Measurement of γγ <sup>*</sup>→π0 transition form factor at Belle

Date Issued
09-11-2012
Author(s)
Uehara, S.
Watanabe, Y.
Nakazawa, H.
Adachi, I.
Aihara, H.
Asner, D. M.
Aushev, T.
Bakich, A. M.
Belous, K.
Bhardwaj, V.
Bhuyan, B.
Bischofberger, M.
Bondar, A.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
Chang, M. C.
Chen, A.
Chen, P.
Cheon, B. G.
Chilikin, K.
Cho, I. S.
Cho, K.
Choi, Y.
Dalseno, J.
Doleal, Z.
Drásal, Z.
Eidelman, S.
Epifanov, D.
Fast, J. E.
Feindt, M.
Gaur, V.
Gabyshev, N.
Goh, Y. M.
Golob, B.
Haba, J.
Hayasaka, K.
Hayashii, H.
Horii, Y.
Hoshi, Y.
Hou, W. S.
Hyun, H. J.
Iijima, T.
Ishikawa, A.
Itoh, R.
Iwabuchi, M.
Iwasaki, Y.
Iwashita, T.
Julius, T.
Kang, J. H.
Kawasaki, T.
Kiesling, C.
Kim, H. J.
Kim, H. O.
Kim, J. B.
Kim, J. H.
Kim, K. T.
Kim, M. J.
Kim, Y. J.
Ko, B. R.
Koblitz, S.
Kody, P.
Korpar, S.
Kouzes, R. T.
Krian, P.
Krokovny, P.
Kuzmin, A.
Kwon, Y. J.
Lange, J. S.
Lee, S. H.
Li, J.
Li, Y.
Indian Institute of Technology, Madras
Lim, C. L.
Liu, C.
Liu, Y.
Liu, Z. Q.
Liventsev, D.
Louvot, R.
Matvienko, D.
Miyabayashi, K.
Miyata, H.
Miyazaki, Y.
Mohanty, G. B.
Moll, A.
Mori, T.
Muramatsu, N.
Nagasaka, Y.
Nakano, E.
Nakao, M.
Natkaniec, Z.
Nishida, S.
Nishimura, K.
Nitoh, O.
Ogawa, S.
Ohshima, T.
Okuno, S.
Olsen, S. L.
Onuki, Y.
DOI
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%. © 2012 American Physical Society.
Volume
86