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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2007, vol. 651, p. 15-21

A study of γ γ → KS 0 KS 0 production at energies from 2.4 to 4.0 GeV at Belle

Chen W. T., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Aulchenko V., Bakich A. M., Barberio E., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Dalseno J., Dash M., Drutskoy A., Eidelman S., Epifanov D., Go A., Ha H., Hazumi M., Heffernan D., Higuchi T., Hokuue T., Hoshi Y., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Kaji H., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Kim Y. J., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee S. E., Lesiak T., Lin S. W., Liventsev D., Majumder G., Mandl F., Matsumoto T., Matyja A., McOnie S., Medvedeva T., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Mori T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Onuki Y., Ozaki H., Pakhlov P., Pakhlova G., Palka H., Park C. W., Pestotnik R., Piilonen L. E.

KS 0 KS 0 production in two-photon collisions has been studied using a 397.6 fb-1 data sample collected with the Belle detector at the KEKB e+ e- collider. For the first time the cross sections are measured in the two-photon center-of-mass energy range between 2.4 GeV and 4.0 GeV and angular range | cos θ* | < 0.6. Combining the results with measurements of γ γ → K+ K- from Belle, we observe that the cross section ratio σ (KS 0 KS 0) / σ (K+ K-) decreases from ∼0.13 to ∼0.01 with increasing energy. Signals for the χc 0 and χc 2 charmonium states are also observed. © 2007 Elsevier B.V. All rights reserved.