Precision Measurement of sin2(theta_w) at MESA

TL;DR

This paper discusses a planned high-precision experiment at MESA to measure the weak mixing angle via parity-violating electron-proton scattering, aiming to achieve results comparable to Z-pole data.

Contribution

It introduces a new low-energy scattering experiment designed to precisely measure sin^2(theta_w), addressing theoretical challenges for accurate predictions.

Findings

Expected to achieve high-precision measurement of the weak mixing angle

Addresses theoretical challenges for accurate low-energy predictions

Aims to provide results competitive with Z-pole measurements

Abstract

A forthcoming experiment of low-energy elastic electron proton scattering at the new MESA facility in Mainz is planned to provide a high-precision measurement of the parity-violating polarisation asymmetry. This experiment is expected to lead to a precision determination of the weak mixing angle, competitive with Z-pole data. We discuss the challenges for theory to derive predictions with the required accuracy.