We present precise measurements of the eta and K0 masses using the processes phi -> eta gamma, eta -> gamma gamma, and phi -> KSKL, KS -> pi+ pi-. The K0 mass measurement, MK = 497.583 ± 0.005stat ± 0.020syst MeV, is in acceptable agreement with the previous measurements but is more accurate. We find meta = 547.874 ± 0.007stat ± 0.029syst 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 10sigma, with a measurement of comparable precision based on eta production at threshold
Bacci, C., Ceradini, F., DI MICCO, B., Nguyen, F., Bocchetta, S., Ambrosino, F. (2007). Precise measurement of the eta and the K0 mesons mass with the KLOE detector. JOURNAL OF HIGH ENERGY PHYSICS, 12, 073, 1-13.
Precise measurement of the eta and the K0 mesons mass with the KLOE detector
BACCI, Cesare;CERADINI, Filippo;DI MICCO, Biagio;NGUYEN, FEDERICO;
2007-01-01
Abstract
We present precise measurements of the eta and K0 masses using the processes phi -> eta gamma, eta -> gamma gamma, and phi -> KSKL, KS -> pi+ pi-. The K0 mass measurement, MK = 497.583 ± 0.005stat ± 0.020syst MeV, is in acceptable agreement with the previous measurements but is more accurate. We find meta = 547.874 ± 0.007stat ± 0.029syst 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 10sigma, with a measurement of comparable precision based on eta production at thresholdI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
