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Corrections to Fermi's Golden Rule in $ϕ\to K\bar{K}$ Decays

E. Fischbach·A. W. Overhauser·B. Woodahl
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Abstract

We analyze the decays $ϕ\to K\bar{K}$ utilizing a formulation of transition rates which explicitly exhibits corrections to Fermi's Golden Rule. These corrections arise in systems in which the phase space and/or matrix element varies rapidly with energy, as happens in $ϕ\to K\bar{K}$, which is just above threshold. We show that the theoretical corrections resolve a puzzling $5σ$ discrepancy between theory and experiment for the branching ratio $R = Γ(ϕ\to K^+K^-)/Γ(ϕ\to K^0\bar{K}^0)$.

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E. Fischbach, A. W. Overhauser, B. Woodahl. 2001-12-12. Corrections to Fermi's Golden Rule in $ϕ\to K\bar{K}$ Decays. https://doi.org/10.1016/s0370-2693(01)01520-9

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