Radiative vertex $VPγ$ and $η-η'$ mixing in light-cone sum rules

Details Radiative vertex $VPγ$ and $η-η'$ mixing in light-cone sum rules Radiative vertex $VPγ$ and $η-η'$ mixing in light-cone sum rules

2010-10-22

arxiv.org/abs/1010.4623v2

Phys.Lett.B696:51-57,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 12 figures, 2 tables

Scientific paper

10.1016/j.physletb.2010.12.002

In this work, we calculate radiative vertex $VP\gamma$ ($V=\phi,\omega,\rho$ and $P=\eta,\eta'$) by utilizing $\omega-\phi$ mixing scheme and taking into account the contributions of the three-particle twist-4 distribution amplitudes of the photon in QCD sum rules on light cone. According to experimental data of $V\rightarrow P\gamma$ and $P\rightarrow V\gamma$ from PDG, a value of the $\eta-\eta^\prime$ mixing angle, $\phi=(40.9\pm0.5)^\circ$, is extracted in the framework of the quark-flavor basis to describe the $\eta-\eta^\prime$ system.

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