|
新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
|
| 発行・発表の年月 | 2017/05 |
| 形態種別 | その他 |
| 標題 | Search for $CP$ Violation and Measurement of the Branching Fraction in the Decay $D^{0} \to K^0_S K^0_S$ |
| 執筆形態 | その他 |
| 著者・共著者 | N. Dash,S. Bahinipati,V. Bhardwaj,K. Trabelsi,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,V. Aulchenko,T. Aushev,R. Ayad,V. Babu,I. Badhrees,A. M. Bakich,V. Bansal,E. Barberio,B. Bhuyan,J. Biswal,A. Bobrov,A. Bondar,G. Bonvicini,A. Bozek,M. Bracko,F. Breibeck,T. E. Browder,D. Cervenkov,M. -C. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,K. Cho,Y. Choi,D. Cinabro,S. Di Carlo,Z. Dolezal,Z. Drasal,D. Dutta,S. Eidelman,D. Epifanov,H. Farhat,J. E. Fast,T. Ferber,B. G. Fulsom,V. Gaur,N. Gabyshev, |
| 概要 | 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 $\mathcal{B} (D^{0}\rightarrow K_{S}^{0}K_{S}^{0})$ = (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 ($D^0 \to K_S^0 \pi^0$). These results are significantly more precise than previous measurements available for this mode. The $A_{CP}$ measurement is consistent with the standard model expectation. |
| DOI | 10.1103/PhysRevLett.119.171801 |
| PermalinkURL | http://arxiv.org/abs/1705.05966v2 |
| researchmap用URL | http://arxiv.org/pdf/1705.05966v2 |