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Conference Papers Year : 2014

e+e− results from BABAR and implications for the muon g-2

M. Davier
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The BaBar collaboration has nearly completed a program of precise measurements of the cross sections for the dominant channels of e+e−→hadronse+e−→hadrons from threshold to an energy of 3–5 GeV using the initial-state radiation (ISR) method, i.e . the measurement of the cross sections View the MathML sourcee+e−→γhadrons with the energetic γ detected at large angle to the beams. These data are used as input to vacuum polarization dispersion integrals, in particular the hadronic contribution to the muon g−2g−2 anomaly. In addition to the recently measured π+π−π+π− cross section, giving the dominant contibution, many multihadronic channels have been investigated, with some recent examples presented here. We give preliminary results for the process e+e−→K+K−(γ)e+e−→K+K−(γ) using 232fb−1232fb−1 of data collected with the BaBar detector at e+e−e+e− center-of-mass energies near 10.6 GeV. The lowest-order contribution to the hadronic vacuum polarization term in the muon magnetic anomaly is obtained for this channel: View the MathML sourceaμKK,LO=(22.95±0.14(stat)±0.22(syst))×10−10, which is about a factor of three more precise than the previous world average value.

Dates and versions

in2p3-00764849 , version 1 (12-02-2013)



M. Davier. e+e− results from BABAR and implications for the muon g-2. 12th International Workshop on Tau Lepton Physics (TAU2012), Sep 2012, Nagoya, Japan. pp.123-126, ⟨10.1016/j.nuclphysbps.2014.09.030⟩. ⟨in2p3-00764849⟩
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