Study of the phi decays into pi(0)pi(0)gamma and eta pi(0)gamma final states

Citation
Rr. Akhmetshin et al., Study of the phi decays into pi(0)pi(0)gamma and eta pi(0)gamma final states, PHYS LETT B, 462(3-4), 1999, pp. 380-388
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
462
Issue
3-4
Year of publication
1999
Pages
380 - 388
Database
ISI
SICI code
0370-2693(19990916)462:3-4<380:SOTPDI>2.0.ZU;2-K
Abstract
Radiative decays of the phi meson have been studied using a data sample of about 19 million phi decays collected by the CMD-2 detector at VEPP-2M coll ider in Novosibirsk. From selected e(+)e(-)-->pi(0)pi(0)gamma and e(+)e(-)- ->eta pi(0)gamma events the following model independent results have been o btained: Bu(phi -->pi(0)pi(0)gamma) = (0.92 +/- 0.08 +/- 0.06) x 10(-4) for M(pi)0(pi)0 > 700 MeV, Br(phi -->eta pi(0)gamma) = (0.90 +/- 0.24 +/- 0.10 ) x 10(-4). It is shown that the intermediate mechanism f(0)(980)gamma domi nates in the phi -->pi(0)pi(0)gamma decay and the corresponding branching r atio is Br(phi --> f(0)(980)gamma) = (2.90 +/- 0.21 +/- 1.54) x 10(-4). The systematic error is dominated by the possible model uncertainty. Using the same data sample the upper limit has been obtained for the P- and CP-viola ting decay of eta at 90% CL: Br(eta -->pi(0)pi(0)) < 4.3 x 10(-4). (C) 1999 Published by Elsevier Science B.V. All rights reserved.