Triangle and box diagrams in coupled-channel systems from the chiral Lagrangian

Isken, Tobias; Guo, Xiao-Yu; Heo, Yonggoo; Korpa, Csaba L.; Lutz, Matthias F. M.

doi:10.1103/physrevd.109.034032

Phys. Rev. D

2024

DOI: 10.1103/physrevd.109.034032

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Triangle and box diagrams in coupled-channel systems from the chiral Lagrangian

Tobias Isken,

Xiao-Yu Guo,

Yonggoo Heo

et al.

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How much strangeness is needed for the axial-vector form factor of the nucleon?

Hermsen,

Isken,

Lutz

et al. 2024

Phys. Rev. D

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We consider the axial-vector together with its induced pseudoscalar form factor of the nucleon as computed from the chiral Lagrangian with nucleon and isobar degrees of freedom. The form factors are evaluated at the one-loop level, where particular emphasis is put on the use of on-shell masses in the loop expressions. Our results are presented in terms of a novel set of basis functions that generalize the Passarino-Veltman scheme to the case where power-counting violating structures are to be subtracted. The particularly important role of the isobar degrees of freedom is emphasized. We obtain a significant and simultaneous fit to the available lattice QCD results based on flavor SU(2) ensembles for the baryon masses and form factors up to pion masses of about 500 MeV. Our fit includes sizeable finite volume effects that are implied by using in-box values for the hadron masses entering our one-loop expressions. We conclude that from flavor SU(2) ensembles it appears not possible to predict the empirical form factor at the desired precision. Effects from strange quarks are expected to remedy the situation. Published by the American Physical Society 2024

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How much strangeness is needed for the axial-vector form factor of the nucleon?

Hermsen,

Isken,

Lutz

et al. 2024

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

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Triangle and box diagrams in coupled-channel systems from the chiral Lagrangian

Cited by 1 publication

References 66 publications

How much strangeness is needed for the axial-vector form factor of the nucleon?

How much strangeness is needed for the axial-vector form factor of the nucleon?

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