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

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

KLOE

Collaboration

•

F. Ambrosino

Nov, 2004

10 pages

Published in:

Phys.Lett.B 608 (2005) 199-205

e-Print:

hep-ex/0411082 [hep-ex]

DOI:

10.1016/j.physletb.2005.01.010

PDG:

{{\mathit \phi}{(1020)}}

\rightarrow

{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}

Experiments:

FRASCATI-DAFNE-KLOE

View in:

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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.

13.66.Jn
13.20.Gd
Leptonic width
electron positron: colliding beams
electron positron: annihilation
Phi(1020): electroproduction
Phi(1020): leptonic decay
electron: pair production
muon: pair production
angular distribution: asymmetry

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