Hard approximation in two-particle hadronic decays of Bc at large recoils
Abstract
The two-particle decays of Bc+ to psi pi+(rho+) and Bc+ to etac pi+(rho+) are considered in a way taking into account a soft binding of quarks in the heavy quarkonia and a hard gluon exchange between the constituents at large recoil momenta of psi(etac). An approximate double enhancement of the amplitudes is found because of the nonspectator t-channel contribution.
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