Radiative improvement of the lattice nonrelativistic QCD action using the background field method and application to the hyperfine splitting of quarkonium states.
Radiative improvement of the lattice nonrelativistic QCD action using the background field method and application to the hyperfine splitting of quarkonium states.
复制标题
使用背景场方法对晶格非相对论 QCD 作用的辐射改进及其在夸克态超精细分裂中的应用。
DOI：
10.1103/physrevlett.107.112002
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发表时间：
2011
影响因子：
8.6
通讯作者：
C. Monahan
中科院分区：
文献类型：
--
作者：
T. Hammant;A. Hart;G. von Hippel;R. Horgan;C. Monahan
我们首次将背景场方法应用于晶格上的非相对论QCD(NRQCD)，以便以明显规范协变的方式确定NRQCD作用系数的单圈辐射修正。在单圈水平上计算了σ·B项在NRQCD作用和四费米子自旋-自旋相互作用中的系数，发现底原子的超精细分裂的位移使晶格预测与实验相符。
We present the first application of the background field method to nonrelativistic QCD (NRQCD) on the lattice in order to determine the one-loop radiative corrections to the coefficients of the NRQCD action in a manifestly gauge-covariant manner. The coefficients of the σ·B term in the NRQCD action and the four-fermion spin-spin interaction are computed at the one-loop level; the resulting shift of the hyperfine splitting of bottomonium is found to bring the lattice predictions in line with experiment.