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

$$D^{0} to K^0_S K^0_S$$崩壊の分岐比測定と、$$CP$$の破れの探索

Dash, N.*; 谷田 聖; Belle Collaboration*; 他198名*

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 $$Upsilon(4S)$$ and $$Upsilon(5S)$$ resonances with the Belle detector at the KEKB asymmetric energy $$e^+e^-$$ collider. The measured time-integrated $$CP$$ 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.

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パーセンタイル:19.27

分野:Physics, Multidisciplinary

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