Charmless final states and S- and D-wave mixing in the psi '' - 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 Gam ma(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 m ixing. (ii) The expected decay psi'--> rho pi and other "missing" modes can appear as corresponding psi" partial widths. enhanced by a factor dependin g 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 e ta' branching ratios, and direct CP-violating asymmetries in B -->K pi deca ys.