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

• Published in: Physics letters. B Vol. 573; pp. 63 - 79
• Main 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., Kremyanskaya, E.V., Levichev, E.B., Malyshev, V.M., Maslennikov, A.L., Meshkov, O.I., Mishnev, S.E., Muchnoi, N.Yu, Naumenkov, A.I., Nikitin, S.A., Nikolaev, I.B., Onuchin, A.P., Oreshkin, S.B., Pakhotin, Yu.A., Peleganchuk, S.V., Petrosyan, S.S., Petrov, V.V., Poluektov, A.O., Polunin, A.A., Pospelov, G.E., Protopopov, I.Ya, Savinov, G.A., Shamov, A.G., Shatilov, D.N., Shusharo, A.I., Shwartz, B.A., Sidorov, V.A., Simonov, E.A., Skovpen, Yu.I., Skrinsky, A.N., Soukharev, A.M., Talyshev, A.A., Tayursky, V.A., Telnov, V.I., Tikhonov, Yu.A., Todyshev, K.Yu, Tumaikin, G.M., Usov, Yu.V., Vorobiov, A.I., Yushkov, A.N., Zatsepin, A.V., Zhilich, V.N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.10.2003
• Subjects: Depolarization technique; Energy calibration; J/ψ-meson; Mass measurement; ψ′-meson; 29.27.Hj; Energy calibration; 14.40.Gx; Mass measurement; Depolarization technique; J/ψ-meson; 13.66.Bc; ψ′-meson; 29.20
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2003.08.028

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: MJ/ψ=3096.917±0.010±0.007 MeV,Mψ′=3686.111±0.025±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.