Measurement of $φ$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider

Details Measurement of $φ$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider Measurement of $φ$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider

2010-10-23

arxiv.org/abs/1010.4878v2

Phys.Lett.B695:412-418,2011

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 3 figures

Scientific paper

10.1016/j.physletb.2010.11.050

The $\phi$(1020) meson leptonic width has been determined from the combined analysis of 4 major decay modes of the resonance ($\phi\to K^+ K^-,K^0_LK^0_S,\pi^+\pi^-\pi^0,\eta\gamma$) studied with the CMD-2 detector at the VEPP-2M $e^+e^-$ collider. The following value has been obtained: $\Gamma(\phi\to e^+e^-) = 1.235\pm 0.006\pm 0.022$ keV. The $\phi(1020)$ meson parameters in four main decay channels have been also recalculated: $B(\phi\to K^+K^-) = 0.493\pm 0.003\pm 0.007$, $B(\phi\to K_LK_S) = 0.336\pm 0.002\pm 0.006$, $B(\phi\to\pi^+\pi^-\pi^0) = 0.155\pm 0.002\pm 0.005$, $B(\phi\to\eta\gamma) = 0.0138\pm 0.0002\pm 0.0002$.

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