Study of the Process e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -} in the Energy Region 400 < {radical}(s)< 1000 MeV
- 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, Vol. 101, Issue 6; Other Information: Translated from Zhurnal Ehksperimental'noj i Teoreticheskoj Fiziki, ISSN 0044-4510, 128, 1201-1219 (No. 6, 2005); DOI: 10.1134/1.2163921; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evidence of {phi}{yields}{pi}{sup 0}{pi}{sup 0}{gamma} and {phi}{yields}{pi}{sup 0}{eta}{gamma} decays in SND experiment at VEPP-2M
Searching for the process e{sup +}e{sup -} {yields} K{sup +}K{sup -}{pi}{sup 0} in experiments with the spherical neutral detector at VEPP-2M
Related Subjects
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