Search for violation and measurement of the branching fraction in the decay $D^{0} to K^0_S K^0_S$

Dash, N.*; Tanida, Kiyoshi ; Belle Collaboration*; 198 of others*

We report a study of the decay $D^{0} to K^0_S K^0_S$ using 921 fb $^{-1}$ of data collected at or near the and resonances with the Belle detector at the KEKB asymmetric energy collider. The measured time-integrated asymmetry is $A_{CP}(D^{0} to K^0_S K^0_S)=(-0.02 pm 1.53 pm 0.02 pm 0.17)%$ , and the branching fraction is $B(D^{0} to K^0_S K^0_S)=(1.321 pm 0.023 pm 0.036 pm 0.044) times 10^{-4}$ , where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode ( $D^{0} to K^0_S pi^0$ ). These results are significantly more precise than previous measurements available for this mode. The $A_{CP}$ measurement is consistent with the standard model expectation.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	119
Number	:	17
Pages	:	p.171801_1 - 171801_7
Publication Year/Month	:	2017/10
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PDF	:	AA2017-0514.pdf:0.35MB
Paper URL	:	https://doi.org/10.1103/PhysRevLett.119.171801
DOI for research data	:
Keywords	:	CP非対称性
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Article of JAEA R&D Review	:
Cooperating Institute	:	高エネルギー加速器研究機構

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Registration No. : AA20170514
JAEA Abstracts No. : 46000678
Paper Submission No. : 20259

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