====== TTP09-24 Effects of right-handed charged currents on the determinations of |V_{ub}| and |V_{cb}| ======
 
 
   <hidden TTP09-24  Effects of right-handed charged currents on the determinations of |V_{ub}| and |V_{cb}| > 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. The effect involves the parameters
   \delta^{u RL}_{23} and \delta^{u RL}_{13} of the squark mass
   matrices, which are poorly constrained from other processes. On the
   other hand, all gluino-squark corrections to the regular left-handed
   coupling of the W-boson are found to be too small to be relevant.
 </hidden>
|**Andreas Crivellin**  | 
|** Phys.Rev. D81 031301 2010  **  |
| {{preprints:2009:ttp09-24.pdf|PDF}} {{preprints:2009:ttp09-24.ps|PostScript}} [[http://arxiv.org/abs/0907.2461|arXiv]]   |
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