Detection of phi --> eta' photon, phi --> eta photon in pi+ pi- three photons final state with KLOE at DAFNE

Details Detection of phi --> eta' photon, phi --> eta photon in pi+ pi- three photons final state with KLOE at DAFNE Detection of phi --> eta' photon, phi --> eta photon in pi+ pi- three photons final state with KLOE at DAFNE

2001-07-10

arxiv.org/abs/hep-ex/0107022v1

Physics

High Energy Physics

High Energy Physics - Experiment

Contributed paper to Lepton Photon 2001, Rome July 23-28

Scientific paper

KLOE has collected about 30 pb^-1 in year 2000 at the DAFNE collider, which yields the largest population of phi meson radiative decays studied so far. We present the result obtained for phi-->eta photon and phi -->eta' photon: the ratio of these two BR's has been measured to be (5.3 +- 0.5 +- 0.3) times 10^-3, leading to a very accurate determination of the mixing angle in the flavor basis (40 +1.7 -1.5 degrees) and to the most accurate determination of BR(phi -->eta' photon) to date: (6.8 +- 0.6 +-0.5) times 10^-5.

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