Using a data set of 2.93 fb$^{-1}$ taken at a center-of-mass energy of
$sqrt{s}$ = 3.773 GeV with the BESIII detector at the BEPCII collider, we
measure the process $e^+e^-
ightarrow J/psigamma
ightarrow
mu^+mu^-gamma$ and determine the product of the branching fraction and the
electronic width $mathcal B_{mumu}cdot Gamma_{ee} = (333.4 pm 2.5_{
m
stat} pm 4.4_{
m sys})$~eV. Using the earlier-published BESIII result for
$mathcal B_{mumu}$ = (5.973 $pm$ 0.007$_{
m stat}$ $pm$ 0.037$_{
m
sys}$)\%, we derive the $J/psi$ electronic width $Gamma_{ee}$~= (5.58 $pm$
0.05$_{
m stat}$ $pm$ 0.08$_{
m sys}$) keV.
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
REGISTER
Did you like this article? 
