Institute for Theoretical Particle Physics (TTP)

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preprints:2009:ttp09-24 [2016/03/17 11:03] (current)
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 +====== TTP09-24 Effects of right-handed charged currents on the determinations of |V_{ub}| and |V_{cb}| ====== 
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 +   <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]]   | 
 +| |