A precision determination of the mass of the $η$ meson

Details A precision determination of the mass of the $η$ meson A precision determination of the mass of the $η$ meson

2005-05-04

arxiv.org/abs/hep-ex/0505006v2

Phys.Lett.B619:281-287,2005

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 6 figures, Fig. 3 changed

Scientific paper

10.1016/j.physletb.2005.06.004

Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the $\eta$ meson is seen clearly as a sharp missing--mass peak on a slowly varying background in the $p+d\to ^3\textrm{He} +X$ reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the $\eta$ meson. The final result, $m(\eta)=547.311\pm 0.028 \textrm{(stat)} \pm 0.032 \textrm{(syst) MeV/c}^2$, 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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