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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
- 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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