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High-statistics measurement of neutral-pion pair production in two-photon collisions

Authors
Uehara, S.Watanabe, Y.Adachi, I.Aihara, H.Arinstein, K.Bakich, A. M.Balagura, V.Barberio, E.Bay, A.Bedny, I.Belous, K.Bhardwaj, V.Bitenc, U.Bondar, A.Bracko, M.Browder, T. E.Chang, M. -C.Chen, A.Chen, K. -F.Chen, W. T.Cheon, B. G.Cho, I. -S.Choi, Y.Dalseno, J.Dash, M.Drutskoy, A.Eidelman, S.Epifanov, D.Golob, B.Ha, H.Haba, J.Hayasaka, K.Hayashii, H.Hoshi, Y.Hou, W. -S.Hyun, H. J.Iijima, T.Inami, K.Ishikawa, A.Itoh, R.Iwasaki, M.Iwasaki, Y.Kah, D. H.Kaji, H.Kang, J. H.Katayama, N.Kawai, H.Kawasaki, T.Kichimi, H.Kim, H. J.Kim, Y. I.Kim, Y. J.Korpar, S.Krizan, P.Krokovny, P.Kumar, R.Kuzmin, A.Kwon, Y. -J.Kyeong, S. -H.Lange, J. S.Lee, J. S.Lee, S. E.Limosani, A.Lin, S. -W.Liu, C.Liu, Y.Liventsev, D.Mandl, F.McOnie, S.Miyabayashi, K.Miyazaki, Y.Mori, T.Nagasaka, Y.Nakamura, I.Nakano, E.Nakao, M.Nakazawa, H.Natkaniec, Z.Nishida, S.Nitoh, O.Ogawa, S.Ohshima, T.Okuno, S.Olsen, S. L.Ozaki, H.Pakhlov, P.Pakhlova, G.Palka, H.Park, C. W.Park, H.Park, H. K.Park, K. S.Peak, L. S.Piilonen, L. E.Sahoo, H.Sakai, Y.Schneider, O.Senyo, K.Sevior, M. E.Shapkin, M.Shen, C. P.Shiu, J. -G.Shwartz, B.Singh, J. B.Sokolov, A.Stanic, S.Staric, M.Sumiyoshi, T.Suzuki, S. Y.Taylor, G. N.Teramoto, Y.Tikhomirov, I.Uglov, T.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Varner, G.Wang, C. H.Wang, P.Wang, X. L.Wedd, R.Won, E.Yamashita, Y.Yusa, Y.Zhang, Z. P.Zhilich, V.Zhulanov, V.Zivko, T.Zupanc, A.Zyukova, O.
Issue Date
9월-2008
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.78, no.5
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW D
Volume
78
Number
5
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/122794
DOI
10.1103/PhysRevD.78.052004
ISSN
1550-7998
Abstract
We present a high-statistics measurement of differential cross sections and the total cross section for the process gamma gamma -> pi(0)pi(0) in the kinematic range 0.6 GeV <= W <= 4.0 GeV and vertical bar cos theta*vertical bar <= 0.8, where W and theta* are the energy and pion scattering angle, respectively, in the gamma gamma center-of-mass system. Differential cross sections are fitted to obtain information on S, D-0, D-2, G(0), and G(2) waves. The G waves are important above W similar or equal to 1.6 GeV. The general behavior of partial waves is studied by fitting differential cross sections in a simple parametrization where amplitudes contain resonant contributions and smooth background. The D-2 wave is dominated by the f(2)(1270) meson whose parameters are consistent with the current world averages. The D-0 wave contains a f(2)(1270) component, whose fraction is fitted. For the S wave, the f(0)(980) parameters are found to be consistent with the values determined from our recent pi(+) pi(-) data. In addition to the f(0)(980), the S wave prefers to have another resonance-like contribution whose parameters are obtained.
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