# Constraints on charmphilic solutions to the muon g-2 with leptoquarks

## TL;DR

This paper investigates constraints on charmphilic leptoquark models explaining the muon g-2 anomaly, finding that only certain scalar leptoquarks remain viable and will be fully tested by upcoming LHC data.

## Contribution

It provides the first comprehensive analysis of flavor and collider constraints on charmphilic leptoquarks addressing muon g-2, highlighting the remaining viable parameter space.

## Key findings

- Scalar leptoquark S_1 can still explain muon g-2 within 2σ.
- LHC with 300/fb can fully probe the surviving parameter space.
- Other models are excluded by LHC and flavor constraints.

## Abstract

We derive constraints from flavor and LHC searches on charmphilic contributions to the muon anomalous magnetic moment with a single leptoquark. Only the scalar leptoquarks $S_1$ and $R_2$ are relevant for the present analysis. We find that for $S_1$ some parameter space remains consistent at $2\sigma$ with the Brookhaven National Laboratory measurement of the muon $g-2$, under the assumption that the left-type coupling between the muon and the charm quark is a free parameter. The surviving parameter space is, on the other hand, going to be probed in its entirety at the LHC with 300/fb of luminosity or less. All other possibilities are excluded by the LHC dimuon search results in combination with several flavor bounds, which together require one to introduce sizable couplings to the top quark to be evaded.