New measurements of the $η$ and $K^0$ masses

Details New measurements of the $η$ and $K^0$ masses New measurements of the $η$ and $K^0$ masses

2002-04-08

arxiv.org/abs/hep-ex/0204008v1

Phys.Lett.B533:196-206,2002

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, 4 figures to be published in Physics Letters B

Scientific paper

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.

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