Douglas Jacob (Monash University): New Physics Explanations of g-2 in light of the FNAL muon g-2 measurement

How to connect:

• zoom link

Abstract:

The Fermilab Muon g−2 experiment reported the results of its Run-1
measurement of the anomalous magnetic moment of the muon, which is in full
agreement with the previous BNL measurement and pushes the world average
deviation from the Standard Model to a significance of 4.2 standard
deviations. In this talk I will present an extensive survey of its impact
on beyond the Standard Model physics, based on the work in Ref. [1]. In
this work we used state-of-the-art calculations and a sophisticated set of
tools to make predictions for muon g-2, dark matter and LHC searches. We
examined a wide range of simple models with up to three new fields, which
represent some of the few ways that large muon g-2 can be explained. The
results show that the new measurement excludes a large number of models and
provides crucial constraints on others. Generally, these models provide
viable explanations of the muon g-2 result only by using rather small
masses and/or large couplings with chirality flip enhancements, which can
lead to conflicts with limits from LHC and dark matter experiments. I will
present results for a range of models including scalar leptoquarks and
simple models constructed to explain dark matter and g-2 simultaneously.

[1] Athron P, Balázs C, Jacob D H, Kotlarski W, Stöckinger D and
Stöckinger-Kim H 2021 (Preprint 2104.03691)