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What is the scale of new physics behind the muon g-2?

Allwicher, Lukas; Di Luzio, Luca; Fedele, Marco 1; Mescia, Federico; Nardecchia, Marco
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)


We study the constraints imposed by perturbative unitarity on the new physics interpretation of the muon g−2 anomaly. Within a Standard Model effective field theory approach, we find that scattering amplitudes sourced by effective operators saturate perturbative unitarity at about 1 PeV. This corresponds to the highest energy scale that needs to be probed in order to resolve the new physics origin of the muon g−2 anomaly. On the other hand, simplified models (e.g., scalar-fermion Yukawa theories) in which renormalizable couplings are pushed to the boundary of perturbativity still imply new on-shell states below 200 TeV. We finally suggest that the highest new physics scale responsible for the anomalous effect can be reached in nonrenormalizable models at the PeV scale.

Verlagsausgabe §
DOI: 10.5445/IR/1000138931
Veröffentlicht am 13.10.2021
DOI: 10.1103/PhysRevD.104.055035
Zitationen: 9
Web of Science
Zitationen: 6
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2470-0010, 0556-2821, 1089-4918, 1538-4500, 1550-2368, 1550-7998, 2470-0029
KITopen-ID: 1000138931
Erschienen in Physical Review D
Verlag American Physical Society (APS)
Band 104
Heft 5
Seiten Art.-Nr.: 055035
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in arXiv
Web of Science
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