Resummation of relativistic corrections to ηc -→ γγ

Hee Sok Chung; Jungil Lee; Chaehyun Yu

doi:10.3938/jkps.52.21

Resummation of relativistic corrections to η_c -→ γγ

Hee Sok Chung, Jungil Lee, Chaehyun Yu

Department of Physics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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 v in the quarkonium-rest frame, where we keep all the contributions of the color-singlet QQ̄ 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.

Original language	English
Pages (from-to)	21-26
Number of pages	6
Journal	Journal of the Korean Physical Society
Volume	52
Issue number	1
DOIs	https://doi.org/10.3938/jkps.52.21
Publication status	Published - 2008 Jan

Keywords

Nonrelativistic QCD
Relativistic corrections
Threshold expansion

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.3938/jkps.52.21

Cite this

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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 v in the quarkonium-rest frame, where we keep all the contributions of the color-singlet Q{\=Q} 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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AU - Chung, Hee Sok

AU - Lee, Jungil

AU - Yu, Chaehyun

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N2 - 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 v in the quarkonium-rest frame, where we keep all the contributions of the color-singlet QQ̄ 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.

AB - 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 v in the quarkonium-rest frame, where we keep all the contributions of the color-singlet QQ̄ 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.

KW - Nonrelativistic QCD

KW - Relativistic corrections

KW - Threshold expansion

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