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ISSN - 00319015, Journal of the Physical Society of Japan, 2007, vol. 76, p. -

High statistics measurement of the cross sections of γγ → π +π - production

Mori T., Uehara S., Watanabe Y., Abe K., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bračko M., Browder T. E., Chang M. C., Chen A., Chen W. T., Cheon B. G., Cho I. S., Choi S. K., Choi Y., Dalseno J., Dash M., Drutskoy A., Eidelman S., Fratina S., Gabyshev N., Golob B., Ha H., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kang J. H., Kapusta P., Katayama N., Kawasaki T., Kichimi H., Kim H. O., Kim S. K., Kim Y. J., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., MacNaughton J., Mandl F., Matsumoto T., Matyja A., Mconie S., Medvedeva T., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Ohshima T., Okuno S.

We report on a high statistics measurement of the total and differential cross sections of the process γγ → π +π - in the π +π - invariant mass range 0.8 GeV/c 2 < W < 1.5 GeV/c 2 with 85.9 fb -1 of data collected at √s = 10.58 GeV and 10.52 GeV with the Belle detector. A clear signal of the f 0(980) resonance is observed in addition to the f 2(1270) resonance. An improved 90% confidence level upper limit ℬ(η′(958) → π +π - < 2.9 × 10 -3 is obtained for P- and CP-violating decay of the η′(958) meson using the most conservative assumption about the interference with the background. ©2007 The Physical Society of Japan.