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arXiv · 1705.05966

Search for $CP$ Violation and Measurement of the Branching Fraction in the Decay $D^{0} \to K^0_S K^0_S$

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·A. Garmash·R. Gillard·P. Goldenzweig·J. Haba·T. Hara·K. Hayasaka·H. Hayashii·M. T. Hedges·W. -S. Hou·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·I. Jaegle·H. B. Jeon·Y. Jin·D. Joffe·K. K. Joo·T. Julius·J. Kahn·A. B. Kaliyar·G. Karyan·P. Katrenko·T. Kawasaki·C. Kiesling·D. Y. Kim·H. J. Kim·J. B. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·P. Kodys·S. Korpar·D. Kotchetkov·P. Krizan·P. Krokovny·T. Kuhr·R. Kulasiri·R. Kumar·T. Kumita·A. Kuzmin·Y. -J. Kwon·J. S. Lange I. S. Lee·C. H. Li·L. Li·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·M. Lubej
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Abstract

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 $Υ(4S)$ and $Υ(5S)$ 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 ($D^0 \to K_S^0 π^0$). 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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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, A. Garmash, R. Gillard, P. Goldenzweig, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, W. -S. Hou, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, Y. Jin, D. Joffe, K. K. Joo, T. Julius, J. Kahn, A. B. Kaliyar, G. Karyan, P. Katrenko, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodys, S. Korpar, D. Kotchetkov, P. Krizan, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, J. S. Lange I. S. Lee, C. H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej. 2017-10-10. Search for $CP$ Violation and Measurement of the Branching Fraction in the Decay $D^{0} \to K^0_S K^0_S$. https://doi.org/10.1103/physrevlett.119.171801

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