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Repercussions of flavour symmetry breaking on CP violation in D-meson decays

  • Thorsten Feldmann
  • Soumitra Nandi
  • Amarjit Soni
Article

Abstract

We investigate to what extent the recently measured value for a non-vanishing direct CP asymmetry in D 0 → K + K and D0 → π + π decays can be accommodated in the Standard Model (SM) or extensions with a constrained flavour sector, for instance from a sequential 4th generation of quarks (4 G). From the comparison with D 0 → K π + branching ratios, we establish large U-spin symmetry (ds) breaking effects with large strong phases between different interfering amplitudes. On the basis of conservative estimates on amplitude ratios — which are supported by an analysis of the breaking of a cu symmetry in non-leptonic B0 decays — we find that, in the SM, direct CP asymmetries in the π + π or K + K modes (or in their difference) of the order of several per mille are still plausible. Due to the constraints on the new CP phases in the 4 G model, only moderate effects compared to the SM estimates are possible. We suggest CP studies at LHCb as well as at (Super)B-factories of several distinctive modes, such as D + → \( \overline K \) (∗)0 π +, ϕπ + and D s  → K (∗)0 π +, ϕπ +(K +) etc., which should shed more light on the short- and long-distance issues underlying CP violation in non-leptonic D-meson decays.

Keywords

Rare Decays CP violation Standard Model Beyond Standard Model 

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Copyright information

© SISSA, Trieste, Italy 2012

Authors and Affiliations

  • Thorsten Feldmann
    • 1
  • Soumitra Nandi
    • 1
  • Amarjit Soni
    • 2
  1. 1.Theoretische Elementarteilchenphysik, Naturwissenschaftlich Technische FakultatUniversit¨at SiegenSiegenGermany
  2. 2.Physics DepartmentTheory Group, Brookhaven National LaboratoryUptonU.S.A

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