Order-alpha(s) corrections to the quarkonium electromagnetic current at all orders in the heavy-quark velocity
- Authors
- Bodwin, Geoffrey T.; Chung, Hee Sok; Lee, Jungil; Yu, Chaehyun
- Issue Date
- 1월-2009
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW D, v.79, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW D
- Volume
- 79
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/120856
- DOI
- 10.1103/PhysRevD.79.014007
- ISSN
- 1550-7998
- Abstract
- 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.
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Collections - College of Science > Department of Physics > 1. Journal Articles
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