期刊
PHYSICS LETTERS B
卷 541, 期 1-2, 页码 45-51出版社
ELSEVIER
DOI: 10.1016/S0370-2693(02)02145-7
关键词
e(+)e(-) collisions; phi radiative decays; pseudoscalar mixing angle
We have measured the radiative decays phi --> etagamma, phi --> eta'gamma selecting pi(+)pi(-)gammagammagamma final state in a sample of similar to 5 x 10(7) phi-mesons produced at the Frascati phi-factory DAPhiNE. We obtain Gamma(phi --> eta'gamma)/Gamma(phi --> etagamma) = (4.70 +/- 0.47 +/- 0.31) x 10(-3). From this result we derive new accurate values for the branching ratio BR(phi --> eta'gamma) = (6.10 +/- 0.61 +/- 0.43) x 10(-5) and the mixing angle of pseudoscalar mesons in the flavour basis phi(P) = (41.8(-1.6)(+1.9))degrees. (C) 2002 Elsevier Science B.V. All rights reserved.
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