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Asner, D. Matvienko, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Guido, E. Solovieva, E. Widmann, E. Won, F. Tenchini, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. B. Jeon, H. Hayashii, H. J. Kim, H. Kichimi, H. K. Moon, H. Miyata, H. Ono, H. Park, H. Ye, I. Adachi, I. Badhrees, I. Jaegle, I. S. Lee, J. Biswal, J. B. Kim, J. E. Fast, J. F. Strube, J.-G. Shiu, J. Haba, J. Libby, K. Chilikin, K. Cho, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. K. Joo, K. Miyabayashi, K. Senyo, K. Tanida, L. E. Piilonen, L. K. Li, L. Li Gioi, M. Berger, M. Bra\\v{c}ko, M. E. Sevior, M. Gelb, M. Iwasaki, M. Lubej, M. Masuda, M. Merola, M. Nayak, M. Ritter, M. Salehi, M. Stari\\v{c}, M. Takizawa, M. T. Hedges, M. Uchida, M. Watanabe, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, N. Shimizu, O. Schneider, O. Seon, P. Behera, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Urquijo, P. Wang, R. Ayad, R. Garg, R. Itoh, R. Kroeger, R. Kulasiri, R. Mizuk, R. Mussa, R. Pestotnik, S. Al Said, S. C. Lee, S. Cunliffe, S. Di Carlo, S. Eidelman, S.-K. Choi, S. Korpar, S. Nishida, S. Okuno, S. Paul, S. Sandilya, S. Uehara, S. Uno, S. Zakharov, T.-A. Shibata, T. Aushev, T. Czank, T. Ferber, The Belle Collaboration: Q. N. Xu, T. Julius, T. Kawasaki, T. K. Pedlar, 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. Gaur, V. Popov, V. Savinov, V. Shebalin, V. Vorobyev, V. Zhilich, V. Zhukova, V. Zhulanov, W.-S. Hou, X. L. Wang, Y. Choi, Y. Guan, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Li, Y. Onuki, Y. Sakai, Y. Seino, Y. Unno, Y. Watanabe, Y. Yusa, Z. Dole\\v{z}al, Z. Dr\\'asal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2018-05-08T14:15:34Z","abstract_excerpt":"We report the measurement of gamma gamma to eta_c(1S), eta_c(2S) to eta' pi+ pi- with eta' decays to gamma rho and eta pi+ pi- using 941 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The eta_c(1S) mass and width are measured to be M = [2984.6\\pm0.7 (stat.)\\pm2.2 (syst.)] MeV/c^{2} and \\Gamma = [30.8^{+2.3}_{-2.2}~(stat.) \\pm 2.5~(syst.)] MeV, respectively. First observation of eta_c(2S) to eta' pi+ pi- with a significance of 5.5sigma including systematic error is obtained, and the eta_c(2S) mass is measured to be M = [3635.1\\pm3.7~(stat.)\\pm2.9~"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1805.03044","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2018-05-08T14:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"6b4ca4bc24ac4eda44cb66ceb09e169f00c93fa5d8a8b57ed7f039eca7643e0c","abstract_canon_sha256":"d9180e23a7e802ba85a40e7526f2afbad904acc3f49401f1f7e29b0208aa1b3d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:17.914116Z","signature_b64":"RguQ3l64y2lyWmfsb5RJcTpb599H15IRcBqpgmqEbe2WvlO/c1lgx+32QxcBmOBJRVemyApJr4fvm/WCFkTYAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc54b23038a18e01fa02efcf2236f821cdbd69016c9eca7f2b06b0104c24a4c0","last_reissued_at":"2026-05-18T00:02:17.913403Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:17.913403Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Measurement of eta_c(1S), eta_c(2S) and non-resonant eta' pi+ pi- production via two-photon collisions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. B. Kaliyar, A. Bondar, A. Bozek, A. Chen, A. Garmash, A. Ishikawa, A. M. Bakich, A. Rostomyan, A. Sokolov, A. Vinokurova, A. Vossen, A. Zupanc, B. Bhuyan, B. G. Cheon, B. G. Fulsom, B. Pal, B. Wang, C. C. Zhang, C. H. Wang, C. Kiesling, C. P. Shen, C. Schwanda, C. Van Hulse, C. Z. Yuan, D. Cinabro, D. Epifanov, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Guido, E. Solovieva, E. Widmann, E. Won, F. Tenchini, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. B. Jeon, H. Hayashii, H. J. Kim, H. Kichimi, H. K. Moon, H. Miyata, H. Ono, H. Park, H. Ye, I. Adachi, I. Badhrees, I. Jaegle, I. S. Lee, J. Biswal, J. B. Kim, J. E. Fast, J. F. Strube, J.-G. Shiu, J. Haba, J. Libby, K. Chilikin, K. Cho, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. K. Joo, K. Miyabayashi, K. Senyo, K. Tanida, L. E. Piilonen, L. K. Li, L. Li Gioi, M. Berger, M. Bra\\v{c}ko, M. E. Sevior, M. Gelb, M. Iwasaki, M. Lubej, M. Masuda, M. Merola, M. Nayak, M. Ritter, M. Salehi, M. Stari\\v{c}, M. Takizawa, M. T. Hedges, M. Uchida, M. Watanabe, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, N. Shimizu, O. Schneider, O. Seon, P. Behera, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Urquijo, P. Wang, R. Ayad, R. Garg, R. Itoh, R. Kroeger, R. Kulasiri, R. Mizuk, R. Mussa, R. Pestotnik, S. Al Said, S. C. Lee, S. Cunliffe, S. Di Carlo, S. Eidelman, S.-K. Choi, S. Korpar, S. Nishida, S. Okuno, S. Paul, S. Sandilya, S. Uehara, S. Uno, S. Zakharov, T.-A. Shibata, T. Aushev, T. Czank, T. Ferber, The Belle Collaboration: Q. N. Xu, T. Julius, T. Kawasaki, T. K. Pedlar, 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. Gaur, V. Popov, V. Savinov, V. Shebalin, V. Vorobyev, V. Zhilich, V. Zhukova, V. Zhulanov, W.-S. Hou, X. L. Wang, Y. Choi, Y. Guan, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. 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