Measurement of the leptonic decay widths of the phi-meson with the KLOE detector

Details Measurement of the leptonic decay widths of the phi-meson with the KLOE detector Measurement of the leptonic decay widths of the phi-meson with the KLOE detector

2004-11-26

arxiv.org/abs/hep-ex/0411082v1

Phys.Lett.B608:199-205,2005

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages and 8 figures to be submitted to Phys.Lett.B

Scientific paper

10.1016/j.physletb.2005.01.010

The phi-meson leptonic widths, Gee and Gmm, are obtained, respectively, from the e+e- forward-backward asymmetry and the muon cross section around the phi-mass energy. We find Gee=1.32⊕0.05⊕0.03 kev and sqrt(GeeGmm)= 1.320⊕0.018⊕0.017 kev. These results, compatible with Gee=Gmm, provide a precise test of lepton universality. Combining the two results gives G_lept=1.320⊕0.023 kev.

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