Study of the Process e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -} in the Energy Region 400 < {radical}(s)< 1000 MeV

Journal Article · Thu Dec 15 04:00:00 EST 2005 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/1.2163921· OSTI ID:20768704

Achasov, M N; Beloborodov, K I; Berdyugin, A V; Bogdanchikov, A G; Bozhenok, A V; Bukin, A D; Bukin, D A; Dimova, T V; Druzhinin, V P; Golubev, V B; Koop, I A; Korol, A A; Koshuba, S V; Lysenko, A P; Otboev, A V; Pakhtusova, E V; Serednyakov, S I; Shatunov, Yu M; Sidorov, V A; Silagadze, Z K ^[1]

---

1. Budker Institute of Nuclear Physics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 (Russian Federation)

The cross section of the process e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -} was measured in the spherical neutral detector experiment at the VEPP-2M collider in the energy region 400 < {radical}(s)< 1000 MeV. This measurement was based on about 12.4 x 10{sup 6} selected collinear events, which include 7.4 x 10{sup 6} e{sup +}e{sup -} {yields} e{sup +}e{sup -}, 4.5 x 10{sup 6} e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -}, and 0.5 x 10{sup 6} e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -} selected events. The systematic uncertainty of cross section determination is 1.3%. The {rho}-meson parameters were determined as m{sub {rho}} = 774.9 {+-} 0.4 {+-} 0.5 MeV, {gamma}{sub {rho}} = 146.5 {+-} 0.8 {+-} 1.5 MeV, and {sigma}({rho} {yields} {pi}{sup +}{pi}{sup -}) = 1220 {+-} 7 {+-} 16 nb and the parameters of the G-parity suppressed decay {omega} {yields} {pi}{sup +}{pi}{sup -} as {sigma}({omega} {yields} {pi}{sup +}{pi}{sup -}) = 29.9 {+-} 1.4 {+-} 1.0 nb and {phi}{sub {rho}}{sub {omega}} = 113.5 {+-} 1.3 {+-} 1.7 deg.

• OSTI ID: 20768704
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 6 Vol. 101; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ELECTROPRODUCTION
G PARITY
HADRONIC PARTICLE DECAY
MEV RANGE 100-1000
MUONS MINUS
MUONS PLUS
OMEGA BARYONS
PAIR PRODUCTION
PIONS MINUS
PIONS PLUS
POSITRONS
RHO-770 MESONS
SPHERICAL CONFIGURATION