The isoscalar non-singlet axial form factor of the nucleon from lattice QCD

2025/02/10 by Alessandro Barone, Dalibor Djukanovic, Barone, Alessandro +11
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #Nuclear physics research studies

paper · pdf · doi:10.48550/arxiv.2502.06305

Abstract

We present our progress on the computation of the axial form factor of the nucleon with flavour structure u+d-2s from lattice QCD. We employ a set of N_f=2+1 CLS ensembles with O(a)-improved Wilson fermions and the Lüscher-Weisz gauge action, with lattice spacings ranging from 0.05 fm to 0.086 fm and pion masses spanning between 130 MeV and 350 MeV. We employ multiple source-sink separations and use the summation method to suppress the contamination from excited states. We use a z-expansion on each ensemble to parametrize the Q²-dependence of the form factor and simultaneously fit the available source-sink separations for all Q²≤ 0.7 \rm GeV². We outline our analysis of the stability of the fits varying the ansätze and different estimations of the covariance matrix and report on our strategy for a comprehensive determination of the physical form factor.

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