HEP Seminar: On New Physics on ΔΓd

Dr Tetlalmatzi-Xolocotzi, Durham University

Friday 24 October 2014, 1330-1500
C1 Physics Building

Motivated by the recent measurement of the di-muon asymmetry by the D∅ collaboration, which could be interpreted as an enhanced decay rate difference in the neutral Bd-meson system, we investigate the possible size of new-physics contributions to ΔΓd. In particular, we perform model-independent studies of non-standard effects associated to the dimension-six current-current operators (d̅p)(p̅’b) with p,p’=u,c as well as (d̅b)(τ̅τ). In both cases we find that for certain flavour or Lorentz structures of the operators sizeable deviations of ΔΓd away from the Standard Model expectation cannot be excluded in a model-independent fashion.