TY - JOUR
T1 - Order-αs corrections to the quarkonium electromagnetic current at all orders in the heavy-quark velocity
AU - Bodwin, Geoffrey T.
AU - Chung, Hee Sok
AU - Lee, Jungil
AU - Yu, Chaehyun
N1 - Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/1/5
Y1 - 2009/1/5
N2 - We compute in order αs the nonrelativistic QCD (NRQCD) short-distance coefficients that match quark-antiquark operators of all orders in the heavy-quark velocity v to the electromagnetic current. We employ a new method to compute the one-loop NRQCD contribution to the matching condition. The new method uses full-QCD expressions as a starting point to obtain the NRQCD contribution, thus greatly streamlining the calculation. Our results show that, under a mild constraint on the NRQCD operator matrix elements, the NRQCD velocity expansion for the quark-antiquark-operator contributions to the electromagnetic current converges. The velocity expansion converges rapidly for approximate J/ψ operator matrix elements.
AB - We compute in order αs the nonrelativistic QCD (NRQCD) short-distance coefficients that match quark-antiquark operators of all orders in the heavy-quark velocity v to the electromagnetic current. We employ a new method to compute the one-loop NRQCD contribution to the matching condition. The new method uses full-QCD expressions as a starting point to obtain the NRQCD contribution, thus greatly streamlining the calculation. Our results show that, under a mild constraint on the NRQCD operator matrix elements, the NRQCD velocity expansion for the quark-antiquark-operator contributions to the electromagnetic current converges. The velocity expansion converges rapidly for approximate J/ψ operator matrix elements.
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U2 - 10.1103/PhysRevD.79.014007
DO - 10.1103/PhysRevD.79.014007
M3 - Article
AN - SCOPUS:59249107368
VL - 79
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 0556-2821
IS - 1
M1 - 014007
ER -