Abstract
Motivated by the recent measurement of the dimuon asymmetry by the DØ collaboration, which could be interpreted as an enhanced decay rate difference in the neutral B d -meson system, we investigate the possible size of new-physics contributions to ΔΓ d . In particular, we perform model-independent studies of non-standard effects associated to the dimension-six current-current operators (\( \overline{d}p \))(\( \overline{p} \)′b) with p, p′ = u, c as well as (\( \overline{d}p \))(\( \overline{\tau}\tau \)). In both cases we find that for certain flavour or Lorentz structures of the operators sizeable deviations of ΔΓ d away from the Standard Model expectation cannot be excluded in a model-independent fashion.
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Bobeth, C., Haisch, U., Lenz, A. et al. On new physics in ΔΓ d . J. High Energ. Phys. 2014, 40 (2014). https://doi.org/10.1007/JHEP06(2014)040
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DOI: https://doi.org/10.1007/JHEP06(2014)040