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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2002, vol. 540, p. 33-42

Measurement of Χc2 production in two-photon collisions

Abe K., Abe K., Abe R., Abe T., Adachi I., Ahn B. S., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Bay A., Behera P. K., Bondar A., Bozek A., Bračko M., Brodzicka J., Casey B. C K, Chang P., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Danilov M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Guo R., Handa F., Hara T., Harada Y., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Hojo T., Hokuue T., Hoshi Y., Hoshina K., Hou S. R., Hou W. S., Huang H. C., Igaki T., Igarashi Y., Inami K., Ishikawa A., Itoh R., Iwamoto M., Iwasaki H., Iwasaki Y., Jang H. K., Kaneko J., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim H., Kim H. J., Kim H. O., Kim H., Kim S. K., Kim T. H., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Leder G., Lee S. H., Li J., Liventsev D., Lu R. S., MacNaughton J., Majumder G., Mandl F., Matsumoto S., Matsumoto T., Miyabayashi K., Miyake H., Miyata H.

The production of the Χc2 charmonium state in two-photon collisions has been measured with the Belle detector at the KEKB e+e- collider. A clear signal for Χc2 → γ J / ψ, J / ψ → ℓ+ℓ- is observed in a 32.6 fb-1 data sample accumulated at center-of-mass energies near 10.6 GeV, and the product of its two-photon decay width and branching fraction is determined to be Λγγ (Xc2)Β(Xc2 → γ J / ψ)Β(J / ψ → ℓ+ℓ-) = 13.5 ±(stat.) ± 1.1(syst.) eV. © 2002 Elsevier Science B.V. All rights reserved.