First observation of CP violation and improved measurement of the branching fraction and polarization of B0→D*+ D*- decays

B. Kronenbitter, I. Adachi, H. Aihara, K. Arinstein, D. M. Asner, T. Aushev, T. Aziz, A. M. Bakich, M. Barrett, K. Belous, V. Bhardwaj, B. Bhuyan, A. Bondar, A. Bozek, M. Bračko, O. Brovchenko, T. E. Browder, V. Chekelian, A. Chen, P. ChenB. G. Cheon, R. Chistov, I. S. Cho, K. Cho, Y. Choi, J. Dalseno, Z. Doležal, Z. Drásal, A. Drutskoy, S. Eidelman, S. Esen, J. E. Fast, M. Feindt, V. Gaur, N. Gabyshev, Y. M. Goh, J. Haba, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Julius, J. H. Kang, P. Kapusta, T. Kawasaki, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Koblitz, P. Kodyš, S. Korpar, R. T. Kouzes, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, Y. J. Kwon, S. H. Lee, J. Li, Y. Li, J. Libby, Y. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, S. McOnie, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, D. Mohapatra, A. Moll, E. Nakano, M. Nakao, S. Neubauer, C. Ng, S. Nishida, K. Nishimura, O. Nitoh, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, H. K. Park, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Prim, M. Ritter, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, A. Sibidanov, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, K. Sumisawa, T. Sumiyoshi, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Usov, P. Vanhoefer, G. Varner, K. E. Varvell, V. Vorobyev, C. H. Wang, P. Wang, Y. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, J. Yamaoka, Y. Yamashita, D. Zander, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We report the measurement of the branching fraction, the polarization, and the parameters of the time-dependent CP violation in B0→D* +D* - decays using a data sample of 772×106BB̄ pairs, collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. We obtain a branching fraction of B=(7.82±0.38±0.63) ×10 -4, a CP-odd fraction of R =0.138±0. 024±0.006 and, additionally, a fraction of the longitudinal component in the transversity base of R 0=0.624±0.029±0.011. The measured values of the parameters of the CP violation are SD* +D* -=-0.79±0.13±0.03 and AD* +D* -=0.15±0.08±0.04.

Original languageEnglish
Article number071103
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number7
DOIs
Publication statusPublished - 2012 Oct 18

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Kronenbitter, B., Adachi, I., Aihara, H., Arinstein, K., Asner, D. M., Aushev, T., Aziz, T., Bakich, A. M., Barrett, M., Belous, K., Bhardwaj, V., Bhuyan, B., Bondar, A., Bozek, A., Bračko, M., Brovchenko, O., Browder, T. E., Chekelian, V., Chen, A., ... Zupanc, A. (2012). First observation of CP violation and improved measurement of the branching fraction and polarization of B0→D*+ D*- decays. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(7), [071103]. https://doi.org/10.1103/PhysRevD.86.071103