{"paper":{"title":"Measurement of gamma gamma* --> pi0 transition form factor at Belle","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. Ishikawa, A. Kuzmin, A. M. Bakich, A. Moll, A. Sibidanov, A. Sokolov, A. Vinokurova, A. Zupanc, B. Bhuyan, B. G. Cheon, B. Golob, B. R. Ko, B. Shwartz, C. C. Zhang, C. H. Wang, C. Kiesling, C. Liu, C.-L. Lim, C. P. Shen, C. Schwanda, C. Z. Yuan, D. Epifanov, D. Liventsev, D. M. Asner, D. Matvienko, E. Nakano, E. Solovieva, E. Won, F. Simon, G. B. Mohanty, G. Bonvicini, G. Pakhlova, G. Varner, H. Aihara, H. Hayashii, H. J. Hyun, H. J. Kim, H. K. Park, H. Miyata, H. Nakazawa, H. O. Kim, H. Sahoo, I. Adachi, I.-S. Cho, J. B. Kim, J. B. Singh, J. Dalseno, J. E. Fast, J.-G. Shiu, J. Haba, J. H. Kang, J. H. Kim, J. Li, J. Libby, J. S. Lange, K. Belous, K. Chilikin, K. Cho, K. Hayasaka, K. Miyabayashi, K. M. Williams, K. Nishimura, K. Prothmann, K. Sakai, K. Senyo, K. S. Park, K. T. Kim, K. Trabelsi, L. E. Piilonen, M. Bischofberger, M. Bracko, M.-C. Chang, M. E. Sevior, M. Feindt, M. Iwabuchi, M. J. Kim, M. Nakao, M. Petric, M. Rohrken, M. Shapkin, M. Staric, M. Uchida, M. Watanabe, N. Gabyshev, N. Muramatsu, O. Nitoh, O. Schneider, O. Seon, P. Chen, P. Kodys, P. Krizan, P. Krokovny, P. Pakhlov, P. Smerkol, P. Vanhoefer, P. Wang, R. Itoh, R. Louvot, R. Pestotnik, R. Seidl, R. T. Kouzes, S. Eidelman, S.-H. Lee, S. Koblitz, S. Korpar, S. L. Olsen, S. Nishida, S. Ogawa, S. Okuno, S. Ryu, S. Uno, T.-A. Shibata, T. Aushev, T. E. Browder, The Belle Collaboration: S. Uehara, T. Iijima, T. Iwashita, T. Julius, T. Kawasaki, T. K. Pedlar, T. Mori, T. Ohshima, T. Sanuki, T. Sumiyoshi, T. Tsuboyama, V. Bhardwaj, V. Gaur, V. Savinov, V. Vorobyev, V. Zhilich, V. Zhulanov, W.-S. Hou, Y. Choi, Y. Horii, Y. Hoshi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Li, Y. Liu, Y. M. Goh, Y. Miyazaki, Y. Nagasaka, Y. Onuki, Y. Sakai, Y. Sato, Y.-S. Sohn, Y. Teramoto, Y. Unno, Y. Usov, Y. Watanabe, Y. Yamashita, Z. Dolezal, Z. Drasal, Z. Natkaniec, Z. P. Zhang, Z. Q. Liu","submitted_at":"2012-05-15T03:40:42Z","abstract_excerpt":"We report a measurement of the process gamma gamma* --> pi0 with a 759 fb^{-1} data sample recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. The pion transition form factor, F(Q^2), is measured for the kinematical region 4 GeV^2 <~ Q^2 <~ 40 GeV^2, where -Q^2 is the invariant mass squared of a virtual photon. The measured values of Q^2|F(Q^2)| agree well with the previous measurements below Q^2 ~= 9 GeV^2 but do not exhibit the rapid growth in the higher Q^2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1205.3249","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"}