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Evidence of a broad structure at an invariant mass of 4.32 GeV/c2 in the reaction e+e- --> pi+pi-psi(2S) measured at BABAR |
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| Authors: | Aubert B Barate R Bona M Boutigny D Couderc F Karyotakis Y Lees J P Poireau V Tisserand V Zghiche A Grauges E Palano A Chen J C Qi N D Rong G Wang P Zhu Y S Eigen G Ofte I Stugu B Abrams G S Battaglia M Brown D N Button-Shafer J Cahn R N Charles E Gill M S Groysman Y Jacobsen R G Kadyk J A Kerth L T Kolomensky Yu G Kukartsev G Lynch G Mir L M Orimoto T J Pripstein M Roe N A Ronan M T Wenzel W A del Amo Sanchez P Barrett M Ford K E Harrison T J Hart A J Hawkes C M Morgan S E Watson A T Held T Koch H Lewandowski B Pelizaeus M Peters K Schroeder T Steinke M Boyd J T Burke J P Cottingham W N |
| Affiliation: | Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France. |
| Abstract: | We present a measurement of the cross section of the process e(+)e(-)-->pi(+)pi(-)psi(2S) from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the SLAC PEP-II e(+)e(-) storage rings. The study is based on 298 fb(-1) of data recorded with the BABAR detector. A structure is observed in the cross section not far above threshold, near 4.32 GeV. We also investigate the compatibility of this structure with the Y(4260) previously reported by this experiment. |
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