Observation of e+e−→ π0π0ψ2(3823)

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doi:10.1007/jhep02(2023)171

Abstract

Using a data sample corresponding to an integrated luminosity of 11.3 fb−1 collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we observe the process e+e−→ π0π0ψ2(3823) for the first time with a statistical significance of 6.0 standard deviations. The ratio of average cross sections for e+e−→ π0π0ψ2(3823) and π+π−ψ2(3823) is determined to be mathcal{R}=frac{sigma left[{e}^{+}{e}^{-}to {pi}^0{pi}^0{psi}_2(3823)right]}{sigma left[{e}^{+}{e}^{-}to {pi}^{+}{pi}^{-}{psi}_2(3823)right]}=0.57pm 0.14pm 0.05 , which is consistent with expectations from isospin symmetry. Here and below, the first uncertainties are statistical and the second are systematic. The mass of the ψ2(3823) is measured to be M[ψ2(3823)] = 3824.5 ± 2.4 ± 1.0 MeV/c2. Due to the limited data sample, an upper limit of 18.8 MeV at 90% confidence level is set on the intrinsic width of ψ2(3823).

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