Neutron Majorana mass from Exotic Instantons in a Pati-Salam model

TL;DR

This paper explores how exotic stringy instantons in a Pati-Salam model can generate neutron Majorana masses, with implications for neutron oscillations, neutrino masses, baryogenesis, dark matter, and collider physics.

Contribution

It introduces a simple quiver Pati-Salam model where exotic instantons induce neutron Majorana masses, linking string theory effects to observable phenomena.

Findings

Proposes a model for neutron-antineutron oscillations testable in future experiments.

Connects instanton effects to neutrino Majorana masses and baryogenesis.

Discusses potential experimental constraints from LHC, dark matter, and rare processes.

Abstract

We show how exotic stringy instantons can generate an effective interaction between color diquark sextets in a Pati-Salam model, inducing a Majorana mass term for the neutron. In particular, we discuss a simple quiver theory for a Pati-Salam like model, as an example in which the calculations of exotic instantons' effects are simple and controllable. We discuss some different possibilities in order to generate $n-\bar{n}$ oscillation testable in the next generation of experiments, Majorana mass matrices for neutrini and a Post-Sphaleron Baryogenesis scenario. Connections with Dark Matter issues and the Higgs mass Hierarchy problem are discussed, in view of implications for LHC and rare processes physics. The model may be viewed as a completion of Left-Right symmetry, alternative to a GUT-inspired scenario. Combined measures in Neutron-Antineutron physics, FCNC, LHC, Dark Matter could rule out the proposed model or uncover aspects of physics at the Planck scale!