Measurement of the decay K-L -> pi(0)gamma gamma

Citation
A. Alavi-harati et al., Measurement of the decay K-L -> pi(0)gamma gamma, PHYS REV L, 83(5), 1999, pp. 917-921
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
83
Issue
5
Year of publication
1999
Pages
917 - 921
Database
ISI
SICI code
0031-9007(19990802)83:5<917:MOTDK->2.0.ZU;2-Y
Abstract
We report on a new measurement of the decay K-L --> pi(0)gamma gamma by the KTeV experiment at Fermilab. We determine the K-L --> pi(0)gamma gamma bra nching ratio to be (1.68 +/- 0.07 +/- 0.08) x 10(-6). Our data show the fir st evidence for a low-mass gamma gamma signal as predicted by recent O(p(6) ) chiral perturbation calculations which include vector meson exchange cont ributions. From our data, we extract a value for the effective vector coupl ing a(V) = -0.72 +/- 0.05 +/- 0.06.