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  • Measurement of e + e − → π ...
    Yuan, C. Z.; Shen, C. P.; Wang, P.; Abdesselam, A.; Adachi, I.; Aihara, H.; Al Said, S.; Arinstein, K.; Asner, D. M.; Bhuyan, B.; Browder, T. E.; Chang, P.; Chekelian, V.; Chistov, R.; Cho, K.; Chobanova, V.; Choi, S.-K.; Choi, Y.; Cinabro, D.; Dalseno, J.; Doležal, Z.; Drutskoy, A.; Dutta, K.; Eidelman, S.; Farhat, H.; Fast, J. E.; Ferber, T.; Gaur, V.; Garmash, A.; He, X. H.; Hou, W.-S.; Iijima, T.; Inami, K.; Ishikawa, A.; Joffe, D.; Julius, T.; Kang, K. H.; Kato, E.; Kim, D. Y.; Kim, H. J.; Kim, J. B.; Kim, J. H.; Kim, S. H.; Kim, Y. J.; Kinoshita, K.; Korpar, S.; Krokovny, P.; Kuzmin, A.; Kwon, Y.-J.; Lange, J. S.; Lewis, P.; Li, Y.; Libby, J.; Liventsev, D.; Lukin, P.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mori, T.; Mussa, R.; Nakao, M.; Natkaniec, Z.; Nishida, S.; Ogawa, S.; Okuno, S.; Olsen, S. L.; Pakhlov, P.; Pakhlova, G.; Park, H.; Pestotnik, R.; Ribežl, E.; Rostomyan, A.; Sakai, Y.; Sanuki, T.; Savinov, V.; Schneider, O.; Schnell, G.; Semmler, D.; Shebalin, V.; Shibata, T.-A.; Shiu, J.-G.; Sibidanov, A.; Sohn, Y.-S.; Solovieva, E.; Starič, M.; Steder, M.; Tanida, K.; Tatishvili, G.; Trabelsi, K.; Unno, Y.; Uno, S.; Van Hulse, C.; Varner, G.; Vinokurova, A.; Wagner, M. N.; Yashchenko, S.; Yusa, Y.; Zhilich, V.; Zupanc, A.

    Physical review. D, Particles, fields, gravitation, and cosmology, 06/2015, Letnik: 91, Številka: 11
    Journal Article

    We report here measurement of the cross section of e+e- → π+π-ψ ( 2S ) between 4.0 and 5.5 GeV, based on an analysis of initial state radiation events in a 980fb-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 π+π-ψ ( 2S ) with two coherent Breit-Wigner functions, we discover two solutions with identical mass and width but different couplings to electron-positron pairs: MY ( 4360 ) = ( 4347±6±3 ) MeV / c2 , Γ Y ( 4360 ) = ( 103±9±5 ) MeV , MY ( 4660 ) = ( 4652±10±8 ) MeV / c2 , Γ Y ( 4660 ) = ( 68±11±1 ) MeV ; and B Y ( 4360 ) → π+π-ψ ( 2S ) · Γ Y ( 4360 ) e+e-= ( 10.9±0.6±0.7 ) eV and B Y ( 4660 ) → π+π-ψ ( 2S ) · Γ Y ( 4660 ) e+e-= ( 8.1±1.1±0.5 ) eV for one solution; or B Y ( 4360 ) → π+π-ψ ( 2S ) · Γ Y ( 4360 ) e+e-= ( 9.2±0.6±0.6 ) eV and B Y ( 4660 ) → π+π=ψ ( 2S ) · Γ Y ( 4660 ) e+e-= ( 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 4.05GeV / c2 is observed in the π±ψ ( 2S ) intermediate state in the Y ( 4360 ) decays. decays.