{"paper":{"title":"First observation of CP violation and improved measurement of the branching fraction and polarization of B0 -> D*+ D*- decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Bondar, A. Bozek, A. Chen, A. Drutskoy, A. Ishikawa, A. J. Schwartz, A. M. Bakich, A. Moll, A. Sibidanov, A. Sokolov, A. Zupanc, B. Bhuyan, B. D. Yabsley, Belle Collaboration: B. Kronenbitter, B. G. Cheon, B. R. Ko, C. H. Wang, C. Kiesling, C. Ng, C. P. Shen, C. Schwanda, C. W. Park, D. Liventsev, D. M. Asner, D. Mohapatra, D. Zander, E. Nakano, E. Solovieva, E. Won, F. Simon, G. B. Mohanty, G. Pakhlova, G. Tatishvili, G. Varner, H. Aihara, H. Hayashii, H. J. Kim, H. K. Park, H. Miyata, H. O. Kim, H. Ozaki, H. Park, H. Sahoo, I. Adachi, I.-S. Cho, J. B. Kim, J. Dalseno, J. E. Fast, J.-G. Shiu, J. Haba, J. H. Kang, J. H. Kim, J. Li, J. Libby, J. Yamaoka, K. Arinstein, K. Belous, K. Cho, K. E. Varvell, K. Inami, K. Kinoshita, K. Miyabayashi, K. M. Williams, K. Nishimura, K. Senyo, K. Sumisawa, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Santelj, M. Barrett, M. Bra\\v{c}ko, M. E. Sevior, M. Feindt, M. Iwabuchi, M. J. Kim, M. Nakao, M. Petri\\v{c}, M. Prim, M. Ritter, M. R\\\"ohrken, M. Shapkin, M. Stari\\v{c}, M. Sumihama, M. Uchida, N. Gabyshev, O. Brovchenko, O. Nitoh, O. Schneider, P. Chen, P. Kapusta, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Smerkol, P. Vanhoefer, P. Wang, R. Chistov, R. Itoh, R. Kumar, R. Louvot, R. Mizuk, R. Pestotnik, R. T. Kouzes, S. Eidelman, S. Esen, S.-H. Lee, S. Koblitz, S. Korpar, S. L. Olsen, S. McOnie, S. Neubauer, S. Nishida, S. Okuno, S. Ryu, S. Sandilya, S. Stani\\v{c}, S. Uehara, S. Uno, T.-A. Shibata, T. Aushev, T. Aziz, T. E. Browder, T. Iijima, T. Julius, T. Kawasaki, T. Kuhr, T. Kumita, T. Ohshima, T. Sanuki, T. Sumiyoshi, T. Tsuboyama, T. Uglov, V. Bhardwaj, V. Chekelian, V. Gaur, V. Vorobyev, V. Zhilich, V. Zhulanov, W.-S. Hou, Y. B. Hsiung, Y. Choi, Y. Horii, Y. Hoshi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Li, Y. Liu, Y. M. Goh, Y. Onuki, Y. Sakai, Y.-S. Sohn, Y. Teramoto, Y. Unno, Y. Usov, Y. Watanabe, Y. Yamashita, Z. Dole\\v{z}al, Z. Dr\\'asal, Z. Q. Liu","submitted_at":"2012-07-24T08:07:51Z","abstract_excerpt":"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 million BB pairs, collected at the Y(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) x10^{-4}, a CP-odd fraction of R_\\perp = 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 a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.5611","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}