In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 2 ( 2023-02-16)
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 − → π 0 π 0 ψ 2 (3823) for the first time with a statistical significance of 6 . 0 standard deviations. The ratio of average cross sections for e + e − → π 0 π 0 ψ 2 (3823) and π + π − ψ 2 (3823) is determined to be $$ \mathcal{R}=\frac{\sigma \left[{e}^{+}{e}^{-}\to {\pi}^0{\pi}^0{\psi}_2(3823)\right]}{\sigma \left[{e}^{+}{e}^{-}\to {\pi}^{+}{\pi}^{-}{\psi}_2(3823)\right] }=0.57\pm 0.14\pm 0.05 $$ R = σ e + e − → π 0 π 0 ψ 2 3823 σ e + e − → π + π − ψ 2 3823 = 0.57 ± 0.14 ± 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 ψ 2 (3823) is measured to be M [ ψ 2 (3823)] = 3824 . 5 ± 2 . 4 ± 1 . 0 MeV/ c 2 . Due to the limited data sample, an upper limit of 18.8 MeV at 90% confidence level is set on the intrinsic width of ψ 2 (3823).
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP02(2023)171
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
2027350-2
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