Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1850356 | Physics Letters B | 2016 | 6 Pages |
Abstract
Using a data set of 2.93 fb−1 taken at a center-of-mass energy of s=3.773 GeV with the BESIII detector at the BEPCII collider, we measure the process e+e−→J/ψγ→μ+μ−γe+e−→J/ψγ→μ+μ−γ and determine the product of the branching fraction and the electronic width Bμμ⋅Γee=(333.4±2.5stat±4.4sys) eVBμμ⋅Γee=(333.4±2.5stat±4.4sys) eV. Using the earlier-published BESIII result for Bμμ=(5.973±0.007stat±0.037sys)%Bμμ=(5.973±0.007stat±0.037sys)%, we derive the J/ψJ/ψ electronic width Γee=(5.58±0.05stat±0.08sys) keVΓee=(5.58±0.05stat±0.08sys) keV.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, M. Albrecht, D.J. Ambrose, A. Amoroso, F.F. An, Q. An, J.Z. Bai, R. Baldini Ferroli, Y. Ban, D.W. Bennett, J.V. Bennett, M. Bertani, D. Bettoni, J.M. Bian, F. Bianchi, E. Boger, I. Boyko, R.A. Briere,