1998/08/04 by Alexander Studenikin, Studenikin, Alexander
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9808219
22 pages, 5 figures, Talk given on the les Pecontres de Physique de la Vallee D'Aoste (Results and Perspectives in Particle Physics), 2-7 March,1998, La Thuile, Italy
arxiv created 1998/08/04 · arxiv updated 2009/11/30
A review of the theoretical and experimental values for the charged lepton (electron and muon) anomalous magnetic moment al= (gl-2)/2 is presented. Employing the most accurate value for the fine structure constant α-1= 137.03599993(52) (0.0038 ppm) obtained \cite Kin196 from the electron (g-2) we find the new complete standard model prediction for the anomalous magnetic moment of the muon athμ= 116591595(67)× 10-11. The comparison of this theoretical value and the precise experimental result \cite Sch yields the estimation for the difference Δaμ= aexpμ- athμ at the 95% confidence level: -95 × 10-10 ≤ Δaμ≤ 236 × 10-10. The implication of the expected a factor of about 20 increase of accuracy in the forthcoming Brookhaven National Laboratory measurement of aμ implies -47 × 10-11 ≤ Δaμ≤ 118 × 10-11, (95 % C.L.). This interval is used to get constraints on the "new physics". The value of the one-loop contributions aBil of different bosons predicted within extension of the standard model and coupled to a charged lepton are discussed. The dependence of aBil on the masses of the bosons and leptons of the vacuum polarization loops are investigated. The constraints on "new physics" by requiring that the new contributions aBiμ to the muon anomalous magnetic moment lie within the latter interval Δaμ are obtained.