Resummation of Relativistic Corrections to ηc → γγ

다국어 초록 (Multilingual 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 $Q\bar{Q}$ 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.

다국어 초록 (Multilingual 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 $Q\bar{Q}$ 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.

참고문헌 (Reference)

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17 Chaehyun Yu, "Resumming Relativistic Corrections to Γ[J/ψ→e+e-]" 한국물리학회 50 (50): 357-360, 2007

18 Jungil Lee, "One-Loop Scalar Integrals Contributing to Resummation of Relativistic Corrections to Γ[J/ψ→e+e-]" 한국물리학회 50 (50): 403-408, 2007

19 Jungil Lee, "One-Loop Master Integral for Order-v2n Relativistic Corrections Γ[J/ψ→e+e-]" 한국물리학회 50 (50): 398-402, 2007