Observation of e+e-→K+K-J/ψ via initial-state radiation at Belle

Yuan, C.Z. ; Shen, C.P. ; Wang, P. ; Wang, X.L. ; Adachi, I. ; Aihara, H. ; Arinstein, K. ; Aulchenko, V. ; Aushev, T. ; Bakich, A.M. ; Balagura, V. ; Barberio, E. ; Belous, K. ; Bitenc, U. ; Bondar, A. ; Bračko, M. ; Brodzicka, J. ; Browder, T.E. ; Chao, Y. ; Chen, A. ; Chen, W.T. ; Cheon, B.G. ; Chistov, R. ; Cho, I.-S. ; Choi, Y. ; Dalseno, J. ; Danilov, M. ; Das, A. ; Dash, M. ; Eidelman, S. ; Epifanov, D. ; Gabyshev, N. ; Golob, B. ; Ha, H. ; Haba, J. ; Hayasaka, K. ; Hazumi, M. ; Heffernan, D. ; Hokuue, T. ; Hoshi, Y. ; Hou, W.-S. ; Hyun, H.J. ; Inami, K. ; Ishikawa, A. ; Ishino, H. ; Itoh, R. ; Iwasaki, Y. ; Kah, D.H. ; Kang, J.H. ; Kawai, H. ; Kawasaki, T. ; Kichimi, H. ; Kim, Y.J. ; Kinoshita, K. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kumar, R. ; Kuo, C.C. ; Kuzmin, A. ; Kwon, Y.-J. ; Lee, M.J. ; Lee, S.E. ; Lesiak, T. ; Lin, S.-W. ; Liventsev, D. ; Mandl, F. ; Matyja, A. ; McOnie, S. ; Medvedeva, T. ; Mitaroff, W. ; Miyabayashi, K. ; Miyake, H. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Mohapatra, D. ; Moloney, G.R. ; Nagasaka, Y. ; Nakao, M. ; Nishida, S. ; Nitoh, O. ; Noguchi, S. ; Nozaki, T. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Olsen, S.L. ; Pakhlov, P. ; Pakhlova, G. ; Park, C.W. ; Park, H. ; Peak, L.S. ; Piilonen, L.E. ; Sahoo, H. ; Sakai, Y. ; Schneider, O. ; Schümann, J. ; Senyo, K. ; Sevior, M.E. ; Shapkin, M. ; Shibuya, H. ; Shiu, J.-G. ; Shwartz, B. ; Singh, J.B. ; Somov, A. ; Stanič, S. ; Starič, M. ; Sumiyoshi, T. ; Takasaki, F. ; Tamai, K. ; Tanaka, M. ; Teramoto, Y. ; Tikhomirov, I. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Varner, G. ; Vervink, K. ; Villa, S. ; Wang, C.C. ; Wang, C.H. ; Watanabe, Y. ; Won, E. ; Yabsley, B.D. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Zhang, C.C. ; Zhang, Z.P. ; Zupanc, A. ; Zyukova, O.

The process e+e-→K+K-J/ψ is observed for the first time via initial-state radiation. The cross section of e+e-→K+K-J/ψ for center-of-mass energies between threshold and 6.0 GeV is measured using 673fb-1 of data collected with the Belle detector on and off the Υ(4S) resonance. No significant signal for Y(4260)→K+K-J/ψ is observed, and we determine B(Y(4260)→K+K-J/ψ)Γ(Y(4260)→e+e-)<1.2eV/c2 at a 90% confidence level. We also find evidence for e+e-→KS0KS0J/ψ in the same data sample. © 2008 The American Physical Society.


Published in:
Physical Review D - Particles, Fields, Gravitation and Cosmology, 77, 1, 011105
Year:
2008
Other identifiers:
Scopus: 2-s2.0-38349088372
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