Tensor Charges and their Impact on Physics Beyond the Standard Model

TL;DR

This paper reports lattice QCD calculations of the nucleon tensor charge, $g_T$, which is crucial for understanding potential new physics beyond the Standard Model, including tensor interactions and quark EDM contributions.

Contribution

The study introduces a systematic lattice QCD approach using flavor symmetry breaking and multiple lattice spacings to accurately determine the nucleon tensor charge.

Findings

Calculated $g_T$ values with controlled systematic uncertainties.

Provides input for constraining BSM tensor interactions.

Enhances understanding of nucleon structure relevant to EDM experiments.

Abstract

The nucleon tensor charge, $g_T$, is an important quantity in the search for beyond the Standard Model tensor interactions in neutron and nuclear $\beta$-decays as well as the contribution of the quark electric dipole moment (EDM) to the neutron EDM. We present results from the QCDSF/UKQCD/CSSM collaboration for the tensor charge, $g_T$, using lattice QCD methods and the Feynman-Hellmann theorem. We use a flavour symmetry breaking method to systematically approach the physical quark mass using ensembles that span three lattice spacings.