MEASUREMENT OF THE DECAY OF THE GAMMA-(1S) AND GAMMA(2S) RESONANCES TO MUON PAIRS

被引：0

作者：

KOBEL, M

ANTREASYAN, D

BARTELS, HW

BESSET, D

BIELER, C

BIENLEIN, JK

BIZETTI, A

BLOOM, ED

BROCK, I

BROCKMULLER, K

CABENDA, R

CARTACCI, A

CAVALLISFORZA, M

CLARE, R

COMPAGNUCCI, A

CONFORTO, G

COOPER, S

COWAN, R

COYNE, D

ENGLER, A

FAIRFIELD, K

FOLGER, G

FRIDMAN, A

GAISER, J

GELPHMAN, D

GLASER, G

GODFREY, G

GRAAF, K

HEIMLICH, FH

HEINSIUS, FH

HOFSTADTER, R

IRION, J

JAKUBOWSKI, Z

JANSSEN, H

KARCH, K

KEH, S

KIEL, T

KILIAN, H

KIRKBRIDE, I

KLOIBER, T

KOCH, W

KONIG, AC

KONIGSMANN, K

KRAEMER, RW

KRUGER, S

LANDI, G

LEE, R

LEFFLER, S

LEKEBUSCH, R

LESIAK, T

机构：

[1] CALTECH, PASADENA, CA 91125 USA

[2] UNIV CALIF SANTA CRUZ, SANTA CRUZ, CA 95064 USA

[3] CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA

[4] CRACOW INST NUCL PHYS, PL-30055 KRAKOW, POLAND

[5] DESY, W-2000 HAMBURG, GERMANY

[6] UNIV FLORENCE, I-50121 FLORENCE, ITALY

[7] IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY

[8] UNIV HAMBURG, INST EXPTL PHYS 1, W-2000 HAMBURG 13, GERMANY

[9] NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS

[10] HARVARD UNIV, CAMBRIDGE, MA 02138 USA

[11] HEPL, DEPT PHYS, STANFORD, CA 94305 USA

[12] CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS

[13] STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94305 USA

[14] PRINCETON UNIV, PRINCETON, NJ 08544 USA

[15] UNIV WURZBURG, W-8700 WURZBURG, GERMANY

[16] CENS, DPHPE, F-91191 GIF SUR YVETTE, FRANCE

[17] CERN, CH-1211 GENEVA 23, SWITZERLAND

[18] AGH UNIV SCI & TECHNOL, INST PHYS & NUCL TECHN, PL-30055 KRAKOW, POLAND

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1992年 / 53卷 / 02期

关键词：

D O I：

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中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Using the Crystal Ball detector at the e+e-storage ring DORIS II, we have measured the branching fraction to muon pairs B(mu-mu) of the UPSILON(1S) and UPSILON(2S) resonances and for the first time the product of the muonic partial width GAMMA(mu-mu) and the branching fraction to electrons B(ee) for both resonances. We obtain B(mu-mu) (1S) = (2.31 +/- 0.12 +/- 0.10)%, GAMMA(mu-mu) (1S) . B(ee) (1S) = (31.2 +/- 1.6 +/- 1.7) eV, and B(mu-mu) (2S) = (1.22 +/- 0.28 +/- 0.19)%, GAMMA(mu-mu) (2S) . B(ee) (2S) = (6.5 +/- 1.5 +/- 1.0) eV. Inserting the present world average value of B(ee) (1S) = (2.52 +/- 0.17)%, we determine the muonic partial width of the UPSILON(1S) as GAMMA(mu-mu) (1S) = (1.24 +/- 0.06 +/- 0.11) keV. In addition, we present the first indication of the expected interference between mu-pair production in the continuum and in UPSILON(1S) decays.

引用

页码：193 / 205

页数：13

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