Resummation of relativistic corrections to eta(c)->gamma gamma
- Authors
- Chung, Hee Sok; Lee, Jungil; Yu, Chaehyun
- Issue Date
- 1월-2008
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- nonrelativistic QCD; relativistic corrections; threshold expansion
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.52, no.1, pp.21 - 26
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 52
- Number
- 1
- Start Page
- 21
- End Page
- 26
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/124550
- DOI
- 10.3938/jkps.52.21
- ISSN
- 0374-4884
- Abstract
- By using the threshold-expansion approach, we compute the relativistic corrections to the two-photon decay width of a spin-singlet S-wave heavy quarkonium. The corrections are resummed to all orders in the heavy-quark velocity upsilon in the quarkonium-rest frame, where we keep all the contributions of the color-singlet Q (Q) over bar potential. Our result agrees with a previous derivation based on the exact spin-projector approach. We also discuss the phenomenological implications of the resummed formula.
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