Measurement of the CP violation parameters in B0→π+π- decays

J. Dalseno, K. Prothmann, C. Kiesling, I. Adachi, H. Aihara, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, A. Bay, P. Behera, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. BrowderV. Chekelian, A. Chen, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, S. K. Choi, Y. Choi, D. Cinabro, M. Danilov, Z. Doležal, Z. Drásal, A. Drutskoy, D. Dutta, K. Dutta, S. Eidelman, H. Farhat, J. E. Fast, M. Feindt, T. Ferber, A. Frey, V. Gaur, S. Ganguly, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, T. Higuchi, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Julius, D. H. Kah, E. Kato, H. Kawai, T. Kawasaki, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, B. Kronenbitter, A. Kuzmin, Y. J. Kwon, S. H. Lee, J. Li, Y. Li, L. Li Gioi, J. Libby, C. Liu, D. Liventsev, P. Lukin, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, T. Mori, H. G. Moser, N. Muramatsu, R. Mussa, Y. Nagasaka, M. Nakao, M. Nayak, E. Nedelkovska, C. Ng, C. Niebuhr, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, S. Okuno, S. L. Olsen, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, S. Ryu, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, D. Semmler, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. S. Sohn, E. Solovieva, S. Stanič, M. Starič, M. Steder, M. Sumihama, K. Sumisawa, T. Sumiyoshi, U. Tamponi, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, V. Vorobyev, M. N. Wagner, C. H. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, Eunil Won, B. D. Yabsley, H. Yamamoto, Y. Yamashita, S. Yashchenko, Y. Yook, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We present a measurement of the charge-parity (CP) violating parameters in B0→π+π- decays. The results are obtained from the final data sample containing 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain the CP violation parameters ACP(B0→π+π-)=+0.33±0.06(stat)±0.03(syst),SCP(B0→π+π-)=-0.64±0.08(stat)±0.03(syst),where ACP and SCP represent the direct and mixing-induced CP asymmetries in B0→π+π- decays, respectively. Using an isospin analysis including results from other Belle measurements, we find 23.8 <φ2<66.8 is disfavored at the 1σ level, where φ2 is one of the three interior angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle related to Bu,d decays.

Original languageEnglish
Article number092003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number9
DOIs
Publication statusPublished - 2013 Nov 19

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Dalseno, J., Prothmann, K., Kiesling, C., Adachi, I., Aihara, H., Arinstein, K., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bala, A., Bay, A., Behera, P., Bhardwaj, V., Bhuyan, B., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., ... Zupanc, A. (2013). Measurement of the CP violation parameters in B0→π+π- decays. Physical Review D - Particles, Fields, Gravitation and Cosmology, 88(9), [092003]. https://doi.org/10.1103/PhysRevD.88.092003