Nucleon axial and pseudoscalar form factors from lattice QCD at the physical point

We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the strange and charm quarks with their mass close to phys...

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Published inarXiv.org
Main Authors Alexandrou, C, Bacchio, S, Constantinou, M, Dimopoulos, P, Finkenrath, J, Hadjiyiannakou, K, Jansen, K, Koutsou, G, Kostrzewa, B, Leontiou, T, Urbach, C
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 26.11.2020
Subjects
Charm (particle physics)
Form factors
Nucleons
Physics - High Energy Physics - Lattice
Physics - High Energy Physics - Phenomenology
Physics - Nuclear Experiment
Physics - Nuclear Theory
Pions
Quantum chromodynamics
Quarks
Vector currents
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Summary:We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the strange and charm quarks with their mass close to physical. The latter ensemble has large statistics and finer lattice spacing and it is used to obtain final results, while the other two are used for assessing volume effects. The pseudoscalar form factor is also computed using these ensembles. We examine the momentum dependence of these form factors as well as relations based on pion pole dominance and the partially conserved axial-vector current hypothesis.
ISSN:2331-8422
DOI:10.48550/arxiv.2011.13342