Study of the reaction e+e− → J/ψπ+π− via initial-state radiation at BABAR

We study the process e + e − → J / ψ π + π − 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 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454 fb − 1 . We investi...

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Veröffentlicht in:	Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2012-09, Vol.86 (5)
Hauptverfasser:	Tisserand, V., Palano, A., Eigen, G., Kolomensky, Yu. G., Koch, H., Khan, A., Bondioli, M., Kirkby, D., Gary, J. W., Long, O., Vitug, G. M., Richman, J. D., West, C. A., Lockman, W. S., Chao, D. S., Cheng, C. H., Porter, F. C., Sokoloff, M. D., Bloom, P. C., Smith, J. G., Wagner, S. R., Schubert, K. R., Schwierz, R., Playfer, S., Fioravanti, E., Baldini-Ferroli, R., Patteri, P., Peruzzi, I. M., Piccolo, M., Contri, R., Lo Vetere, M., Patrignani, C., Lacker, H. M., Behera, P. K., Meyer, W. T., Rubin, A. E., Derkach, D., Le Diberder, F., Roudeau, P., Lange, D. J., Coleman, J. P., Payne, D. J., Denig, A. G., Fritsch, M., Hafner, A., Prencipe, E., Lafferty, G. D., Hamilton, B., Lindemann, D., Robertson, S. H., Biassoni, P., Cremaldi, L., Nguyen, X., Martinelli, M., Jessop, C. P., LoSecco, J. M., Kass, R., Brau, J., Strom, D., Morandin, M., Rotondo, M., Simonetto, F., Calderini, G., Biasini, M., Angelini, C., Batignani, G., Bettarini, S., Forti, F., Oberhof, B., Paoloni, E., Ferrarotto, F., Leddig, T., Voss, C., Waldi, R., Olaiya, E. O., Hamel de Monchenault, G., Vasseur, G., Ebert, M., Gabareen, A. M., Kelsey, M. H., Lewis, P., Luitz, S., Muller, D. R., Neal, H., Su, D., Wulsin, H. W., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Guttman, N., Soffer, A., Ritchie, J. L., Ruland, A. M., Martinez-Vidal, F., Ahmed, H., Kowalewski, R., Lewczuk, M. J., Sobie, R. J., Puccio, E. M. T., Dasu, S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Energia Energy Experiments Física de partícules Mass (Physics) Massa (Física) Particle physics
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Zusammenfassung:	We study the process e + e − → J / ψ π + π − 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 10.58 and 10.54 GeV, and correspond to an integrated luminosity of 454 fb − 1 . We investigate the J / ψ π + π − mass distribution in the region from 3.5 to 5.5 GeV / c 2 . Below 3.7 GeV / c 2 the ψ ( 2 S ) signal dominates, and above 4 GeV / c 2 there is a significant peak due to the Y ( 4260 ) . A fit to the data in the range 3.74 - 5.50 GeV / c 2 yields a mass value 4245 ± 5 ( stat ) ± 4 ( syst ) MeV / c 2 and a width value 114 + 16 − 15 ( stat ) ± 7 ( syst ) MeV for this state. We do not confirm the report from the Belle Collaboration of a broad structure at 4.01 GeV / c 2 . In addition, we investigate the π + π − system which results from Y ( 4260 ) decay.
ISSN:	1550-7998 1550-2368
DOI:	10.1103/PhysRevD.86.051102