Speaker
Description
We present our work on the computation of the axial form factor of the nucleon 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 $0.05\,\text{fm}$ to $0.086\,\text{fm}$ and pion masses spanning between $130\,\text{MeV}$ and $350\,\text{MeV}$. To control excited-state effects, we employ multiple source–sink separations in combination with the summation method. The $Q^2$-dependence of the form factors is parametrized using the $z$-expansion, and we perform simultaneous fits of all available source–sink separations for $Q^2\leq 0.7 \,{\rm GeV}^2$. We summarize the results of the isovector and isoscalar octet form factors and report on ongoing work towards the isoscalar singlet channel and the full flavor decomposition, with particular focus on the strange-quark contribution.
| Parallel Session (for talks only) | Structure of hadrons and nuclei |
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