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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2009, vol. 79, p. -

Measurement of the e+e-→J/ψcc̄ cross section at s 10.6GeV

Pakhlov P., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bondar A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chen A., Cheon B. G., Chistov R., Choi S. K., Choi Y., Danilov M., Dash M., Drutskoy A., Dungel W., Eidelman S., Epifanov D., Gabyshev N., Goldenzweig P., Golob B., Ha H., Han B. Y., Hayasaka K., Hayashii H., Hazumi M., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Iwasaki Y., Joshi N. J., Kah D. H., Kaji H., Kawai H., Kawasai T., Kichimi H., Kim H. O., Kim Y. I., Kinoshita K., Ko B. R., Korpar S., Krian P., Krokovny P., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. E., Lesiak T., Lin S. W., Liu Y., Liventsev D., Louvot R., Mandl F., Matyja A., McOnie S., Miyata H., Miyazaki Y., Mizuk R., Nagasaka Y., Nakao M., Nakazawa H., Nishimura K., Nitoh O., Ogawa S., Ohshima T., Okuno S., Ozaki H., Pakhlova G., Palka H., Park C. W., Park H.

We present a new measurement of the e+e-→J/ψcc̄ cross section where the cc̄ pair can fragment either into charmed hadrons or a charmonium state. In the former case the J/ψ and a charmed hadron are reconstructed, while the latter process is measured using the recoil mass technique, which allows the identification of two-body final states without reconstruction of one of the charmonia. The measured e+e-→J/ψcc̄ cross section is (0.74±0.08+0.09-0.08)pb, and the e+e-→J/ψXnon- cc̄ cross section is (0.43±0.09±0.09)pb. We note that the measured cross sections are obtained from a data sample with the multiplicity of charged tracks in the event larger than 4; corrections for the effect of this requirement are not performed as this cannot be done in a model-independent way. The analysis is based on a data sample with an integrated luminosity of 673fb-1 recorded near the Υ(4S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider. © 2009 The American Physical Society.