DETERMINATION OF THE BRANCHING RATIO OF THE DECAY PI(0)-]E(+)E(-)

被引：11
作者：
DESHPANDE, A
ALLIEGRO, C
CHALOUPKA, V
EGGER, J
GORDON, HA
HADLEY, NJ
HEROLD, WD
KASPAR, H
LEE, AM
LAZARUS, DM
LUBATTI, HJ
MA, H
REHAK, P
SHUKLA, A
ZELLER, ME
ZHAO, T
机构：
[1] BROOKHAVEN NATL LAB,UPTON,NY 11973
[2] UNIV MARYLAND,COLL PK,MD 20742
[3] SWISS INST NUCL RES,PAUL SCHERRER INST,CH-5234 VILLIGEN,SWITZERLAND
[4] UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195
来源：
PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.71.27
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Employing the decay chain K+ --> pi+pi0, pi0 --> e+e- we have observed the decay pi0 --> e+e-. With a signal sample of almost-equal-to 21 events we measure the branching ratio for pi0 --> e+e- to be (6.9 +/-2.3 +/- 0.6) x 10(-8), normalized to the decay K+ --> pi+pi0, pi0 --> e+e-gamma. This result is consistent with the unitarity lower bound and the published 90% confidence level upper limit of 13 x 10(-8).
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页码：27 / 30
页数：4
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