The anomalous magnetic moment of the muon: Beyond the Standard Model via chiral enhancement

Crivellin, Andreas (2023) The anomalous magnetic moment of the muon: Beyond the Standard Model via chiral enhancement. Il nuovo cimento C, 46 (1). pp. 1-9. ISSN 1826-9885

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Abstract

The anomalous magnetic moment of the muon displays a 4.2σ tension with the Standard-Model prediction, if e+e− → hadrons data are used for hadronic vacuum polarization. In these proceedings we review possible explanations of this anomaly in terms of heavy new particles. As the necessary effect is of the order of the electroweak Standard-Model contribution, viable explanations with TeV-scale physics must involve an enhancement factor; in particular, one can obtain the chirality flip of the dipole operator via a sizable coupling to the Higgs doublet instead of the small muon Yukawa coupling. Such Standard-Model extensions then also predict effects in Higgs and Z-boson decays to muons, with details depending on the SU(2)L × U(1)Y representations of the new particles. We first review the general case of chirally enhanced new physics, before discussing in more detail the concrete example of leptoquark models.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	02 Feb 2023 13:38
Last Modified:	02 Feb 2023 13:38
URI:	http://eprints.bice.rm.cnr.it/id/eprint/22245

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