Precise measurements of the eta and the neutral kaon meson masses with the KLOE detector

Details Precise measurements of the eta and the neutral kaon meson masses with the KLOE detector Precise measurements of the eta and the neutral kaon meson masses with the KLOE detector

2007-10-31

arxiv.org/abs/0710.5892v1

JHEP 0712:073,2007

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 8 figures Submitted to Physics Letters B

Scientific paper

10.1088/1126-6708/2007/12/073

We present precise measurements of the eta and K0 masses using the processes phi to eta gamma, eta to gamma gamma and phi to Ks Kl, Ks to pi+ pi-. The K0 mass measurement, M_K=497.583 +/- 0.005 (stat) +/- 0.020 (syst) MeV, is in acceptable agreement with the previous measurements but is more accurate. We find m(eta) = 547.874 +/- 0.007 (stat) +/- 0.031 (syst) MeV. Our value is the most accurate to date and is in agreement with two recent measurements based on eta decays, but is inconsistent, by about 10 sigma, with a measurement of comparable precision based on eta production at threshold.

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