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arXiv · 1607.05813

Measurement of the CKM angle $\varphi_1$ in $B^0\to\bar{D}{}^{(*)0}h^0$, $\bar{D}{}^0\to K_S^0\pi^+\pi^-$ decays with time-dependent binned Dalitz plot analysis

Belle Collaboration·V. Vorobyev·I. Adachi·H. Aihara·D. M. Asner·T. Aushev·R. Ayad·I. Badhrees·S. Bahinipati·A. M. Bakich·P. Behera·V. Bhardwaj·B. Bhuyan·J. Biswal·A. Bobrov·A. Bondar·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·R. Chistov·K. Cho·V. Chobanova·Y. Choi·D. Cinabro·M. Danilov·N. Dash·S. Di Carlo·Z. Doležal·Z. Drásal·A. Drutskoy·D. Dutta·S. Eidelman·D. Epifanov·H. Farhat·J. E. Fast·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·P. Goldenzweig·D. Greenwald·J. Haba·K. Hayasaka·H. Hayashii·W. -S. Hou·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·I. Jaegle·D. Joffe·K. K. Joo·T. Julius·K. H. Kang·C. Kiesling·D. Y. Kim·H. J. Kim·J. B. Kim·K. T. Kim·S. H. Kim·K. Kinoshita·P. Kodyš·D. Kotchetkov·P. Križan·P. Krokovny·R. Kumar·T. Kumita·Y. -J. Kwon·J. S. Lange·C. H. Li·H. Li·L. Li·Y. Li·J. Libby·D. Liventsev·M. Lubej·M. Masuda·T. Matsuda·D. Matvienko·K. Miyabayashi·H. Miyata·R. Mizuk·G. B. Mohanty·A. Moll·H. K. Moon·R. Mussa·M. Nakao·T. Nanut·K. J. Nath·M. Nayak·K. Negishi·S. Nishida
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Abstract

We report a measurement of the CP violation parameter $\varphi_1$ obtained in a time-dependent analysis of $B^0\to\bar{D}{}^{(*)0}h^0$ decays followed by $\bar{D}{}^0\to K_S^0\pi^+\pi^-$ decay. A model-independent measurement is performed using the binned Dalitz plot technique. The measured value is $\varphi_1 = 11.7^{\circ}\pm7.8^{\circ}({\rm stat.})\pm 2.1^{\circ}({\rm syst.})$. Treating $\sin{2\varphi_1}$ and $\cos{2\varphi_1}$ as independent parameters, we obtain $\sin{2\varphi_1} = 0.43\pm 0.27({\rm stat.})\pm 0.08({\rm syst.})$ and $\cos{2\varphi_1} = 1.06\pm 0.33({\rm stat.})^{+0.21}_{-0.15}({\rm syst.})$. The results are obtained with a full data sample of $772 \times 10^6 B\bar{B}$ pairs collected near the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.

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Belle Collaboration, V. Vorobyev, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, I. Badhrees, S. Bahinipati, A. M. Bakich, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, M. Danilov, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, D. Greenwald, J. Haba, K. Hayasaka, H. Hayashii, W. -S. Hou, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, D. Kotchetkov, P. Križan, P. Krokovny, R. Kumar, T. Kumita, Y. -J. Kwon, J. S. Lange, C. H. Li, H. Li, L. Li, Y. Li, J. Libby, D. Liventsev, M. Lubej, M. Masuda, T. Matsuda, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, H. K. Moon, R. Mussa, M. Nakao, T. Nanut, K. J. Nath, M. Nayak, K. Negishi, S. Nishida. 2016-07-20. Measurement of the CKM angle $\varphi_1$ in $B^0\to\bar{D}{}^{(*)0}h^0$, $\bar{D}{}^0\to K_S^0\pi^+\pi^-$ decays with time-dependent binned Dalitz plot analysis. https://doi.org/10.1103/physrevd.94.052004

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