Griffiths Introduction to Elementary Particles · Problem 9.13

Quantum Chromodynamics — David J. Griffiths

Physics — QFT · quarkonium-decay-branching-ratio

Problem

Derive a formula for the branching ratio Γ(ηc→2g)/Γ(ηc→2γ)\Gamma(\eta_c \to 2g)/\Gamma(\eta_c \to 2\gamma), using equation (9.66) and the analogous expression for the electromagnetic decay ηc→2γ\eta_c \to 2\gamma.

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