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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 90, p. -

Observation of a new charged charmoniumlike state in B ¯ 0 →j/ψK-π+ decays observation of a new charged charmoniumlike ... K. Chilikin et al.

Chilikin K., Mizuk R., Adachi I., Aihara H., Al Said S., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Ayad R., Aziz T., Bakich A. M., Bansal V., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chistov R., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Danilov M., DoleŽal Z., Drásal Z., Drutskoy A., Dutta K., Eidelman S., Epifanov D., Farhat H., Fast J. E., Ferber T., Frost O., Gaur V., Gabyshev N., Ganguly S., Garmash A., Gillard R., Goh Y. M., Golob B., Grzymkowska O., Haba J., Hara T., Hayasaka K., Hayashii H., He X. H., Hou W. S., Huschle M., Hyun H. J., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Joo K. K., Julius T., Kawasaki T., Kiesling C., Kim D. Y., Kim H. J., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kuzmin A., Kwon Y. J., Lange J. S., Li Y., Li Gioi L., Libby J., Liu Y., Liventsev D., Lukin P., Miyabayashi K., Miyata H., Mohanty G. B., Moll A.

© 2014 American Physical Society. We present the results of an amplitude analysis of B¯0→J/ψK-π+ decays. A new charged charmoniumlike state Zc(4200)+ decaying to J/ψπ+ is observed with a significance of 6.2σ. The mass and width of the Zc(4200)+ are 4196-29-13+31+17MeV/c2 and 370-70-132+70+70MeV, respectively; the preferred assignment of the quantum numbers is JP=1+. In addition, we find evidence for Zc(4430)+→J/ψπ+. The analysis is based on a 711fb-1 data sample collected by the Belle detector at the asymmetric-energy e+e- collider KEKB.