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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2005, vol. 621, p. 41-55

Measurement of γγ → pp̄ production at Belle

Kuo C. C., Abe K., Adachi I., Aihara H., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bracko M., Chang M. C., Chang P., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Enari Y., Fratina S., Gabyshev N., Gershon T., Go A., Gokhroo G., Gorišek A., Haba J., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Kang J. H., Kang J. S., Kapusta P., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. M., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Leder G., Lesiak T., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Mand F., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Mizuk R., Moloney G. R., Mori T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ostrowicz W., Palka H., Park H., Peak L. S., Pestotnik R., Piilonen L. E., Poluektov A.

A high precision study of the process γγ→pp̄ has been performed using a data sample of 89 fb-1 collected with the Belle detector at the KEKB e+e- collider. The cross section of pp̄ production has been measured at two-photon center-of-mass (c.m.) energies between 2.025 and 4.0 GeV and in the c.m. angular range of |cosθ*|<0.6. Production of γγ→ηc→pp̄ is observed and the product of the two-photon width of the ηc and its branching ratio to pp̄ is determined. © 2005 Elsevier B.V. All rights reserved.