FM
F. Martelli
Author with expertise in Theoretical and Computational Physics
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New measurements of the η and K0 masses

A. Lai et al.May 1, 2002
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New measurements of the $\eta$ and $K^0$ masses have been performed using decays to 3$\pi^0$ with the NA48 detector at the CERN SPS. Using symmetric decays to reduce systematic effects, the results $M(\eta) = 547.843\pm0.051$ MeV/c$^2$ and $M(K^0) = 497.625\pm0.031$ MeV/c$^2$ were obtained.