A precision determination of the mass of the η meson
The GEM collaboration, M. Abdel-Bary, A. Budzanowski, A. Chatterjee, J. Ernst, P. Hawranek, R. Jahn, V. Jha, K. Kilian, S. Kliczewski, D. Kirillov, D. Kolev, M. Kravcikova, T. Kutsarova, M. Lesiak, J. Lieb, H. Machner, A. Magiera, R. Maier, G. Martinska, S. Nedev, N. Piskunov, D. Prasuhn, D. Protić, P. von Rossen, B. J. Roy, I. Sitnik, R. Siudak, M. Smiechowicz, H. J. Stein, R. Tsenov, M. Ulicny, J. Urban, G. Vankova, G. Vankova
Abstract
Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the η meson is seen clearly as a sharp missing--mass peak on a slowly varying background in the p+d 3He +X reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the η meson. The final result, m(η)=547.311 0.028 (stat) 0.032 (syst) MeV/c2, is significantly lower than that found by the recent NA48 measurement, though it is consistent with values obtained in earlier counter experiments.
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