Improved determination of the hadronic contribution to the muon (

Alemany, R.; Davier, M.; Höcker, A.

doi:10.1007/s100520050127

Cited by 152 publications

(297 citation statements)

References 32 publications

(63 reference statements)

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“…(11) have been carried out by a number of authors [13,14,15,16,17,18,19,20]. The most precise published analysis to date, due to Davier and Höcker [14,15,16], found a Had µ (vac.…”

Section: Hadronic Loop Correctionsmentioning

confidence: 99%

Muon anomalous magnetic moment: A harbinger for “new physics”

2001

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QED, Hadronic, and Electroweak Standard Model contributions to the muon anomalous magnetic moment, a µ ≡ (g µ − 2)/2, and their theoretical uncertainties are scrutinized. The status and implications of the recently reported 2.6 sigma experiment vs. theory deviation a exp µ − a SM µ = 426(165) × 10 −11 are discussed. Possible explanations due to supersymmetric loop effects with m SUSY ≃ 55 √ tan β GeV, radiative mass mechanisms at the 1-2 TeV scale and other "New Physics" scenarios are examined.

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“…(11) have been carried out by a number of authors [13,14,15,16,17,18,19,20]. The most precise published analysis to date, due to Davier and Höcker [14,15,16], found a Had µ (vac.…”

Section: Hadronic Loop Correctionsmentioning

confidence: 99%

Muon anomalous magnetic moment: A harbinger for “new physics”

2001

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“…First of all, we start by fitting separately e + e − and τ data, in the timelike region, using (3.9a) (we remark that although in a(2π; t ≤ 0.8 GeV 2 ) only 5 At the level of 1.5 to 2σ. 6 The relevance of isospin breaking in this context was pointed out by V. Cirigliano, G. This takes into account statistical errors only for e + e − , but includes systematic ones for τ decay as these are incorporated in the available data.…”

Section: Fitsmentioning

confidence: 99%

Precision determination of the pion form factor and calculation of the muong−2

Trocóniz

Ynduráin

2002

Phys. Rev. D

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We perform a new calculation of the hadronic contributions, a(Hadronic) to the anomalous magnetic moment of the muon, aµ. For the low energy contributions of order α 2 we carry over an analysis of the pion form factor Fπ(t) using recent data both on e + e − → π + π − and τ + →ντ π + π 0 . In this analysis we take into account that the phase of the form factor is equal to that of ππ scattering. This allows us to profit fully from analyticity properties so we can use also experimental information on Fπ(t) at spacelike t. At higher energy we use QCD to supplement experimental data, including the recent measurements of e + e − → hadrons both around 1 GeV and near thecc threshold. This yields a precise determination of the O(α 2 ) and O(α 2 ) + O(α 3 ) hadronic part of the photon vacuum polarization pieces, 10 11 × a (2) (h.v.p.) = 6 909 ± 64; 10 11 × a (2+3) (h.v.p.) = 7 002 ± 66 As byproducts we also get the masses and widths of the ρ 0 , ρ + , and very accurate values for the charge radius and second coefficient of the pion.Adding the remaining order α 3 hadronic contributions we find 10 11 × a theory (Hadronic) = 6 993 ± 69 (e + e − + τ + spacel.)The error above includes statistical, systematic and estimated theoretical errors. The figures given are obtained including τ decay data; if we restrict ourselves to e + e − data, slightly lower values and somewhat higher errors are found. This is to be compared with the figure obtained by subtracting pure electroweak contributions from the recent experimental value, obtained from measurements of the muon gyromagnetic ratio (g − 2), which reads 10 11 × a exp. (Hadronic) = 7 174 ± 150.Typeset with P H ys Ma T E X -precision determination of the pion form factor and calculation of the muon g − 2-

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“…polarisation (∆α (5) had (m 2 Z )): There are also several evaluations of ∆α (5) had (m 2 Z ) [12][13][14][15][16][17][18][19] which are more theory-driven. One of the most recent ones (Reference [18]) also includes the new results from BES, yielding 0.02738 ± 0.00020.…”

Section: Theoretical and Parametric Uncertaintiesmentioning

confidence: 99%

Electroweak fits at LEP

Lançon

2002

Nuclear Physics B - Proceedings Supplements

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High precision electroweak measurements performed over ten years at LEP and SLC have allowed to constrain the Standard Model of electroweak interactions. The model have been used to predict the mass of the top quark and to set limits on the mass of the Higgs boson. Why electroweak fits?Electroweak fits have been extensively used at LEP and SLC for testing the Standard Model at the level of its quantum corrections, searching for deviations that may signal the presence of new physics. They have also successively predicted the top quak mass prior to its discovery and recently, allowed to set limit on the Higgs boson mass. Sensitivity to top quark and Higgs boson masses can be infered from the following exemple relation :where ∆r contains several terms: ∆α (due to light fermion masses), a negative term (several %) proportional to m 2 t and a relatively small (below 1%) term proportional to ln(m H ). Therefore, the inferred constraints on m H are much weaker than those on m t .Before LEP startup, the W and Z boson masses were measured to be 80.000 ± 0.360 GeV and 91.120 ± 0.160 GeV respectively. These measurements were equivalent to a precision on the weak mixing angle sin 2 θ W of 3.7% worse than the direct measurement itself: 0.227 ± 0.006 corresponding to 2.6%. That is the reason why inputs to the Standard Model fits were α, G F and sin 2 θ W .

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Improved determination of the hadronic contribution to the muon (

Cited by 152 publications

References 32 publications

Muon anomalous magnetic moment: A harbinger for “new physics”

Muon anomalous magnetic moment: A harbinger for “new physics”

Precision determination of the pion form factor and calculation of the muong−2

Electroweak fits at LEP

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