Low energy effects of Higgs induced leptoquark-diquark mixing

TL;DR

This paper investigates how Higgs-induced mixing between leptoquarks and diquarks at low energies can reintroduce proton decay channels, challenging previous assumptions and deriving bounds from proton lifetime constraints.

Contribution

It demonstrates that Higgs interactions can cause mixing between leptoquarks and diquarks, leading to proton decay, which was previously assumed to be suppressed.

Findings

Higgs can induce leptoquark-diquark mixing

Mixing reintroduces proton decay channels

Bounds on parameters from proton lifetime constraints

Abstract

In low energy phenomenology to avoid the strong constraints of proton decay it is usually assumed that light ($\approx $ 250 Gev) leptoquarks couple only to quark-lepton pairs and light diquarks couple only to quark pairs. In this work we show that the SM Higgs boson could induce a mixing between leptoquarks and diquarks through trilinear interaction terms which reintroduces the troublesome couplings and lead to proton decay. The bound on the unknown parameters of this scenario that arise from proton life time has also been derived.