(g− 2)_μand α(M²_Z) re-evaluated using new precise data

Top Cited Papers

24 June 2011

journal article
research article
Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics

Vol. 38 (8)
https://doi.org/10.1088/0954-3899/38/8/085003

Abstract

We update our standard model predictions for g - 2 of the muon and for the hadronic contributions to the running of the QED coupling, Delta alpha((5))(had)(M-Z(2)). Particular emphasis is put on recent changes in the hadronic contributions from new data in the 2 pi channel and from the energy region just below 2 GeV. In particular, for the e(+)e(-) -> pi(+)pi(-) contribution we include the recent 'radiative return' data from KLOE and BaBar. We also include the recent BaBar data on other exclusive channels. We make a detailed study of the effect of replacing the measurements of the inclusive cross section, sigma(e(+)e(-) -> hadrons), by the sum of the exclusive channels in the energy interval 1.43 < root s < 2 GeV, which includes a QCD sum-rule analysis of this energy region. Our favoured prediction for the muon anomalous magnetic moment is (g - 2)/2 = (11 659 182.8 +/- 4.9) x 10(-10) which is 3.3 sigma below the present world-average measurement. We compare our g - 2 value with other recent calculations. Our prediction for the QED coupling, obtained via Delta alpha((5))(had)(M-Z(2)) = (276.26 +/- 1.38) x 10(-4), is alpha(M-Z(2))(-1) = 128.944 +/- 0.019.

Keywords

All Related Versions

This publication has 55 references indexed in Scilit:

Measurement of ratios of branching fractions and $C P$ -violating asymmetries of $B^{\pm} \to D^{*} K^{\pm}$ decays
Physical Review D, 2008
Review of Particle Physics
Physics Letters B, 2008
Measurement of the $e^{+} e^{-} \to K^{+} K^{-}$ cross section in the energy range $\sqrt{s} = 1.04 - 1.38 GeV$ with the SND detector at the VEPP-2M $e^{+} e^{-}$ collider
Physical Review D, 2007
Measurements of the Continuum $R_{u d s}$ and $R$ Values in $e^{+} e^{-}$ Annihilation in the Energy Region between 3.650 and 3.872 GeV
Physical Review Letters, 2006
Experimental study of the reaction e + e − → K S K L in the energy range √S = 1.04−1.38 GeV
Journal of Experimental and Theoretical Physics, 2006
Update of the e + e − → π+π− cross section measured by the spherical neutral detector in the energy region 400 < √s < 1000 MeV
Journal of Experimental and Theoretical Physics, 2006
$e^{+} e^{-} \to π^{+} π^{-} π^{+} π^{-}$ , $K^{+} K^{-} π^{+} π^{-}$ , and $K^{+} K^{-} K^{+} K^{-}$ cross sections at center-of-mass energies 0.5–4.5 GeV measured with initial-state radiation
Physical Review D, 2005
Update: A reanalysis of hadronic cross section measurements at CMD-2
Physics Letters B, 2004
rhad: A program for the evaluation of the hadronic R-ratio in the perturbative regime of QCD
Computer Physics Communications, 2003
Refinements in electroweak contributions to the muon anomalous magnetic moment
Physical Review D, 2003

(g− 2)μand α(M2Z) re-evaluated using new precise data

Abstract

Keywords

All Related Versions

(g− 2)_μand α(M²_Z) re-evaluated using new precise data