학술논문
A measurement of the electronic widths Γ ee of the ϒ(1S), ϒ(2S), and ϒ(4S) resonances, and of the total decay width Γ of the ϒ(4S)
Document Type
Original Paper
Author
Albrecht, H.; Hamacher, T.; Hofmann, R. P.; Kirchhoff, T.; Mankel, R.; Nau, A.; Nowak, S.; Reßing, D.; Schröder, H.; Schulz, H. D.; Walter, M.; Wurth, R.; Hast, C.; Kapitza, H.; Kolanoski, H.; Kosche, A.; Lange, A.; Lindner, A.; Schieber, M.; Siegmund, T.; Spaan, B.; Thurn, H.; Töpfer, D.; Wegener, D.; Eckstein, P.; Schmidtler, M.; Schramm, M.; Schubert, K. R.; Schwierz, R.; Waldi, R.; Reim, K.; Wegener, H.; Eckmann, R.; Kuipers, H.; Mai, O.; Mundt, R.; Oest, T.; Reiner, R.; Schmidt-Parzefall, W.; Funk, W.; Stiewe, J.; Werner, S.; Ehret, K.; Hofmann, W.; Hüpper, A.; Knöpfle, K. T.; Spengler, J.; Krieger, P.; MacFarlane, D. B.; Prentice, J. D.; Saull, P. R. B.; Tzamariudaki, K.; Van de Water, R. G.; Yoon, T. -S.; Frankl, C.; Schneider, M.; Weseler, S.; Kernel, G.; Križan, P.; Križnič, E.; Podobnik, T.; Živko, T.; Balagura, V.; Barsuk, S.; Belyaev, I.; Chistov, R.; Danilov, M.; Gershtein, L.; Gershtein, Yu.; Golutvin, A.; Korolko, I.; Kostina, G.; Litvintsev, D.; Pakhlov, P.; Semenov, S.; Snizhko, A.; Tichomirov, I.; Zaitsev, Yu.; ARGUS Collaboration
Source
Zeitschrift für Physik C Particles and Fields. December 1995 65(4):619-625
Subject
Language
English
ISSN
0170-9739
1431-5858
1431-5858
Abstract
The partial decay width into electrons, Γee , of the ϒ(1S) and ϒ(2S) resonances have been measured with the detector ARGUS at thee+ e− storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: Γee (ϒ(1S))= (1.32±0.04±0.03) keV and Γee (ϒ(2S))=(0.52±0.03±0.01) keV. The total decay width of the ϒ(4S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width Γ(s) and a mass shift functionm(s), we obtain the following resonance parameters: Γ(M2 )=(10.0±2.8±2.7) MeV, Γee =(0.28±0.05±0.01)keV andBee =(2.77±0.50±0.49)·10−5 . We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed ϒ(4S) resonance cross section.