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Measurement of $CP$ asymmetry in the $D^{0} \to K^0_S K^0_S$ decay at Belle

Publication ,  Journal Article
Abdesselam, A; Adachi, I; Adamczyk, K; Aihara, H; Said, SA; Arinstein, K; Arita, Y; Asner, DM; Aso, T; Atmacan, H; Aulchenko, V; Aushev, T ...
September 20, 2016

We report a measurement of the time-integrated $CP$ asymmetry in the neutral charm meson decay $D^0 \to K^0_S K^0_S$ using 921~fb$^{-1}$ data collected at the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The observed asymmetry is $$ A_{CP}(D^0 \to K^0_S K^0_S) = (-0.02 \pm 1.53 \pm 0.17) \%, $$ where the first uncertainty is statistical and the second systematic. This latter uncertainty is dominated by the error of the normalisation channel. The result is consistent with Standard Model expectations and improves the uncertainty with respect to previous measurement of this quantity by more than a factor of three.

Duke Scholars

Publication Date

September 20, 2016
 

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Abdesselam, A., Adachi, I., Adamczyk, K., Aihara, H., Said, S. A., Arinstein, K., … Zyukova, O. (2016). Measurement of $CP$ asymmetry in the $D^{0} \to K^0_S K^0_S$ decay at Belle.
Abdesselam, A., I. Adachi, K. Adamczyk, H. Aihara, S Al Said, K. Arinstein, Y. Arita, et al. “Measurement of $CP$ asymmetry in the $D^{0} \to K^0_S K^0_S$ decay at Belle,” September 20, 2016.
Abdesselam A, Adachi I, Adamczyk K, Aihara H, Said SA, Arinstein K, et al. Measurement of $CP$ asymmetry in the $D^{0} \to K^0_S K^0_S$ decay at Belle. 2016 Sep 20;
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Publication Date

September 20, 2016