Measurement ofe+e−→π+π−ψ(2S)via initial state radiation at Belle

X. L. Wang, C. Z. Yuan, C. P. Shen, P. Wang, A. Abdesselam, I. Adachi,H. Aihara,S. Al Said, K. Arinstein, D. M. Asner,R. Ayad, A. M. Bakich,V. Bansal, B. Bhuyan,A. Bobrov, G. Bonvicini, M. Bračko,T. E. Browder,D. Červenkov,P. Chang,V. Chekelian, A. Chen, B. G. Cheon,K. Chilikin, R. Chistov,K. Cho,V. Chobanova,S.-K. Choi, Y. Choi, D. Cinabro,J. Dalseno,M. Danilov,Z. Doležal,Z. Drásal, A. Drutskoy, K. Dutta,S. Eidelman,H. Farhat,J. E. Fast,T. Ferber, V. Gaur, A. Garmash, D. Getzkow, R. Gillard,Y. M. Goh,J. Haba, K. Hayasaka, H. Hayashii,X. H. He, W.-S. Hou,T. Iijima, K. Inami,A. Ishikawa, R. Itoh, Y. Iwasaki, D. Joffe, T. Julius, K. H. Kang, E. Kato,T. Kawasaki,C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, M. J. Kim, S. H. Kim, Y. J. Kim,K. Kinoshita, B. R. Ko,P. Kodyš,S. Korpar,P. Križan,P. Krokovny,A. Kuzmin,Y.-J. Kwon,J. S. Lange,I. S. Lee,P. Lewis, Y. Li,L. Li Gioi,J. Libby,D. Liventsev, P. Lukin,D. Matvienko, K. Miyabayashi, H. Miyata,R. Mizuk, A. Moll, T. Mori,R. Mussa, E. Nakano, M. Nakao,T. Nanut,Z. Natkaniec,N. K. Nisar,S. Nishida, S. Ogawa, S. Okuno,S. L. Olsen,P. Pakhlov,G. Pakhlova, C. W. Park,H. Park, T. K. Pedlar, R. Pestotnik, M. Petrič,L. E. Piilonen, E. Ribežl,M. Ritter,A. Rostomyan, S. Ryu,Y. Sakai,S. Sandilya, L. Santelj, T. Sanuki, V. Savinov,O. Schneider, G. Schnell,C. Schwanda, D. Semmler,K. Senyo, V. Shebalin, T.-A. Shibata, J.-G. Shiu, A. Sibidanov,F. Simon,Y.-S. Sohn, A. Sokolov,E. Solovieva, M. Starič, M. Steder,T. Sumiyoshi,U. Tamponi,K. Tanida, G. Tatishvili, Y. Teramoto,K. Trabelsi, M. Uchida,T. Uglov, Y. Unno,S. Uno,Y. Usov,C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, M. N. Wagner, Y. Watanabe, E. Won,S. Yashchenko, Y. Yusa, Z. P. Zhang,V. Zhilich, A. Zupanc

Physical Review D（2015）

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摘要

We report measurement of the cross section of e(+)e(-) -> pi(+)pi(-)psi(2S) between 4.0 and 5.5 GeV, based on an analysis of initial state radiation events in a 980 fb(-1) data sample recorded with the Belle detector. The properties of the Y(4360) and Y(4660) states are determined. Fitting the mass spectrum of pi(+)pi(-)psi(2S) with two coherent Breit-Wigner functions, we find two solutions with identical mass and width but different couplings to electron-positron pairs: M-Y(4360) = (4347 +/- 6 +/- 3) MeV/c(2), Gamma(Y(4360)) = (103 +/- 9 +/- 5) MeV, M-Y(4660) = (4652 +/- 10 +/- 8) MeV/c(2), Gamma(Y(4660)) = (68 +/- 11 +/- 1) MeV; and B[Y(4360) -> pi(+)pi(-)psi(2S)] . Gamma(e+e-)(Y(4360)) = (10.9 +/- 0.6 +/- 0.7) eV and B[Y(4660) -> pi(+)pi(-)psi(2S)] . Gamma(e+e-)(Y(4660)) = (8.1 +/- 1.1 +/- 0.5) eV for one solution; or B[Y(4360) -> pi(+)pi(-)psi(2S)] . Gamma(e+e-)(Y(4360)) = (9.2 +/- 0.6 +/- 0.6) eV and B[Y(4660) -> pi(+)pi(-)psi(2S)] . Gamma(e+e-)(Y(4660)) = (2.0 +/- 0.3 +/- 0.2) eV for the other. Here, the first errors are statistical and the second systematic. Evidence for a charged charmoniumlike structure at 4.05 GeV/c(2) is observed in the pi(+/-)psi(2S) intermediate state in the Y(4360) decays.

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