{"paper":{"title":"Observation of $\\Upsilon(4S)\\to \\eta' \\Upsilon(1S)$","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. Garmash, A. Giri, A. Ishikawa, A. Kuzmin, A. M. Bakich, A. Rostomyan, A. Sokolov, A. Vinokurova, Belle Collaboration: E. Guido, B. G. Cheon, B. G. Fulsom, B. Pal, B. Shwartz, B. Wang, C. H. Wang, C. Kiesling, C. P. Shen, C. Schwanda, C. Van Hulse, C. W. Park, C. Z. Yuan, D. Cinabro, D. Epifanov, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. \\v{C}ervenkov, D. Y. Kim, E. Nakano, E. Widmann, E. Won, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. B. Jeon, H. Hayashii, H. K. Moon, H. Miyata, H. Ono, H. Ye, I. Badhrees, I. S. Lee, J. Biswal, J. B. Kim, J. E. Fast, J. F. Strube, J.-G. Shiu, J. Haba, J. Libby, J. MacNaughton, J. Yelton, K. Chilikin, K. Cho, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. Miyabayashi, K. Tanida, K. T. Kim, L. E. Piilonen, L. K. Li, L. Li Gioi, M. Berger, M. Bra\\v{c}ko, M. Gelb, M. Iwasaki, M. Lubej, M. Masuda, M. Merola, M. Nakao, M. Nayak, M. Niiyama, M. Salehi, M. Stari\\v{c}, M. Sumihama, M. Takizawa, M. T. Hedges, M. Uchida, M. Watanabe, M.-Z. Wang, N. Gabyshev, O. Schneider, P. Behera, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Wang, R. Ayad, R. Garg, R. Itoh, R. Kroeger, R. Kulasiri, R. Kumar, R. Mizuk, R. Mussa, R. Pestotnik, S. Al Said, S. Choudhury, S. C. Lee, S. Cunliffe, S. Di Carlo, S. Eidelman, S. H. Kim, S. Jia, S.-K. Choi, S. Korpar, S. Nishida, S. Ogawa, S. Pardi, S. Paul, S. Zakharov, T.-A. Shibata, T. Aushev, T. E. Browder, T. Ferber, T. Hara, T. Julius, T. Kawasaki, T. K. Pedlar, T. Kumita, T. Luo, T. Matsuda, T. Mori, T. Nanut, T. Sanuki, T. Sumiyoshi, T. Uglov, U. Tamponi, V. Aulchenko, V. Babu, V. Bansal, V. Bhardwaj, V. Chekelian, V. Gaur, V. Popov, V. Shebalin, V. Zhilich, V. Zhukova, V. Zhulanov, W. Ostrowicz, W.-S. Hou, W. W. Jacobs, X. L. Wang, Y. B. Li, Y. Choi, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Sakai, Y. Seino, Y. Unno, Y. Usov, Y. Watanabe, Y. Yusa, Z. Dole\\v{z}al, Z. P. Zhang","submitted_at":"2018-03-27T20:23:45Z","abstract_excerpt":"We report the first observation of the hadronic transition $\\Upsilon(4S)\\to\\eta'\\Upsilon(1S)$, using 496 fb$^{-1}$ data collected at the $\\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We reconstruct the $\\eta'$ meson through its decays to $\\rho^0\\gamma$ and to $\\pi^+\\pi^-\\eta$, with $\\eta\\to\\gamma\\gamma$. We measure: ${\\cal B}(\\Upsilon(4S)\\to\\eta'\\Upsilon(1S))=(3.43\\pm 0.88 {\\rm(stat.)} \\pm 0.21 {\\rm(syst.)})\\times10^{-5}$, with a significance of 5.7$\\sigma$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10303","kind":"arxiv","version":1},"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"}