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arXiv 1504.05979hep-phhep-lat
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格点上和连续统中的Bottomonium超精细分裂

Bottomonium Hyperfine Splitting on the Lattice and in the Continuum

M. Baker, A. A. Penin, D. Seidel, N. Zerf

摘要:

我们修正了格点非相对论QCD中底鎓超精细分裂的分析。基于关于连续极限的渐近展开式,用半解析方法计算了辐射改进的晶格作用量的Wilson系数。用非相对论性重整化群估计高阶辐射修正。我们对$1S$超精细分裂的结果是$M_{Υ(1S)}-M_{η_b(1S)}=52.9\pm 5.5~{\rm MeV}$。它调和的连续和格点量子色动力学的预测,是在非常好的协议与最精确的实验测量由Belle合作。

英文摘要:

We revise the analysis of the bottomonium hyperfine splitting within the lattice nonrelativistic QCD. The Wilson coefficients of the radiatively improved lattice action are evaluated by a semianalytic approach based on the asymptotic expansion about the continuum limit. The nonrelativistic renormalization group is used to estimate the high-order radiative corrections. Our result for the $1S$ hyperfine splitting is $M_{Υ(1S)}-M_{η_b(1S)}=52.9\pm 5.5~{\rm MeV}$. It reconciles the predictions of the continuum and lattice QCD and is in very good agreement with the most accurate experimental measurement by Belle collaboration.

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