Short Distance Analysis of ¯ B → D (∗)0 e + e − and ¯ B → J/ψe + e −

Over a large fraction of phase space a combination of an operator product and heavy quark expansions effectively turn the decay B̄ → D(∗)0e+e− into a “short distance” process, i.e., one in which the weak and electromagnetic interactions occur through single local operators. These processes have an underlying W-exchange quark diagram topology and are therefore Cabibbo allowed but suppressed by combinatoric factors and short distance QCD corrections. Our technique allows a clearer exploration of these effects. For the decay B̄d,s → J/ψ(ηc)ee one must use a non-relativistic (NRQCD) expansion, in addition to an operator product expansion and a heavy quark effective theory expansion. We estimate the decay rates for B̄d,s → J/ψe+e−, B̄d,s → ηcee, B̄d,s → D∗0e+e− and B̄d,s → D0e+e−. PACS numbers: 13.20.He, 12.39.Hg [email protected] [email protected] [email protected] 1