD simulations performed with a lattice of spacing a = 0.12fm. Our result is an improvement on a previous determination of the b quark mass from unquenched lattice NRQCD simulations, which was limited by the use of one-loop expressions for the energy shift. Our value is in good agreement with recent results of mb(mb) = 4.163(16) GeV from QCD sum rules and mb(mb, n f = 5) = 4.170(25) GeV from realistic lattice simulations using highly-improved stag gered quarks. We employ a mixed strategy to simplify our calculation. Ghost, gluon and counterterm contributions to the energy shift and mass renormalisation are extracted from quenched high-beta simulations whilst fermionic contributions are calculated using automated lattice perturbati on theory. Our results demonstrate the effectiveness of such a strategy.
影响因子：
5
作者：
Chetyrkin, K. G.;Kuehn, J. H.;Sturm, C.
通讯作者：
Sturm, C.