The hadronic vacuum polarization contribution to (gμ − 2): Lattice QCD+QED calculations

Giusti, D. and Simula, S. (2020) The hadronic vacuum polarization contribution to (gμ − 2): Lattice QCD+QED calculations. Il nuovo cimento C, 43 (2-3). pp. 1-5. ISSN 1826-9885

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Abstract

The anomalous magnetic moment of the muon aμ is one of the most accurate quantities in Particle Physics. The long-standing discrepancy of about 3.7 standard deviations between the experimental value and the prediction of the Standard Model could represent an intriguing indication of New Physics. The experiments at Fermilab (E989) and at J-PARC (E34) aim at reducing significantly the experimental uncertainty, thus making the theoretical one due to hadronic corrections the main limitation of this stringent test of the Standard Model. In this contribution we present the results of a first-principle lattice calculation of the hadronic vacuum polarization (HVP) contribution to aμ, including electromagnetic and SU(2)-breaking corrections. Our determination, aHVP μ = 682.0 ∼ (18.7) · 10−10, turns out to be in agreement with recent theoretical determinations based on the dispersive analyses of the experimental cross section data for the annihilation process e+e− → hadrons. Furthermore, we provide for the first time a lattice estimate for the missing part of aHVP μ not covered in the MUonE experiment, [aHVP μ ]> = 91.6 ∼ (2.0) · 10−10.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	10 Feb 2021 16:50
Last Modified:	10 Feb 2021 16:50
URI:	http://eprints.bice.rm.cnr.it/id/eprint/20771

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