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

Abstract

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.

arXiv comment15 pages, 8 figures Submitted to Physics Letters B

References in corpus (10)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Reanalysis of Hadronic Cross Section Measurements at CMD-2
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• Data handling, reconstruction, and simulation for the KLOE experiment
• Measurement of the DA$\Phi$NE luminosity with the KLOE detector using large angle Bhabha scattering
• Measurement of the $\varphi$ meson parameters with CMD-2 detector at VEPP-2M Collider
• A precision determination of the mass of the $\eta$ meson
• New measurements of the $\eta$ and $K^0$ masses
• Measurement of the eta-Meson Mass using psi(2S) --> eta J/psi

Cited by in corpus (4)

• New determination of the mass of the eta meson at COSY-ANKE
• Meta-Stable Brane Configurations with Seven NS5-Branes
• High precision measurement of the masses of the $D^0$ and $K_S$ mesons
• Upper limit on the $\eta \to {\pi }^{+}{\pi }^{-}$ branching fraction with the KLOE experiment