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Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Lynch, G.; Asgeirsson, D. J.; So, R. Y.; Khan, A.; Buzykaev, A. R.; Druzhinin, V. P.; Onuchin, A. P.; Serednyakov, S. I.; Bondioli, M.; Lankford, A. J.; Long, O.; Vitug, G. M.; Eisner, A. M.; Seiden, A.; Cheng, C. H.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Ayad, R.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Playfer, S.; Bettoni, D.; Bozzi, C.; Luppi, E.; Patteri, P.; Lo Vetere, M.; Passaggio, S.; Patrignani, C.; Bhuyan, B.; Lee, C. L.; Morii, M.; Chen, C.; Cochran, J.; Guo, Z. J.; Derkach, D.; Grosdidier, G.; Schune, M. H.; Fry, J. R.; Sacco, R.; Davis, C. L.; Griessinger, K.; Hafner, A.; Hamilton, B.; Biassoni, P.; Palombo, F.; Stracka, S.; Cremaldi, L.; Summers, D. J.; Sciacca, C.; Martinelli, M.; Strom, D.; Torrence, E.; Gagliardi, N.; Margoni, M.; Rotondo, M.; Bomben, M.; Ocariz, J.; Pacetti, S.; Bettarini, S.; Cervelli, A.; Giorgi, M. A.; Smith, A. J. S.; Li Gioi, L.; Piredda, G.; Leddig, T.; Schröder, H.; Voß, C.; Vasseur, G.; Cartaro, C.; Convery, M. R.; Ebert, M.; Field, R. C.; Hast, C.; Kocian, M. L.; Schindler, R. H.; Va’vra, J.; Wulsin, H. W.; Park, W.; Wilson, J. R.; Bellis, M.; Alam, M. S.; Peimer, D. R.; Spanier, S. M.; Schwitters, R. F.; Wray, B. C.; Izen, J. M.; Zambito, S.; Martinez-Vidal, F.; Albert, J.; Kowalewski, R.; Sobie, R. J.; Latham, T. E.
Physical review. D, Particles, fields, gravitation, and cosmology, 06/2014, Letnik: 89, Številka: 11Journal Article
We study the process $e^+e^-\to\psi(2S)\pi^{+}\pi^{-}$ with initial-state-radiation events produced at the PEP-II asymmetric-energy collider. The data were recorded with the \BaBar detector at center-of-mass energies at and near the $\Upsilon(\mathrm{nS})$ (n = 2, 3, 4) resonances and correspond to an integrated luminosity of 520$fb^{-}$. We investigate the $\psi(2S)\pi^{+}\pi^{-}$ mass distribution from 3.95 to 5.95 $GeV/c^{2}$, and measure the center-of-mass energy dependence of the associated $e^+e^-\to \psi(2S)\pi^{+}\pi^{-}$ cross section. The mass distribution exhibits evidence of two resonant structures. A fit to the $\psi(2S)\pi^{+}\pi^{-}$ mass distribution corresponding to the decay mode $\psi(2S)\to J/\psi \pi^{+}\pi^{-}$ yields a mass value of $4340 \pm16$ (stat) $\pm 9$ (syst) ${\mathrm {MeV/c^{2}}}and a width of $94 \pm 32$ (stat) $\pm 13$ (syst) MeV for the first resonance, and for the second a mass value of $4669 \pm 21$ (stat) $\pm 3$ (syst) ${\mathrm {MeV/c^{2}}}$ and a width of $104 \pm 48$ (stat) $\pm 10$ (syst) MeV. In addition, we show the $pi^{+}\pi^{-}$ mass distributions for these resonant regions.
