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Search for CP violation in D^0 -> pi^0 pi^0 decays · Around

2014

Search for CP violation in D^0 -> pi^0 pi^0 decays

Nisar, N. K., Trabelsi, K., Mohanty, G. B. et al.

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We search for CP violation in neutral charm meson decays using a data sample with an integrated luminosity of 966 fb^-1 collected with the Belle detector at the KEKB e+e- asymmetric-energy collider.

The asymmetry obtained in the rate of D^0 and D^0-bar decays to the pi^0 pi^0 final state, [-0.03+-0.64(stat)+-0.10(syst)]%, is consistent with no CP violation.
This constitutes an order of magnitude improvement over the existing result.
We also present an updated measurement of the CP asymmetry in the D^0 -> K_S pi^0 decay: A_{CP}(D^0 -> K_S pi^0) = [-0.21+-0.16(stat)+-0.07(syst)]%.

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Throughout this Letter, the charge-conjugate decay mode is implied unless stated otherwise

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