Charmless final states and S- and D-wave mixing in the ψ -: art. no. 094002

The psi= psi (3770) resonance is expected to be mainly c (c) over bar (1 D-3(1)), but tensor forces and coupling to charmed particle pairs can mix it with psi'(2 S-3(1)) and other states. The implications of this mixing for decays of psi to noncharmed final states are discussed. (i) The ratio Gamma(psi --> gamma+chi (c2))/Gamma(psi --> gamma+chi (c0)) is expected to be highly suppressed if psi is a pure D-wave state, and is enchanced by mixing. (ii) The expected decay psi'--> rho pi and other missing modes can appear as corresponding psi partial widths. enhanced by a factor depending on the mixing angle, General arguments then suggest a branching ratio of about 1%, give or take a factor of 2, for charmless hadronic decays of psi. (iii) Enhancements can appear in penguin amplitudes in B decays, B -->K eta' branching ratios, and direct CP-violating asymmetries in B -->K pi decays.