Jul 4 – 11, 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

The Standard Model confronts CP violation in D^0 -> pi^+ pi^- and D^0 -> K^+ K^-

Jul 5, 2012, 4:00 PM
Room 220 (Melbourne Convention and Exhibition Centre)

Room 220

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy TR5 & TR7 - Room 220 - B Physics and CP Violation, etc.


Dr Satoshi Mishima (INFN Rome (IT))


The recently measured direct CP asymmetries in the processes D^0 -> pi^+ pi^- and D^0 -> K^+ K^- show a significant deviation from the naive Standard Model expectation. Using a general parameterization of the decay amplitudes, we show that the measured branching ratios imply large SU(3) breaking and large violations of the naive 1/N_c counting. Furthermore, rescattering constrains the I=0 amplitudes in the pi pi and K K channels. Combining all this information, we show that, with present errors, the observed asymmetries are marginally compatible with the Standard Model. Improving the experimental accuracy could lead to an indirect signal of new physics.

Primary authors

Prof. Enrico Franco (INFN Rome) Prof. Luca Silvestrini (INFN Rome) Dr Satoshi Mishima (INFN Rome (IT))

Presentation materials