Unitarity and vector meson contributions to K^+ -> pi^+ gamma gamma

Details Unitarity and vector meson contributions to K^+ -> pi^+ gamma gamma Unitarity and vector meson contributions to K^+ -> pi^+ gamma gamma

1996-06-03

arxiv.org/abs/hep-ph/9606213v1

Phys.Lett. B386 (1996) 403-412; Phys.Lett. B389 (1996) 770-780

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, LaTex, 4 figures included as PS files, uuencoded with uufiles, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(96)01476-1

We compute the one-loop unitarity corrections O(p^6) from K^+ -> pi^+ pi^+ pi^- to K^+ -> pi^+ gamma gamma and we find they are relevant, increasing the leading order prediction for the width in a 30-40%. The contributions of local O(p^6) amplitudes, generated by vector meson exchange, are discussed in several models and we conclude that the vector resonance contribution should be negligible compared to the unitarity corrections.

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