Measurement of the η→3π0 slope parameter α with the KLOE detector

F. Ambrosino,A. Antonelli,M. Antonelli,F. Archilli,P. Beltrame, G. Bencivenni, C. Bini,C. Bloise,S. Bocchetta,F. Bossi,P. Branchini, P. Campana,G. Capon,T. Capussela, F. Ceradini, P. Ciambrone,E. De Lucia,A. De Santis,P. De Simone,G. De Zorzi

Physics Letters B（2010）

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摘要

We present a measurement of the slope parameter α for the η→3π0 decay, with the KLOE experiment at the DAΦNE ϕ-factory, based on a background free sample of ∼17 million η mesons produced in ϕ radiative decays. By fitting the event density in the Dalitz plot we determine α=−0.0301±0.0035stat−0.0035+0.0022syst. The result is in agreement with recent measurements from hadro- and photo-production experiments.

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关键词

e+e− collisions,ϕ radiative decays,η decays

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