B-> K photon photon via intermediate eta'

TL;DR

This paper investigates the dominant role of the eta' resonance in long-distance contributions to B meson decays into two photons and a strange hadron, calculating the branching ratio for B->K eta'->K gamma gamma.

Contribution

It introduces a calculation of the B->K eta'->K gamma gamma decay branching ratio using the nonspectator mechanism, highlighting eta' as a key intermediate resonance.

Findings

Branching ratio B^eta'(B->K gamma gamma) ~ 8.7 x 10^{-7}

Eta' contribution exceeds eta_c contribution in this decay mode

Supports the conjecture of eta' dominance in long-distance effects

Abstract

We examine our previous conjecture that the eta' intermediate resonance has the dominant role in the long distance contributions to B decay into two photons and a strange final state hadron. We calculate the branching ratio of the exclusive B-> K eta'-> K photon photon decay using the nonspectator mechanism for eta' production in charmless hadronic B decays. It is shown that the obtained branching ratio B^eta'(B-> K\gamma\gamma)~ 8.7 X 10^{-7} is more than twice as large as the eta_c contribution to this decay mode.