# Differences

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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]] | | ||

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