# Measurement of Moller Scattering at 2.5 MeV

## TL;DR

This paper reports a high-precision measurement of Moller scattering at 2.5 MeV, validating advanced radiative correction calculations through experimental data and simulations, crucial for precision tests in QED.

## Contribution

The study combines soft- and hard-photon radiative corrections with electron mass effects and experimentally verifies the calculations at 2.5 MeV.

## Key findings

- Good agreement between measured and simulated spectra
- Validation of radiative correction calculations
- Precise momentum spectra at three angles

## Abstract

Moller scattering is one of the most fundamental processes in QED. Understanding it to high precision is necessary for a variety of modern nuclear and particle physics experiments. In a recent calculation, existing soft-photon radiative corrections were combined with new hard-photon bremsstrahlung calculations to take into account the effect of photon emission at any photon energy, where the electron mass was included at all steps. To test the calculation, an experiment was carried out using the 3 MV Van de Graaff electrostatic accelerator at the MIT High Voltage Research Laboratory. Momentum spectra at three scattering angles at an incident electron energy of 2.5 MeV are reported here, and compared to the simulated radiative Moller spectra, based on our previous calculation. Good agreement between the measurements and our calculation is observed in the momentum spectrum at the three angles.