New precision measurement of the $J/\psi$- and ${\psi }^{\prime }$ -meson masses

Abstract

A new high precision measurement of the $J/\psi$- and ${\psi }^{\prime }$-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: $M_{J/\psi }=3096.917\pm 0.010\pm 0.007$ MeV, $M_{{\psi }^{\prime }}=3686.111\pm 0.025\pm 0.009$ MeV. The relative measurement accuracy has reached $4.10^{-6}$ for $J/\psi$ and $7.10^{-6}$ for ${\psi }^{\prime }$, approximately 3 times better than in the previous precise experiments.

12 pages, 4 tables, 10 figures

References in corpus (2)

• Intrabeam scattering analysis of measurements at KEK's ATF damping ring
• High Precision Mass Measurements in $\Psi$ and ${\rm Y}$ Families Revisited

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