An experiment has been performed to search for the muon- and electron-numbe
r nonconserving decay mu(+) --> e(+)gamma. The upper limit for the branchin
g ratio is found to be Gamma(mu(+) --> e(+)gamma)/Gamma(mu(+) --> e(+)nu<(n
u)over bar>) < 1.2 X 10(-11) with 90% confidence.