A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta' meson

Details A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta' meson A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta' meson

2009-06-20

arxiv.org/abs/0906.3819v1

JHEP 0907:105,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 7 figures to submit to JHEP

Scientific paper

10.1088/1126-6708/2009/07/105

We update the values of the eta-eta' mixing angle and of the eta' gluonium content by fitting our measurement R_phi = BR(phi to eta' gamma)/ BR(phi to eta gamma) together with several vector meson radiative decays to pseudoscalars (V to P gamma), pseudoscalar mesons radiative decays to vectors (P to V gamma) and the eta' to gamma gamma, pi^0 to gamma gamma widths. From the fit we extract a gluonium fraction of Z^2_G = 0.12 +- 0.04, the pseudoscalar mixing angle psi_P = (40.4 +- 0.6) degree and the phi-omega mixing angle psi_V = (3.32 +- 0.09) degree. Z^2_G and psi_P are fairly consistent with those previously published. We also evaluate the impact on the eta' gluonium content determination of future experimental improvements of the eta' branching ratios and decay width.

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