Aspects of the chirality of weak b→c transitions in the exclusive semi-leptonic decay B(b)→D*(c)+l-+anti νl

We consider the four-body angular decay distribution in the cascade decay anti B0→D*+(→Dπ)+l-+anti νl. We identify the parity violating (PV) angular contributions that are sensitive to the difference H+-H- of the transverse current-induced B→D* helicity amplitudes. The sign of these PV contributions directly reflects the chirality of the underlying weak b→c transition. We define two asymmetry observables that are sensitive to the PV difference H+-H-. The corresponding asymmetries are calculated in a specific spectator quark model. (orig.)