New precision measurement of the J/ψ- and ψ′-meson masses.

Authors :: Aulchenko, V. M.
Balashov, S. A.
Baldin, E. M.
Barnyakov, M. Yu.
Baru, S. E.
Bedny, I. V.
Beloborodova, O. L.
Blinov, A. E.
Blinov, V. E.
Bogomyagkov, A. V.
Bondar, A. E.
Bondarev, D. V.
Buzykaev, A. R.
Eidelman, S. I.
Groshev, V. R.
Karnaev, S. E.
Kiselev, V. A.
Kononov, S. A.
Kotov, K. A.
Kravchenko, E. A.
Source :: AIP Conference Proceedings; 2004, Vol. 717 Issue 1, p591-591, 1p
Publication Year :: 2004
Abstract: A new high precision measurement of the J/Ψ- and Psi′-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<subscript>J/Ψ</subscript> = 3096.917 ± 0.010 ± 0.007 MeV, M<subscript>Ψ′</subscript> = 3686.111 ± 0.025 ± 0.009 MeV. The relative measurement accuracy has reached 4.10<superscript>-6</superscript> for J/Ψ and 7.10<superscript>-6</superscript> for Ψ′, approximately 3 times than in the previous precise experiments. The description of the experiment and the error analysis can be found in hep-ex/0306050, Phys. Lett. B573 (2003) 63-79. [ABSTRACT FROM AUTHOR]