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

Understand

We study the effect of a right-handed coupling of quarks to the W-boson on the measurements of |V_ub| and |V_cb|.

• It is shown that such a coupling can remove the discrepancies between the determinations of |V_ub| from B\to\pi\ell\nu, B^+\to\tau^+ \nu and B\to X_u\ell\nu.
• Further the measurements of |V_cb| from B\to D^*\ell\nu, B\to D\ell\nu and inclusive B\to X_c\ell\nu decays can be brought into better agreement.
• We demonstrate that a right-handed coupling can be generated within the MSSM by a finite gluino-squark loop.