We report a study of the decay D0→KS0KS0 using 921 fb-1 of data collected at or near the (4S) and (5S) resonances with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured time-integrated CP asymmetry is ACP(D0→KS0KS0)=(-0.02±1.53±0.02±0.17)%, and the branching fraction is B(D0→KS0KS0)=(1.321±0.023±0.036±0.044)×10-4, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D0→KS0π0). These results are significantly more precise than previous measurements available for this mode. The ACP measurement is consistent with the standard model expectation.

Язык оригиналаанглийский
Номер статьи171801
Число страниц7
ЖурналPhysical Review Letters
Номер выпуска17
СостояниеОпубликовано - 23 окт 2017

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