Search for the Isospin Violating Decay Y(4260) → J/ψηπ⁰
Achasov, M. N.
Ai, X. C.
Ambrose, D. J.
MetadataShow full item record
Using data samples collected at center-of-mass energies of √s̅ = 4.009, 4.226, 4.257, 4.358, 4.416, and 4.599 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the isospin violating decay Y(4260) → J/ψηπ⁰. No signal is observed, and upper limits on the cross section σ(e⁺e⁻ → J/ψηπ⁰) at the 90% confidence level are determined to be 3.6, 1.7, 2.4, 1.4, 0.9, and 1.9 pb, respectively.