TTP21-054 Correlators of heavy--light quark currents in HQET: OPE at three loops
TTP21-054 Correlators of heavy–light quark currents in HQET: OPE at three loops
K.G. Chetyrkin, A.G. Grozin
Nucl.Phys.B 976 (2022) 115702
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arXiv