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Durham University

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Publication details

Bobeth, Christoph, Haisch, Ulrich, Lenz, Alexander, Pecjak, Ben & Tetlalmatzi-Xolocotzi, Gilberto (2014). On new physics in Delta Gammad. Journal of High Energy Physics 2014(6): 40.

Author(s) from Durham


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 (d¯¯¯p)(p¯¯¯′b) with p, p′ = u, c as well as (d¯¯¯p)(τ¯¯¯τ). 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.