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+====== 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]]   |
+| |