TL;DR
This paper reports the most precise measurement of the eta meson mass using the KLOE detector, analyzing a large dataset of eta decay events with a method insensitive to calorimeter calibration.
Contribution
The paper presents a new high-precision eta mass measurement using a decay channel that minimizes systematic uncertainties, improving upon previous results.
Findings
Measured eta mass: 547.873 +/- 0.007 (stat) +/- 0.031 (syst) MeV
Cross-checked pi0 mass consistent with previous measurements
Method reduces systematic errors related to calorimeter calibration
Abstract
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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