New physics explanations of aμ in light of the FNAL muon g − 2 measurement

A bstract The Fermilab Muon g − 2 experiment recently reported its first measurement of the anomalous magnetic moment a μ FNAL , which is in full agreement with the previous BNL measurement and pushes the world average deviation ∆ a μ 2021 from the Standard Model to a significance of 4 . 2 σ . Here...

Full description

Saved in:
Bibliographic Details
Published in:The journal of high energy physics Vol. 2021; no. 9; pp. 1 - 115
Main Authors: Athron, Peter, Balázs, Csaba, Jacob, Douglas H. J., Kotlarski, Wojciech, Stöckinger, Dominik, Stöckinger-Kim, Hyejung
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 14.09.2021
Springer Nature B.V
SpringerOpen
Subjects:
Beyond Standard Model
Chirality
Classical and Quantum Gravitation
Constraint modelling
Couplings
Dark matter
Elementary Particles
High energy physics
Large Hadron Collider
Magnetic moments
Muons
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
String Theory
Supersymmetric Standard Model
Supersymmetric Standard Model
Beyond Standard Model
ISSN:1029-8479, 1029-8479
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A bstract The Fermilab Muon g − 2 experiment recently reported its first measurement of the anomalous magnetic moment a μ FNAL , which is in full agreement with the previous BNL measurement and pushes the world average deviation ∆ a μ 2021 from the Standard Model to a significance of 4 . 2 σ . Here we provide an extensive survey of its impact on beyond the Standard Model physics. We use state-of-the-art calculations and a sophisticated set of tools to make predictions for a μ , dark matter and LHC searches in a wide range of simple models with up to three new fields, that represent some of the few ways that large ∆ a μ can be explained. In addition for the particularly well motivated Minimal Supersymmetric Standard Model, we exhaustively cover the scenarios where large ∆ a μ can be explained while simultaneously satisfying all relevant data from other experiments. Generally, the a μ result can only be explained by rather small masses and/or large couplings and enhanced chirality flips, which can lead to conflicts with limits from LHC and dark matter experiments. Our results show that the new measurement excludes a large number of models and provides crucial constraints on others. Two-Higgs doublet and leptoquark models provide viable explanations of a μ only in specific versions and in specific parameter ranges. Among all models with up to three fields, only models with chirality enhancements can accommodate a μ and dark matter simultaneously. The MSSM can simultaneously explain a μ and dark matter for Bino-like LSP in several coannihilation regions. Allowing under abundance of the dark matter relic density, the Higgsino- and particularly Wino-like LSP scenarios become promising explanations of the a μ result.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP09(2021)080