The hadronic cross section of electron-positron annihilation at 9.5 GeV and the ϒ and ϒ′ resonance parameters
1982; Elsevier BV; Volume: 116; Issue: 5 Linguagem: Inglês
10.1016/0370-2693(82)90305-7
ISSN1873-2445
AutoresH. Albrecht, R. Childers, C.W. Darden, G. Drews, H. Hasemann, W. Schmidt‐Parzefall, H. Schröder, H.D. Schulz, F. Selonke, E. Steinmann, R. Wurth, W. Hofmann, A. Markees, D. Wegener, K. R. Schubert, J. Stiewe, R. Waldi, S. Weseler, P. Böckmann, L. Jönsson, M. Danilov, Yu. A. Semënov, I. Tichomirov, Yu. Zaitsev,
Tópico(s)Quantum Chromodynamics and Particle Interactions
ResumoThe reaction e+e−→ hadrons has been measured in the ϒ and ϒ′ region using the DASP detector at the DESY storage ring DORIS. The following final results are obtained: Rhad(9.5 GeV)=3.73±0.16±0.28, Γee(ϒ)=(1.23 ± 0.08 ± 0.12) keV, Bμμ(ϒ)=(3.2±1.3±0.3)%, ΓeeΓhadΓtot(ϒ′)=(0.55±0.11 ±0.06) keV, and M(ϒ′)−M(ϒ)=(556 ±10) MeV.
Referência(s)