Cross section of the reaction e+e- → π+π-π+π- below 1 GeV at CMD-2

被引：57

作者：

Akhmetshin, RR ^{[1
]}

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

机构：

[1] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, Novosibirsk 630090, Russia

[3] Yale Univ, New Haven, CT 06511 USA

[4] Univ Pittsburgh, Pittsburgh, PA 15260 USA

来源：

PHYSICS LETTERS B | 2000年 / 475卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(00)00043-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using 3.07 pb(-1) of data collected in the energy range 0.60-0.97 GeV by CMD-2, about 150 events of the process e(+)e(-) --> pi(+) pi(-) pi(+) pi(-) have been selected. The energy dependence of the cross section agrees with the 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 from the rho meson decay, the value of the cross section at the rho meson peak 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.

引用

页码：190 / 197

页数：8

共 50 条

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