DIRECT MEASUREMENT OF THE J/PSI LEPTONIC BRANCHING FRACTION

被引：26

作者：

COFFMAN, D

DEJONGH, F

DUBOIS, GP

EIGEN, G

HITLIN, DG

MATTHEWS, CG

RICHMAN, J

WEINSTEIN, AJ

WISNIEWSKI, WJ

ZHU, Y

BOLTON, T

BUNNELL, KO

CASSELL, RE

COWARD, DH

KIM, PC

LABS, J

ODIAN, A

PITMAN, D

SCHINDLER, RH

TOKI, W

WASSERBAECH, S

DRINKARD, JJ

GATTO, C

HEUSCH, CA

LOCKMAN, WS

SADROZINSKI, HFW

SCARLATELLA, M

SCHALK, TL

SEIDEN, A

XU, R

EISENSTEIN, BI

FREESE, T

GLADDING, G

IZEN, JM

STOCKDALE, IE

TRIPSAS, B

MALLIK, U

WANG, MZ

BROWN, JS

BURNETT, TH

LI, AD

MIR, R

MOCKETT, PM

NEMATI, B

PARRISH, L

WILLUTZKI, H

机构：

[1] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305

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

[3] UNIV ILLINOIS,URBANA,IL 61801

[4] UNIV WASHINGTON,SEATTLE,WA 98195

[5] UNIV IOWA,IOWA CITY,IA 52242

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.68.282

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Mark III Collaboration has measured the J/psi leptonic branching fractions using the process psi(2S) --> pi+ pi- J/psi, J/psi --> l+ l-. The results are B(J/psi --> e+ e-) = (5.92 +/- 0.15 +/- 0.20)% and B(J/psi --> mu+ mu-) = (5.90 +/- 0.15 +/- 0.19)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is (5.91 +/- 0.11 +/- 0.20)%. This result is used to obtain the strong coupling constant alpha(s) and the QCD scale factor LAMBDA(MSBAR) (MSBAR denotes the modified minimal subtraction scheme).

引用

页码：282 / 285

页数：4

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