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

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

2001-12-12

arxiv.org/abs/hep-ph/0112170v1

Phys.Lett.B526:355-359,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/S0370-2693(01)01520-9

We analyze the decays $\phi \to K\bar{K}$ 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 $\phi \to K\bar{K}$, which is just above threshold. We show that the theoretical corrections resolve a puzzling $5\sigma$ discrepancy between theory and experiment for the branching ratio $R = \Gamma (\phi \to K^+K^-)/\Gamma(\phi \to K^0\bar{K}^0)$.

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