Probing TeV scale physics via ultra cold neutron decays and calculating non-standard baryon matrix elements

TL;DR

This paper explores how precision neutron decay measurements can reveal new physics beyond the Standard Model at the TeV scale, emphasizing the importance of accurate matrix element calculations and combining experimental and theoretical approaches.

Contribution

It presents high-precision lattice QCD calculations of neutron to proton matrix elements and integrates effective field theory analyses with experimental and collider data to constrain new scalar and tensor interactions.

Findings

Lattice QCD results for baryon matrix elements with high precision.

Model-independent bounds on scalar and tensor interactions from combined data.

Constraints derived from low energy experiments and LHC collider data.

Abstract

We motivate undertaking precision analyses of neutron decays to look for signatures of new scalar and tensor interactions that can arise in extensions of the Standard Model at the TeV scale. The key ingrediant needed to connect experimental data with theoretical analysis are high-precision calculations of matrix elements of isovector bilinear operators between the decaying neutron and final state proton. We describe the status of our Lattice QCD program of using valence clover fermions on dynamical N_f=2+1+1 HISQ configurations generated by the MILC Collaboration. On the theoretical side we use the effective field theory method and provide both model independent and dependent analyses to obtain bounds on possible scalar and tensor interactions, both from low energy experiments and LHC data.