A Search for the Rare and Forbidden Decays $D^0 \to V l^+l^-$

Abstract

I report the results of a search for flavor-changing neutral current, leptonflavor, and lepton-number violating decays of the 3 and 4-body decay modes of the D 0 (and its antiparticle) containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, I examine modes with two leptons and either a ρ 0 , K * 0 , or φ vector meson or a non-resonant ππ, Kπ, or KK pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, branching-fraction upper limits, typically at the 10 −4 level, are presented at the 90% confidence level for the 27 decay modes examined. Of these searches, 18 are investigations of decays without previous published results; several others have significantly improved sensitivity over previous results. v

The glueball among the light scalar mesons

“…A related process is the hadronic decay D + → K − π + π − studied by the E791 Collaboration [14]. The Dalitz plot shows again the presence of the K * (890) and K * 0 (1430).…”