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preprints:2006:ttp06-33 [2016/03/17 11:03] (current)
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 +====== TTP06-33 B_d and B_s mixing: mass and width differences and CP violation ====== 
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 +   <​hidden TTP06-33 ​ B_d and B_s mixing: mass and width differences and CP violation > B-B-bar mixing involves three physical parameters: the magnitudes of the 
 + ​off-diagonal elements of the mass and decay matrices and their relative 
 + ​phase. ​ They are related to the mass and width differences between the 
 + mass eigenstates and to the CP asymmetry in flavour-specific decays, 
 + a_fs. Introducing a new operator basis I present new, more precise 
 + ​theory predictions for the width differences in the B_s and B_d systems: 
 + in the Standard Model one finds Delta Gamma_s = 0.088 +/- 0.017 ps^{-1} 
 + and Delta Gamma_d = (26.7 +5.8/-6.5) * 10^{-4} ps^{-1}. ​ Updates 
 + of the mass differences Delta M_d and Delta M_s and of a_{fs}^d and 
 + ​a_{fs}^s are also presented. ​ Then I discuss how various present and 
 + ​future measurements can be combined to constrain new physics. The 
 + ​extraction of a new CP phase phi_s^Delta from data on a_{fs}^s also 
 + ​profits from our new operator basis. ​ Confronting our new formulae with 
 + D0 data we find that sin phi_s^Delta deviates from zero by 2 sigma. 
 + </​hidden>​ 
 +|**Ulrich Nierste** ​ |  
 +|**  Nucl.Phys.Proc.Suppl. ​ 170 135-140 2007  **  | 
 +| {{preprints:​2006:​ttp06-33.pdf|PDF}} {{preprints:​2006:​ttp06-33.ps|PostScript}} [[http://​arxiv.org/​abs/​hep-ph/​0612310|arXiv]] ​  | 
 +| |