Nucleon and $N^* (1535)$ Distribution Amplitudes

TL;DR

This paper reports on lattice QCD calculations of the distribution amplitudes and wavefunction normalization constants for the nucleon and its parity partner, the $N^* (1535)$, using improved Wilson fermions and new data at lower pion masses.

Contribution

It presents new lattice QCD results for distribution amplitudes of nucleon and $N^* (1535)$ with reduced errors at near-physical pion masses.

Findings

Improved accuracy in distribution amplitude calculations.

Successful extrapolation to physical pion mass.

Enhanced understanding of nucleon and $N^* (1535)$ structures.

Abstract

The QCDSF collaboration has investigated the distribution amplitudes and wavefunction normalization constants of the nucleon and its parity partner, the $N^* (1535)$. We report on recent progress in the calculation of these quantities on configurations with two dynamical flavors of $\mathcal{O}(a)$-improved Wilson fermions. New data at pion masses of approximately 270 MeV helps in significantly reducing errors in the extrapolation to the physical point.