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).

引用

页码：27 / 30

页数：4

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