Measurement of the eta mass at KLOE

Details Measurement of the eta mass at KLOE Measurement of the eta mass at KLOE

2007-07-31

arxiv.org/abs/0707.4616v1

Eur.Phys.J.A38:125-127,2008

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 8 figures, Contributed paper to Lepton Photon 2007

Scientific paper

10.1140/epja/i2008-10659-5

An integrated luminosity of 410 pb^(-1), corresponding to ~ 17 million of eta events, has been analyzed to measure the eta mass using the decay eta to gamma gamma. The measurement is insensitive to the calorimeter energy calibration and the systematic error on the measurement is dominated by the uniformity of the detector response. As a cross check of the method the pi0 mass from the decay phi to pi0 gamma, pi0 to gamma gamma has been measured and it is in agreement with the most accurate previous determinations. The result obtained is m(eta) = 547.873 +/- 0.007 (stat.) +/- 0.031 (syst.) MeV, that is today best measurement of the eta mass.

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