{"paper":{"title":"Study of B^0 -> rho^0 rho^0 decays, implications for the CKM angle phi_2 and search for other B^0 decay modes with a four-pion final state","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Bala, A. Bozek, A. Chen, A. Garmash, A. Ishikawa, A. J. Schwartz, A. Kuzmin, A. M. Bakich, A. Moll, A. Rostomyan, A. Sibidanov, A. Sokolov, A. Vinokurova, A. Zupanc, B. Bhuyan, B. G. Cheon, B. Golob, B. Kronenbitter, B. R. Ko, B. Shwartz, C. H. Wang, C. Kiesling, C. Liu, C. P. Shen, C. Schwanda, C. Van Hulse, C. W. Park, D. Cinabro, D. H. Kah, D. Liventsev, D. M. Asner, D. Semmler, D. Y. Kim, E. Kato, E. Nakano, E. Nedelkovska, E. Solovieva, E. Won, F. Simon, G. B. Mohanty, G. Bonvicini, G. Pakhlova, G. Schnell, G. Tatishvili, G. Varner, H. Aihara, H. Farhat, H.-G. Moser, H. Hayashii, H. J. Hyun, H. Kawai, H. K. Park, H. Miyata, H. O. Kim, H. Park, H. Sahoo, I. Adachi, I. Jaegle, J. B. Kim, J. Dalseno, J. E. Fast, J.-G. Shiu, J. H. Kim, J. Klucar, J. Li, J. Libby, J. S. Lange, K. Chilikin, K. Cho, K. E. Varvell, K. Hayasaka, K. Kinoshita, K. Miyabayashi, K. M. Williams, K. Senyo, K. Trabelsi, L. E. Piilonen, L. Li Gioi, L. Santelj, M. Bra\\c{c}ko, M.-C. Chang, M. E. Sevior, M. J. Kim, M. Nakao, M. N. Wagner, M. Petri\\c{c}, M. Ritter, M. R\\\"ohrken, M. Shapkin, M. Stari\\c{c}, M. Steder, M. Uchida, M.-Z. Wang, N. Gabyshev, N. K. Nisar, O. Nitoh, O. Schneider, O. Seon, P. Chang, P. Chen, P. Kri\\c{z}an, P. Krokovny, P. Lukin, P. Pakhlov, P. Wang, R. Chistov, R. Gillard, R. Itoh, R. Mizuk, R. Mussa, R. Pestotnik, S. Eidelman, S. E. Vahsen, S. Ganguly, S.-H. Lee, S. Korpar, S. Nishida, S. Ogawa, S. Ryu, S. Sandilya, S. Uehara, S. Uno, S. Yashchenko, T.-A. Shibata, T. Aushev, T. E. Browder, T. Ferber, T. Hara, The Belle Collaboration: P. Vanhoefer, T. Higuchi, T. Iijima, T. Iwashita, T. Julius, T. Kawasaki, T. K. Pedlar, T. Kuhr, T. Kumita, T. Saito, T. Sanuki, T. Sumiyoshi, T. Tsuboyama, U. Tamponi, V. Aulchenko, V. Bhardwaj, V. Chekelian, V. Chobanova, V. Gaur, V. Savinov, V. Vorobyev, V. Zhilich, V. Zhulanov, W.-S. Hou, X. L. Wang, Y. Choi, Y. Horii, Y. Hoshi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Liu, Y. M. Goh, Y. Sakai, Y. Sato, Y.-S. Sohn, Y. Teramoto, Y. Unno, Y. Watanabe, Y. Yamashita, Y. Yook, Z. Dole\\c{z}al, Z. Dra\\'sal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2012-12-17T15:01:25Z","abstract_excerpt":"We present a study of the branching fraction of the decay B^0->rho0rho0 and the fraction of longitudinally polarized rho0 mesons in this decay. The results are obtained from the final data sample containing 772 million BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166 +- 59 B^0 -> rho0 rho0 events (including systematic uncertainties), corresponding to a branching fraction of B(B^0->rho0rho0) = (1.02 +- 0.30 (stat) +- 0.15 (syst)) x 10^{-6} with a significance of 3.4 standard deviations and a longitudinal polarization f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.4015","kind":"arxiv","version":4},"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"}