First observation of the decay K-L -> pi(0)e(+)e(-)gamma - art. no. 021801

Citation
A. Alavi-harati et al., First observation of the decay K-L -> pi(0)e(+)e(-)gamma - art. no. 021801, PHYS REV L, 8702(2), 2001, pp. 1801-NIL_13
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
8702
Issue
2
Year of publication
2001
Pages
1801 - NIL_13
Database
ISI
SICI code
0031-9007(20010709)8702:2<1801:FOOTDK>2.0.ZU;2-9
Abstract
We report on the first observation of the decay K-L --> pi (0)e(+)e(-)gamma by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6 +/- 1.1 events, we measure the K-L --> pi (0)e(+)e(-)gamma branching ratio to be (2.34 +/- 0.35 +/- 0.13) x 10(-8) . Our data agree with recent O(p(6)) calculations in chiral perturbation th eory that include contributions from vector meson exchange through the para meter a(V). A fit was made to the K-L --> pi (0)e(+)e(-)gamma data for a(V) with the result -0.67 +/- 0.21 +/- 0.12, which is consistent with previous results from KTeV.