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Cross section of the reaction e(+)e(-) -> pi(+)pi(-)pi(+)pi(-) below 1 GeVat CMD-2

Authors

Akhmetshin, RR Anashkin, EV Arpagaus, M Aulchenko, VM Banzarov, VS Barkov, LM Bashtovoy, NS Bondar, AE Bondarev, DV Bragin, AV Chernyak, DV Eidelman, SI Fedotovitch, GV Gabyshev, NI Grebeniuk, AA Grigoriev, DN Hughes, VW Karpov, SV Kazanin, VF Khazin, BI Koop, IA Korostelev, MS Krokovny, PP Kurdadze, LM Kuzmin, AS Logashenko, IB Lukin, PA Mikhailov, KY Milstein, AI Nesterenko, IN Okhapkin, VS Otboev, AV Polunin, AA Popov, AS Purlatz, TA Root, NI Ruban, AA Ryskulov, NM Shamov, AG Shatunov, YM Shwartz, BA Sibidanov, AL Sidorov, VA Skrinsky, AN Smakhtin, VP Snopkov, IG Solodov, EP Stepanov, PY Sukhanov, AI Thompson, JA Titov, VM Valishev, AA Yudin, YV Zverev, SG

Citation

Rr. Akhmetshin et al., Cross section of the reaction e(+)e(-) -> pi(+)pi(-)pi(+)pi(-) below 1 GeVat CMD-2, PHYS LETT B, 475(1-2), 2000, pp. 190-197

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICS LETTERS B

ISSN journal

03702693 → ACNP

Volume

475

Issue

1-2

Year of publication

2000

Pages

190 - 197

Database

ISI

SICI code

0370-2693(20000224)475:1-2<190:CSOTRE>2.0.ZU;2-N

Abstract

Using 3.07 pb(-1) of data collected in the energy range 0.60-0.97 GeV by CM D-2, about 150 events of the process e(+)e(-) --> pi(+) pi(-) pi(+) pi(-) h ave been selected. The energy dependence of the cross section agrees with t he assumption of the alpha(1)(1260)pi intermediate state which is dominant above 1 GeV. For the first time pi(+) pi(-) pi(+) pi(-) events are observed at the rho meson energy. Under the assumption that all these events come f rom the rho meson decay, the value of the cross section at the rho meson pe ak corresponds to the following decay width: Gamma(rho(0) --> pi(+) pi(-) pi(+) pi(-)) = (2.8 +/- 1.4 +/- 0.5) keV or to the branching ratio B(rho(0) --> pi(+) pi(-) pi(+) pi(-)) = (1.8 +/- 0.9 +/- 0.3) . 10(-5). (C) 2000 Published by Elsevier Science B.V. All rights reserved.