2008/08/11 by The BaBar Collaboration, Aubert, B.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.0808.1543
openalex publication_date 2008/08/11 · openalex created_date 2022/09/07 · openalex updated_date 2026/07/28
We present an update of the study of the Y(4260) resonance, produced in the process e+e-→γISR π+π-J/ψ using initial-state radiation events at the PEP-II e+e- storage rings. This study is based on 454fb-1 of data recorded with the \slshape B\kern-0.1em\smaller A\kern-0.1em B\kern-0.1em\smaller A\kern-0.2em R detector at a center-of-mass energy in the Υ(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are mY = 4252 ±6 +2-3MeV/c2 and ΓY = 105 ± 18+4-6MeV/c2; we also measure \calB(π+π-J/ψ)Γe+e- = (7.5± 0.9 ±0.8) eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c2 in this decay mode.