Probing Positron Gravitation at HERA

TL;DR

This paper proposes a novel high-energy Compton scattering method to test positron gravity, using HERA data to suggest a potential difference in gravitational coupling between positrons and electrons.

Contribution

It introduces a new experimental approach to probe positron gravity and analyzes existing HERA data to explore possible deviations from expected gravitational interactions.

Findings

HERA Compton spectra exclude anti-gravity for positrons.

Data hints at positrons having ~1.3% weaker gravitational coupling than electrons.

Method provides a new way to test fundamental gravitational symmetry.

Abstract

An equality of particle and antiparticle gravitational interactions holds in general relativity and is supported by indirect observations. Here I develop a method based on high energy Compton scattering to measure the gravitational interaction of accelerated charged particles. Within that formalism the Compton spectra measured at HERA rule out the positron's anti-gravity and hint for a positron's 1.3(0.2)\% weaker coupling to the gravitational field relative to an electron.