MEASUREMENT OF THE BRANCHING RATIO OF PI(0)-]E(+)E(-) FROM PI(0)S PRODUCED BY K(L)-]PI(0)PI(0)PI(0) DECAYS IN FLIGHT

被引：16

作者：

MCFARLAND, KS

BRIERE, RA

CHEU, E

HARRIS, DA

MAKOFF, G

ROODMAN, A

SCHWINGENHEUER, B

SOMALWAR, SV

WAH, YW

WINSTEIN, B

WINSTON, R

ARISAKA, K

ROBERTS, D

SLATER, W

WEAVER, M

BARKER, AR

SWALLOW, EC

BOCK, GJ

COLEMAN, R

CRISLER, M

ENAGONIO, J

FORD, R

HSIUNG, YB

JENSEN, DA

RAMBERG, E

TSCHIRHART, R

COLLINS, EM

GOLLIN, GD

NAKAYA, T

YAMANAKA, T

GU, P

HAAS, P

HOGAN, WP

KIM, SK

MATTHEWS, JN

MYUNG, SS

SCHNETZER, S

THOMSON, GB

ZOU, Y

机构：

[1] UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024

[2] UNIV COLORADO,BOULDER,CO 80309

[3] ELMHURST COLL,ELMHURST,IL 60126

[4] FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510

[5] UNIV ILLINOIS,URBANA,IL 61801

[6] OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN

[7] RUTGERS UNIV,PISCATAWAY,NJ 08855

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.71.31

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Fermilab E799 Collaboration has carried out a search for the rare decay pi0 --> e+e- using pi0's produced from K(L) --> pi0pi0pi0 decays in flight. We observe a signal of nine events with an e+e-mass close to the pi0 mass where only one event is predicted from other known processes. From this, we measure B(pi0 --> e+e-, (m(ee)/m(pi0))2 > 0.95) = [7.6(-2.8)+3.9(stat) +/- 0.5 (syst)] x 10(-8), over and above the contribution from pi0 Dalitz decays. Correcting for radiative effects, we find this result consistent with theoretical expectations from standard-model processes.

引用

页码：31 / 34

页数：4

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