# 2021 Meeting of the Division of Particles and Fields of the American Physical Society (DPF21)

Jul 12 – 14, 2021
Zoom
US/Eastern timezone

## A last chance for kinetic mixing: Explaining $(g-2)_\mu$ with semi-visible dark photons

Jul 13, 2021, 5:00 PM
15m
Track G (Zoom)

### Track G

#### Zoom

talk Beyond Standard Model Physics

### Speaker

Matheus Hostert (University of Minnesota)

### Description

We revisit the solution to the $(g-2)_\mu$ puzzle based on a kinetically mixed dark photon. Despite this scenario being excluded in minimal models with fully visible and fully invisible dark photon decays, we show that semi-visible scenarios are still allowed by explicitly re-evaluating constraints from B-factories and fixed-target experiments. Such a solution points to dark photons with masses around a few GeV that couple to dark sectors with co-annihilating dark matter particles or heavy neutral leptons. In all models, we predict a large rate of multi-leptons at Belle-II and NA64.

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### Primary author

Matheus Hostert (University of Minnesota)

### Co-authors

Daniele Massaro (Università di Bologna) Silvia Pascoli (Duke University (US)) Asli Abdullahi (University of Durham)

### Presentation materials

 dark_photon_mhostert.pdf Recording