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Published September 1, 2012 | Published
Journal Article Open

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


We study the process e^+e^- → J/ψπ^+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(2S) 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_(-15)^(+16)(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.

Additional Information

© 2012 American Physical Society. Received 11 April 2012; published 12 September 2012. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (USA).

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Published - PhysRevD.86.051102.pdf


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