Scattering of nucleons on cold-dark-matter particles through photonic portal

TL;DR

This paper explores how protons and neutrons scatter differently on dark matter particles via a photonic portal, providing calculations of differential cross-sections that reveal unique scattering behaviors relevant to hidden sector models.

Contribution

It introduces a model with a photonic portal connecting hidden and Standard-Model sectors, and calculates differential cross-sections for nucleon-dark matter interactions.

Findings

Protons exhibit a Coulomb-like forward singularity in scattering.

Neutrons scatter differently due to the model's mechanism.

The model offers a natural explanation for scattering differences.

Abstract

In the model of hidden sector proposed recently, protons and neutrons scatter differently on cold-dark-matter particles. First, we summarize briefly our model based on a mechanism of "photonic portal" between hidden and Standard-Model sectors of the Universe. Then, we calculate in an elementary way the differential cross-sections for scattering of protons and neutrons on sterile Dirac fermions ("sterinos") playing the role of cold-dark-matter particles. They interact with nucleons through the photonic portal in a somewhat involved but natural manner. Due to this portal, the differential cross-section for protons displays a Coulomb-like forward singularity.