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Measurement of γγ *→π0 transition form factor at Belle

  • S. Uehara
  • , Y. Watanabe
  • , H. Nakazawa
  • , I. Adachi
  • , H. Aihara
  • , D. M. Asner
  • , T. Aushev
  • , A. M. Bakich
  • , K. Belous
  • , V. Bhardwaj
  • , B. Bhuyan
  • , M. Bischofberger
  • , A. Bondar
  • , G. Bonvicini
  • , A. Bozek
  • , M. Bračko
  • , T. E. Browder
  • , M. C. Chang
  • , A. Chen
  • , P. Chen
  • B. G. Cheon, K. Chilikin, I. S. Cho, K. Cho, Y. Choi, J. Dalseno, Z. Doleal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, M. Feindt, V. Gaur, N. Gabyshev, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, B. R. Ko, S. Koblitz, P. Kody, S. Korpar, R. T. Kouzes, P. Krian, P. Krokovny, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, J. Li, Y. Li, J. Libby, C. L. Lim, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, K. Miyabayashi, H. Miyata, Y. Miyazaki, G. B. Mohanty, A. Moll, T. Mori, N. Muramatsu, Y. Nagasaka, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, H. K. Park, K. S. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, K. Prothmann, M. Röhrken, S. Ryu, H. Sahoo, K. Sakai, Y. Sakai, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, C. Schwanda, R. Seidl, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, T. Sumiyoshi, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, Y. Unno, S. Uno, Y. Usov, P. Vanhoefer, G. Varner, A. Vinokurova, V. Vorobyev, C. H. Wang, P. Wang, M. Watanabe, K. M. Williams, E. Won, Y. Yamashita, C. Z. Yuan, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc
  • High Energy Accelerator Research Organization, Tsukuba
  • Kanagawa University
  • National Central University
  • The University of Tokyo
  • Pacific Northwest National Laboratory
  • Alikhanov Institute for Theoretical and Experimental Physics
  • The University of Sydney
  • Institute for High Energy Physics
  • Nara Women's University
  • Indian Institute of Technology Guwahati
  • Novosibirsk State University
  • Wayne State University
  • H. Niewodniczanski Institute of Nuclear Physics
  • Jožef Stefan Institute
  • University of Maribor
  • University of Hawai'i at Mānoa
  • Fu Jen Catholic University
  • National Taiwan University
  • Hanyang University
  • Yonsei University
  • Korea Institute of Science and Technology Information
  • Sungkyunkwan University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • Technische Universität München
  • Charles University
  • Karlsruhe Institute of Technology
  • Tata Institute of Fundamental Research
  • University of Ljubljana
  • Nagoya University
  • Tohoku Gakuin University
  • Kyungpook National University
  • Tohoku University
  • University of Melbourne
  • Niigata University
  • Korea University
  • Justus Liebig University Giessen
  • Seoul National University
  • Virginia Polytechnic Institute and State University
  • Indian Institute of Technology Madras
  • University of Science and Technology of China
  • University of Cincinnati
  • CAS - Institute of High Energy Physics
  • Swiss Federal Institute of Technology Lausanne
  • The University of Osaka
  • Hiroshima Institute of Technology
  • Osaka Metropolitan University
  • Tokyo University of Agriculture and Technology
  • Toho University
  • Luther College, Decorah
  • University of Pittsburgh
  • Austrian Academy of Sciences
  • Riken BNL Research Center
  • Yamagata University
  • Institute of Science Tokyo
  • Panjab University
  • Tokyo Metropolitan University
  • National United University Taiwan
  • Nippon Dental University

Research output: Contribution to journalArticlepeer-review

244 Scopus citations

Abstract

We report a measurement of the process γγ *→π0 with a 759fb -1 data sample recorded with the Belle detector at the KEKB asymmetric-energy e +e - collider. The pion transition form factor, F(Q2), is measured for the kinematical region 4GeV2Q240GeV2, where -Q2 is the invariant-mass squared of a virtual photon. The measured values of Q2|F(Q2)| agree well with the previous measurements below Q29GeV2 but do not exhibit the rapid growth in the higher Q2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%.

Original languageEnglish
Article number092007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number9
DOIs
StatePublished - 9 Nov 2012

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