New precision measurement of the $J/ψ$- and $ψ'$ -meson masses
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A new high precision measurement of the $J/ψ$- and $ψ'$-meson masses has been performed at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has been employed for the absolute calibration of the beam energy. The following mass values have been obtained:
$M_{J/ψ} = 3096.917 \pm 0.010 \pm 0.007$ MeV,
$M_{ψ'} = 3686.111 \pm 0.025 \pm 0.009$ MeV.
The relative measurement accuracy has reached $4. 10^{-6}$ for $J/ψ$ and $7. 10^{-6}$ for $ψ'$, approximately 3 times better than in the previous precise experiments.
12 pages, 4 tables, 10 figures
12 pages, 4 tables, 10 figures