Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-07-16
Phys.Rev.D79:014007,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, minor corrections, version published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.79.014007
We compute in order alpha_s 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/psi operator matrix elements.
Bodwin Geoffrey T.
Chung Hee Sok
Lee Jungil
Yu Chaehyun
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