A Direct measurement of the J / Psi leptonic branching fraction
Journal
Physical Review Letters
Journal Volume
68
Pages
282-285
Date Issued
1991-07
Author(s)
Coffman, D.
Abstract
The Mark III Collaboration has measured the J/ leptonic branching fractions using the process (2S)+-J/, J/l+l-. The results are B(J/e+e-)=(5.92±0. 15±0.20)% and B(J/+-)=(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/ is (5.91±0.11±0.20)%. This result is used to obtain the strong coupling constant ±s and the QCD scale factor MS (MS» denotes the modified minimal-subtraction scheme). © 1992 The American Physical Society.
Type
journal article