Em. Aitala et al., SEARCH FOR THE FLAVOR-CHANGING NEUTRAL-CURRENT DECAYS D-]PI(+)MU(+)MU(-) AND D+-]PI(+)E(+)E(-)(), Physical review letters, 76(3), 1996, pp. 364-367
We report the results of a search for the flavor-changing neutral-curr
ent decays D+ --> pi(+)mu(+)mu(-) and D+ --> pi(+)e(+)e(-) in data fro
m Fermilab charm hadroproduction experiment E791. No signal above back
ground is found, and we obtain upper limits on branching fractions, B(
D+-->pi(+)mu(+)mu(-)) < 1.8 x 10(-5) and B(D+-->pi(+)e(+)e(-)) < 6.6 X
10(-5), at the 90% confidence level.