The International School for Advanced Studies (SISSA) was founded in 1978 and was the first institution in Italy to promote post-graduate courses leading to a Doctor Philosophiae (or PhD) degree. A centre of excellence among Italian and international universities, the school has around 65 teachers, 100 post docs and 245 PhD students, and is located in Trieste, in a campus of more than 10 hectares with wonderful views over the Gulf of Trieste.
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Precise measurements of the η meson and the neutral kaon masses with the KLOE detector
The KLOE collaboration1, F. Ambrosino4, A. Antonelli1, M. Antonelli1, F. Archilli1, C. Bacci7, P. Beltrame2, G. Bencivenni1, S. Bertolucci1, C. Bini6, C. Bloise1, S. Bocchetta7, F. Bossi1, P. Branchini7, R. Caloi6, P. Campana1, G. Capon1, T. Capussela1, F. Ceradini7, S. Chi1, G. Chiefari4, P. Ciambrone1, E. De Lucia1, A. De Santis6, P. De Simone1, G. De Zorzi6, A. Denig2, A. Di Domenico6, C. Di Donato4, B. Di Micco7, A. Doria4, M. Dreucci1, G. Felici1, A. Ferrari1, M. L. Ferrer1, S. Fiore6, C. Forti1, P. Franzini6, C. Gatti1, P. Gauzzi6, S. Giovannella1, E. Gorini3, E. Graziani7, W. Kluge2, V. Kulikov10, F. Lacava6, G. Lanfranchi1, J. Lee-Franzini1,8, D. Leone2, M. Martini1, P. Massarotti4, W. Mei1, S. Meola4, S. Miscetti1, M. Moulson1, S. Müller1, F. Murtas1, M. Napolitano4, F. Nguyen7, M. Palutan1, E. Pasqualucci6, A. Passeri7, V. Patera1,5, F. Perfetto4, M. Primavera3, P. Santangelo1, G. Saracino4, B. Sciascia1, A. Sciubba1,5, A. Sibidanov1, T. Spadaro1, M. Testa6, L. Tortora7, P. Valente6, G. Venanzoni1, R. Versaci1 and G. Xu1,9
We present precise measurements of the η and K0 masses using the processes
ϕ→ηγ, η→γγ and ϕ → KS K L, KS→π+π−.
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 mη = 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 η decays, but is
inconsistent, by about 10σ, with a measurement of
comparable precision based on η production at threshold.
