Three-loop nonsinglet matching coefficients for heavy quark currents
PHYSICAL REVIEW D(2022)
摘要
We compute the matching coefficients between QCD and nonrelativistic QCD for external vector, axial vector, scalar, and pseudoscalar currents up to three-loop order. We concentrate on the nonsinglet contributions and present precise numerical results with an accuracy of about ten digits. For the vector current the results from Marquard et al. [Phys. Rev. D 89, 034027 (2014)] are confirmed, increasing the accuracy by several orders of magnitude.
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关键词
currents,three-loop
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