Measurement Of E(+)E(-) -> Pi(+)Pi(-)Psi(2s) Via Initial State Radiation At Belle

X L Wang, C Z Yuan,C P Shen,Peng Wang,A Abdesselam,I Adachi, H Aihara,S Al Said,K Arinstein,D M Asner,R Ayad,A M Bakich,Vikas Bansal,B Bhuyan,A Bobrov,G Bonvicini,M Bracko,T E Browder, D Cervenkov,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 Dolezal, Z Drasal,A Drutskoy,K Dutta,S Eidelman,H Farhat, J 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,Kyung Ho Kang,E Kato, T Kawasaki, C Kiesling,D Y Kim,H J Kim, Jeong Bin Kim,M J Kim,S H Kim,Y J Kim,Kengo Kinoshita,B R Ko, P Kodys,S Korpar, P Krizan,P Krokovny,A Kuzmin,Y J Kwon,J S Lange,I S Lee,P Lewis, Yenhan 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,Chan Won Park,Hongkyu Park,T K Pedlar, R Pestotnik, M Petric,L E Piilonen, E Ribezl,M Ritter, A Rostomyan, Seongyeol 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,Youn Soo Sohn,A Sokolov, E Solovieva, M Staric, M Steder, T Sumiyoshi,U Tamponi,K Tanida,G Tatishvili,Y Teramoto, K Trabelsi,Masayuki 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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