Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published June 1, 2014 | Published + Submitted
Journal Article Open

Study of the reaction e^+ e^− → ψ(2S)π^+ π^− via initial-state radiation at BaBar


We study the process e^+ e^− →ψ(2S)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 at and near the Υ(nS) (n=2,3,4) resonances and correspond to an integrated luminosity of 520  fb^(−1). We investigate the ψ(2S)π^+ π^− mass distribution from 3.95 to 5.95  GeV/c^2, and measure the center-of-mass energy dependence of the associated e^+ e^− →ψ(2S)π^+ π^− cross section. The mass distribution exhibits evidence of two resonant structures. A fit to the ψ(2S)π^+ π^− mass distribution corresponding to the decay mode ψ(2S)→J/ψπ^+ π^− yields a mass value of 4340±16 (stat) ±9 (syst)  MeV/c^2 and a width of 94±32 (stat) ±13 (syst)  MeV for the first resonance, and for the second a mass value of 4669±21 (stat) ±3 (syst)  MeV/c^2   and a width of 104±48 (stat) ±10 (syst)  MeV . In addition, we show the π^+ π^− mass distributions for these resonant regions.

Additional Information

© 2014 American Physical Society. Received 29 November 2012; Published 25 June 2014. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II2 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), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (U.S.A).

Attached Files

Published - PhysRevD.89.111103.pdf

Submitted - 1211.6271v2.pdf


Files (1.2 MB)
Name Size Download all
486.0 kB Preview Download
714.4 kB Preview Download

Additional details

August 20, 2023
October 17, 2023