UNITARITY AND VECTOR-MESON CONTRIBUTIONS TO K-]PI(+)GAMMA-GAMMA (VOL 386, PG 403, 1996)()

Authors
DAMBROSIO G PORTOLES J
Citation
G. Dambrosio et J. Portoles, UNITARITY AND VECTOR-MESON CONTRIBUTIONS TO K-]PI(+)GAMMA-GAMMA (VOL 386, PG 403, 1996)(), Physics letters. Section B, 389(4), 1996, pp. 770-780
Citations number
42
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
389
Issue
4
Year of publication
1996
Pages
770 - 780
Database
ISI
SICI code
0370-2693(1996)389:4<770:UAVCTK>2.0.ZU;2-9
Abstract
We compute the one-loop unitarity corrections O(p(6)) from K+ --> pi()pi(+)pi(-) to K+ --> pi(+)gamma gamma and we find that they are relev ant, increasing the leading order prediction for the width in a 30-40% . The contributions of local O(p(6)) amplitudes, generated by vector m eson exchange, are discussed in several models and we conclude that th e vector resonance contribution should be negligible compared to the u nitarity corrections.