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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]] ​  | 
 +| |