Constraining scalar leptoquarks using COHERENT data

TL;DR

This paper uses COHERENT neutrino scattering data to set new constraints on scalar leptoquarks, covering a wide mass range from MeV to TeV, and compares these bounds with other experimental limits.

Contribution

It provides the first constraints on low-scale scalar leptoquarks using COHERENT data, especially for models that avoid proton decay.

Findings

COHERENT data constrains scalar leptoquark masses from MeV to TeV.

Bounds are competitive with other experimental constraints in certain regions.

The study focuses on two specific electroweak doublet scalar leptoquark models.

Abstract

Neutrino-nucleus coherent scattering measurements by the COHERENT collaboration provide us with a unique capability to test various beyond the standard model scenarios. In this work, we constrain scalar leptoquarks (LQs) using the COHERENT data. LQs arise in many extensions of the Standard Model (SM). Generally, the mass of the LQs is assumed to be very high to avoid the bounds from proton decay. However, there are low-scale LQ models which prohibit proton decay by construction. We consider two electroweak doublet scalar LQ models with hypercharge Y=1/6, and Y=7/6 and provide the bounds in the plane of the Yukawa coupling and the mass of LQ. We also compare the bounds on LQs coming from various other experiments and find that the COHERENT one covers a wide range of LQ masses from MeV to TeV and in certain regions the constraints are competitive with the others.