Study of the K-L(0) -> pi(+)pi(-)gamma direct emission vertex

Citation
A. Alavi-harati et al., Study of the K-L(0) -> pi(+)pi(-)gamma direct emission vertex, PHYS REV L, 86(5), 2001, pp. 761-764
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
86
Issue
5
Year of publication
2001
Pages
761 - 764
Database
ISI
SICI code
0031-9007(20010129)86:5<761:SOTK-P>2.0.ZU;2-Y
Abstract
We have perfomed studies of the K-L(0) --> pi (+) pi (-) gamma direct emiss ion (DE) and inner Bremsstrahlung (IB) vertices, based on data collected by KTeV during the 1996 Fermilab fixed target run. We find a(1)/a(2) = -0.737 +/- 0.034 GeV2 for the DE form-factor parameter in the rho -propagator par ametrization, and report on fits of the form factor to linear and quadratic functions as well. We concurrently measure Gamma (K-L(0) --> pi (+) pi (-) gamma ,E-gamma*: > 20 MeV)/Gamma (K-L(0) --> pi (+) pi (-)) = (20.8 +/- 0. 3) x 10(-3), and a K-L(0) --> pi (+) pi (-) gamma DE/(DE + IB) branching ra tio of 0.683 +/- 0.011.