An integrated luminosity of 410 pb-1, corresponding to ∼ 17 million of η events, has been analyzed to measure the η mass using the decay η → γγ. 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 π0 mass from the decay Ø → π0, π0 → has been measured and it is in agreement with the most accurate previous determinations. The result obtained is m η = 547.873±0.007stat. ±0.031syst. MeV, that is today best measurement of the η mass.
Measurement of the η mass at KLOE
Martini M;Meola S;
2007-01-01
Abstract
An integrated luminosity of 410 pb-1, corresponding to ∼ 17 million of η events, has been analyzed to measure the η mass using the decay η → γγ. 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 π0 mass from the decay Ø → π0, π0 → has been measured and it is in agreement with the most accurate previous determinations. The result obtained is m η = 547.873±0.007stat. ±0.031syst. MeV, that is today best measurement of the η mass.File in questo prodotto:
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