A MEASUREMENT OF THE ELECTRONIC WIDTHS GAMMA-EE OF THE UPSILON(1S), UPSILON(2S), AND UPSILON(4S) RESONANCES, AND OF THE TOTAL DECAY WIDTH-GAMMA OF THE UPSILON(4S)

Authors
ALBRECHT H HAMACHER T HOFMANN RP KIRCHHOFF T MANKEL R NAU A NOWAK S RESSING D SCHRODER H SCHULZ HD WALTER M WURTH R HAST C KAPITZA H KOLANOSKI H KOSCHE A LANGE A LINDNER A SCHIEBER M SIEGMUND T SPAAN B THURN H TOPFER D WEGENER D ECKSTEIN P SCHMIDTLER M SCHRAMM M SCHUBERT KR SCHWIERZ R WALDI R REIM K WEGENER H ECKMANN R KUIPERS H MAI O MUNDT R OEST T REINER R SCHMIDTPARZEFALL W FUNK W STIEWE J WERNER S EHRET K HOFMANN W HUPPER A KNOPFLE KT SPENGLER J KRIEGER P MACFARLANE DB PRENTICE JD SAULL PRB TZAMARIUDAKI K VANDEWATER RG YOON TS FRANKL C SCHNEIDER M WESELER S KERNEL G KRIZAN P KRIZNIC E PODOBNIK T ZIVKO T BALAGURA V BARSUK S BELYAEV I CHISTOV R DANILOV M GERSHTEIN L GERSHTEIN Y GOLUTVIN A KOROLKO I KOSTINA G LITVINTSEV D PAKHLOV P SEMENOV S SNIZHKO A TICHOMIROV I ZAITSEV Y
Citation
H. Albrecht et al., A MEASUREMENT OF THE ELECTRONIC WIDTHS GAMMA-EE OF THE UPSILON(1S), UPSILON(2S), AND UPSILON(4S) RESONANCES, AND OF THE TOTAL DECAY WIDTH-GAMMA OF THE UPSILON(4S), Zeitschrift fur Physik. C, Particles and fields, 65(4), 1995, pp. 619-625
Citations number
36
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
65
Issue
4
Year of publication
1995
Pages
619 - 625
Database
ISI
SICI code
0170-9739(1995)65:4<619:AMOTEW>2.0.ZU;2-G
Abstract
The partial decay width into electrons, Gamma(ee), of the Upsilon(1S) and Upsilon(2S) resonances have been measured the detector ARGUS at th e e(+)e(-) storage ring DORIS II of DESY. Applying the formula of Kura ev and Fadin for the radiative corrections we find: Gamma(ee)(Upsilon( 1S)) = (1.32 +/- 0.04 +/- 0.03) keV and Gamma(ee)(Upsilon(2S)) = (0.52 +/- 0.03 +/- 0.01) keV. The total decay width of the Upsilon(4S) reso nance and its partial width into electrons have been determined as wel l. Fitting the data with a generalized Breit-Wigner function with an e nergy dependent decay width Gamma(s) and a mass shift function m(s), w e obtain the following resonance parameters: Gamma(M(2)) = (10.0 +/- 2 .8 +/- 2.7) MeV, Gamma(ee) = (0.28 +/- 0.05 +/- 0.01) keV and B-ee = ( 2.77 +/- 0.50 +/- 0.49). 10(-5). We argue that the disagreement of thi s result with the world average originates from our more adequate para metrization of the observed Upsilon(4S) resonance cross section.