The quark contents of the nucleon and their implication for dark matter search

TL;DR

This paper investigates the quark composition of the nucleon using advanced lattice QCD techniques, providing key insights into nucleon mass origins and implications for dark matter detection.

Contribution

It offers new lattice QCD calculations of nucleon sigma terms with systematic uncertainty analysis, enhancing understanding of nucleon structure relevant to dark matter searches.

Findings

Sigma_pi_N = 37(2.6)(24.7) MeV

Sigma_s = 28(8)(10) MeV

y_N = 0.135(46)

Abstract

We present results concerning the light and strange quark contents of the nucleon using $N_f=2+1+1$ flavours of maximally twisted mass fermions. The corresponding $\sigma$-terms are casting light on the origin of the nucleon mass and their values are important to interpret experimental data from direct dark matter searches. We discuss our strategy to estimate systematic uncertainties arising in our computations. Our preliminary results for the $\sigma-$terms read $\sigma_{\pi N} = 37(2.6)(24.7) \mev$ and $\sigma_s=28(8)(10) \mev$. We present our recent final analysis of the $y_N$ parameter and found $y_N=0.135(46)$ including systematics\cite{Alexandrou:2013nda}.