A high precision measurement of the ϒ, ϒ′ and ϒ″-meson masses

A.S. Artamonov,S. E. Baru,A. E. Blinov,A. Bondar,A. D. Bukin,V.R. Groshiev,Yu. I. Eidelman,N.I. Inozemtsev,V.A. Kiselev,S. G. Klimenko,E. A. Kuper,S. I. Mishnev,S.A. Nikitin,A. P. Onuchin,V. S. Panin,V.V. Petrov,I. Ya. Protopopov,A. G. Shamov,V. Sidorov,A.N. Skrinsky,V.A. Tayursky,V. I. Telnov,A.B. Temnykh,Yu. A. Tikhonov,G.M. Tumaikin,A. Undrus,A. I. Vorobiov,A.I. Yurkov,A. Zholents

A high precision measurement of the ϒ, ϒ′ and ϒ″-meson masses

1984

Abstract An experiment has been performed at the storage ring VEPP-4 using the MD-1 detector. The resonance depolarization method has been employed for the absolute calibration of the beam energy. This has allowed the accuracy of the mass measurement to be improved by a factor of ten. The following mass values of ϒ, ϒ′ and ϒ″ -mesons have been obtained: M ( ϒ )=9460.6±0.4 MeV, M ( ϒ ′)=10023.8±0.5 MeV, M ( ϒ ″)=10355.5±0.5 MeV.

Keywords:

Detector
Meson
Resonance
Storage ring
Atomic physics
Physics
Nuclear magnetic resonance
mass measurement
absolute calibration
Nuclear physics
Electron–positron annihilation
beam energy

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