SEARCH FOR RARE PHI-DECAYS IN PI(-)GAMMA FINAL-STATE()PI()

Authors
AKHMETSHIN RR AKSENOV GA ANASHKIN EV ARPAGAUS M ASTAKHOV VA BAIBUSINOV BO BANZAROV VS BARKOV LM BONDAR AE CHERNYAK DV EIDELMAN SI FEDOTOVICH GV GABYSHEV NI GREBENIUK AA GRIGORIEV DN IVANOV PM KHAZIN BI KOOP IA KURDADZE LM KUZMIN AS LOGASHENKO IB LUKIN PA LYSENKO AP MAKSIMOV AV MERZLYAKOV YI NESTERENKO IN OKHAPKIN VS PEREVEDENTSEV EA POPKOV EV PURLATZ TA ROOT NI RUBAN AA RYSKULOV NM SHUBIN MA SHWARTZ BA SIDOROV VA SKRINSKY AN SMAKHTIN VP SNOPKOV IG SOLODOV EP SUKHANOV AI TITOV VM YUDIN YV BROWN DH ROBERTS DH ROBERTS BL THOMPSON JA VALINE CM HUGHES VW
Citation
Rr. Akhmetshin et al., SEARCH FOR RARE PHI-DECAYS IN PI(-)GAMMA FINAL-STATE()PI(), Physics letters. Section B, 415(4), 1997, pp. 452-462
Citations number
35
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
415
Issue
4
Year of publication
1997
Pages
452 - 462
Database
ISI
SICI code
0370-2693(1997)415:4<452:SFRPIP>2.0.ZU;2-O
Abstract
A search for phi radiative decays has been performed using a data samp le of about 2.0 million phi decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From the selected e(+)e(-) --> pi(+)p i(-)gamma events the following results were obtained: B(phi --> f(0)(9 80)gamma) < 1 x 10(-4) for destructive and B(phi --> f(0)(980)gamma) < 7 x 10(-4) for constructive interference with the Bremsstrahlung proc ess respectively, B(phi --> gamma --> pi(+)pi(-)gamma) < 3 x 10(-5) fo r E-gamma > 20 MeV, B(phi --> rho gamma) < 7 x 10(-4). From the select ed e(+)e(-) --> mu(+)mu(-)gamma events B(phi --> mu(+)mu(-)gamma) = (2 .3 +/- 1.0) x 10(-5) has been obtained for E-gamma > 20 MeV. The upper limit on the P,CP-violating decay eta --> pi(+)pi(-) has also been pl aced: B(eta --> pi(+)pi(-)) < 9 x 10(-4). All upper limits are at 90% C.L. (C) 1997 Published by Elsevier Science.