Search for the Isospin Violating Decay Y(4260) → J/ψηπ⁰


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.



Monte Carlo method, Electrons, Y(4260), Particles (Nuclear physics), Astronomy, Causality (Physics), Branching fractions (Nuclear physics), Photons, Isobaric spin

National Key Basic Research Program of China (contract no. 2015CB856700); National Natural Science Foundation of China (NSFC) (contract nos. 11125525, 11235011, 11322544, 11335008, 11425524); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (contract nos. 11179007, U1232201, U1332201); CAS (contract nos. KJCX2-YW-N29, KJCX2- YW-N45); German Research Foundation DFG (contract no. Collaborative Research Center CRC-1044); Ministry of Development of Turkey contract no. DPT2006K- 120470); Russian Foundation for Basic Research (contract no.14-07-91152); US Department of Energy (contract nos. DE-FG02-04ER41291, DEFG02- 05ER41374, DE-FG02-94ER40823, DESC0010118); WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0).


©2015 American Physical Society