Observation of a new charged charmoniumlike state in B ¯ 0 → J / ψ K − π + decays

• Published in: Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2014-12, Vol.90 (11), Article 112009
• Main Authors: 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., Mori, T., Mussa, R., Nakano, E., Nakao, M., Nanut, T., Natkaniec, Z., Nedelkovska, E., Nisar, N. K., Nishida, S., Ogawa, S., Okuno, S., Olsen, S. L., Pakhlov, P.
• Format: Article
• Language: English
• ISSN: 1550-7998; 1550-2368
• DOI: 10.1103/PhysRevD.90.112009

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+31-29+17-13 MeV/c2 and 370+70-70+70-132 MeV, 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 711 fb-1 data sample collected by the Belle detector at the asymmetric-energy e+e- collider KEKB.