{"paper":{"title":"Measurement of time-dependent $CP$ violation in $B^0 \\to K^0_S \\pi^0 \\pi^0$ decays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Bozek, A. Chen, A. Giri, A. Ishikawa, A. J. Schwartz, A. M. Bakich, A. Rostomyan, A. Vossen, B. Bhuyan, Belle Collaboration: Y. Yusa, B. G. Cheon, B. G. Fulsom, B. Golob, B. Pal, B. Wang, C. H. Wang, C. P. Shen, C. Schwanda, C. Van Hulse, D. Cinabro, D. Epifanov, D. Kotchetkov, D. Liventsev, D. M. Asner, D. \\v{C}ervenkov, D. Y. Kim, E. Nakano, E. Prencipe, E. Waheed, E. Won, F. Tenchini, G. B. Mohanty, G. Inguglia, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. Hayashii, H. K. Moon, H. Miyata, H. Ono, H. Park, H. Ye, I. Badhrees, I. S. Lee, J. Biswal, J. B. Kim, J. E. Fast, J.-G. Shiu, J. Haba, J. H. Yin, J. Libby, J. S. Lange, K. Chilikin, K. E. Varvell, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. K. Joo, K. Miyabayashi, K. Nishimura, K. Ogawa, K. Senyo, K. Tanida, K. T. Kim, L. Cao, L. E. Piilonen, L. K. Li, L. Li Gioi, M. Bra\\v{c}ko, M. E. Sevior, M. Iwasaki, M. Lubej, M. Masuda, M. Merola, M. Stari\\v{c}, M. Sumihama, M. Takizawa, M. Uchida, M.-Z. Wang, N. Dash, N. K. Nisar, O. Schneider, O. Seon, P. Behera, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Wang, R. Ayad, R. Garg, R. Kroeger, R. Kumar, R. Mizuk, R. Pestotnik, R. van Tonder, S. Al Said, S. Bahinipati, S. C. Lee, S. Cunliffe, S. Di Carlo, S. Eidelman, S. Hirose, S. H. Kim, S. Jia, S.-K. Choi, S. Korpar, S. Nishida, S. Ogawa, S. Pardi, S. Paul, S. Sandilya, S. Uno, T.-A. Shibata, T. Aushev, T. E. Browder, T. Kawasaki, T. K. Pedlar, T. Kuhr, T. Luo, T. Matsuda, T. Nanut, T. Sanuki, T. Sumiyoshi, T. Uglov, T. V. Dong, U. Tamponi, V. Aulchenko, V. Babu, V. Bansal, V. Bhardwaj, V. Chekelian, V. Gaur, V. Popov, V. Savinov, V. Vorobyev, V. Zhilich, V. Zhulanov, W. W. Jacobs, Y. B. Li, Y. Choi, Y. Guan, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Sakai, Y. Seino, Y. Unno, Y. Ushiroda, Y. Usov, Z. Dr\\'asal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2018-10-08T09:11:11Z","abstract_excerpt":"We report a measurement of time-dependent $CP$ violation in $B^0 \\to K^0_S \\pi^0 \\pi^0$ decays using a data sample of $772 \\times 10^6$ $B\\bar{B}$ pairs collected by the Belle experiment runnin g at the $\\Upsilon (4S)$ resonance at the KEKB $e^+ e^-$ collider. This decay proceeds mainly via a $b\\to sd\\bar{d}$ \"penguin\" amplitude. The results are $\\sin 2\\phi^{\\rm eff}_1 = 0.92^{+0.27}_{-0.31}~$ (stat.) $\\pm 0.11$ (syst.) and $\\mathcal{A} = 0.28 \\pm 0.21$ (stat.) $\\pm 0.04$ (syst.), which are the most precise measurements of $CP$ violati on in this decay mode to date. The value for the $CP$-viol"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.03336","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"}