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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2008, vol. 100, p. -

Production of new charmoniumlike states in e+e-→J/ψD(*) D̄(*) at s 10.6GeV

Pakhlov P., Adachi I., Aihara H., Arinstein K., Aushev T., Aziz T., Bakich A. M., Balagura V., Barberio E., Bedny I., Belous K., Bhardwaj V., Bitenc U., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi Y., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Golob B., Ha H., Hayasaka K., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim Y. J., Kinoshita K., Korpar S., Krizan P., Krokovny P., Kumar R., Kuo C. C., Kwon Y. J., Lange J. S., Lee M. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu Y., Liventsev D., Mandl F., Matyja A., Medvedeva T., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Moloney G. R., Mori T., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlova G., Palka H., Park C. W., Peak L. S., Pestotnik R.

We report a study of the processes e+e-→J/ψD(*)D̄(*). In J/ψD*D̄* we observe a significant enhancement in the D*D̄* invariant mass spectrum, which we interpret as a new charmoniumlike state and denote X(4160). The X(4160) parameters are M=(4156-20+25±15)MeV/c2 and Γ=(139-61+111±21)MeV. We also report a new measurement of the X(3940) mass and width: M=(3942-6+7±6) MeV/c2 and Γ=(37-15+26±8)MeV. The analysis is based on a 693fb-1 data sample recorded near the Υ(4S) resonance by the Belle detector at the KEKB asymmetric-energy collider. © 2008 The American Physical Society.