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We study the effect of a right-handed coupling of quarks to the W-boson onthe measurements of |V_ub| and |V_cb|. It is shown that such a coupling canremove the discrepancies between the determinations of |V_ub| fromB\to\pi\ell\nu, B^+\to\tau^+ \nu and B\to X_u\ell\nu. Further the measurementsof |V_cb| from B\to D^*\ell\nu, B\to D\ell\nu and inclusive B\to X_c\ell\nudecays can be brought into better agreement. We demonstrate that a right-handedcoupling can be generated within the MSSM by a finite gluino-squark loop. Theeffect involves the parameters \delta^{u RL}_{23} and \delta^{u RL}_{13} of thesquark mass matrices, which are poorly constrained from other processes. On theother hand, all gluino-squark corrections to the regular left-handed couplingof the W-boson are found to be too small to be relevant.

Effects of right-handed charged currents on the determinations of |V_ub| and |V_cb|