C P asymmetries in singly-Cabibbo-suppressed D decays to two pseudoscalar mesons

  title={C P asymmetries in singly-Cabibbo-suppressed D decays to two pseudoscalar mesons},
  author={Bhubanjyoti Bhattacharya and Michael Gronau and Jonathan L Rosner},
  journal={Physical Review D},
The LHCb Collaboration has recently reported evidence for a $CP$ asymmetry approaching the percent level in the difference between ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$. We analyze this effect as if it is due to a penguin amplitude with the weak phase of the standard model $c\ensuremath{\rightarrow}b\ensuremath{\rightarrow}u$ loop diagram, but with a $CP$-conserving enhancement… 

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