We present precise measurements of the eta and K-0 masses using the processes phi -> eta gamma, eta -> gamma gamma and phi -> KSKL, K-S -> pi(+)pi(-). The K-0 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) +/- 0.029(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.

Ambrosino, F., Antonelli, A., Antonelli, M., Archillia, F., Bacci, C., Beltrame, P., et al. (2007). Precise measurements of the eta meson and the neutral kaon masses with the KLOE detector RID C-6238-2011 RID D-2250-2011 RID G-6301-2011 RID C-9722-2011 RID D-2615-2009 RID A-6640-2010. JOURNAL OF HIGH ENERGY PHYSICS(12), 1-13 [10.1088/1126-6708/2007/12/073].

Precise measurements of the eta meson and the neutral kaon masses with the KLOE detector RID C-6238-2011 RID D-2250-2011 RID G-6301-2011 RID C-9722-2011 RID D-2615-2009 RID A-6640-2010

CERADINI, Filippo;DI MICCO, Biagio;
2007-01-01

Abstract

We present precise measurements of the eta and K-0 masses using the processes phi -> eta gamma, eta -> gamma gamma and phi -> KSKL, K-S -> pi(+)pi(-). The K-0 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) +/- 0.029(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.
2007
Ambrosino, F., Antonelli, A., Antonelli, M., Archillia, F., Bacci, C., Beltrame, P., et al. (2007). Precise measurements of the eta meson and the neutral kaon masses with the KLOE detector RID C-6238-2011 RID D-2250-2011 RID G-6301-2011 RID C-9722-2011 RID D-2615-2009 RID A-6640-2010. JOURNAL OF HIGH ENERGY PHYSICS(12), 1-13 [10.1088/1126-6708/2007/12/073].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/121914
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