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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2003, vol. 573, p. 63-79

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

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.

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 = 3096.9174 ± 0.010 ± 0.0007 MeV, M ψ′ = 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. © 2003 Elsevier B.V. All rights reserved.