Measurement of the leptonic decay widths of the phi-meson with the KLOE detector
F.Ambrosino, et al
TL;DR
This paper measures the leptonic decay widths of the phi-meson using the KLOE detector, providing precise values that test lepton universality.
Contribution
It presents the first precise measurements of phi-meson leptonic widths Gee and Gmm using e+e- data, confirming lepton universality.
Findings
Measured Gee=1.32±0.05±0.03 keV
Measured sqrt(Gee×Gmm)=1.320±0.018±0.017 keV
Results support lepton universality
Abstract
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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