Electric form factors of the octet baryons from lattice QCD and chiral extrapolation
| Autor: | Shanahan, P. E., Horsley, R., CSSM and QCDSF/UKQCD Collaborations, Nakamura, Y., Pleiter, D., Rakow, P. E. L., Schierholz, G., Stüben, H., Thomas, A. W., Young, R. D., Zanotti, J. M. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Nuclear and High Energy Physics
electric [form factor] Nuclear Theory clover [fermion] High Energy Physics::Lattice FOS: Physical sciences chiral [perturbation theory] Wilson [quark] form factor [nucleon] correction: finite size fermion: clover finite size [correction] Nuclear Theory (nucl-th) heavy [baryon] quark: flavor: 3 High Energy Physics - Lattice High Energy Physics - Phenomenology (hep-ph) Dirac [form factor] quantum chromodynamics form factor: Dirac ddc:530 chiral [baryon] quark: mass dependence Nuclear Experiment numerical calculations nucleon: form factor lattice form factor: magnetic High Energy Physics - Lattice (hep-lat) High Energy Physics::Phenomenology lattice field theory flavor: 3 [quark] form factor: electric perturbation theory: chiral baryon: heavy mass dependence [quark] regularization High Energy Physics - Phenomenology magnetic [form factor] baryon: chiral baryon: octet quark: Wilson octet [baryon] experimental results |
| Zdroj: | Physical review / D 90(3), 034502 (2014). doi:10.1103/PhysRevD.90.034502 |
| DOI: | 10.1103/PhysRevD.90.034502 |
| Popis: | Physical review / D 90(3), 034502 (2014). doi:10.1103/PhysRevD.90.034502 We apply a formalism inspired by heavy-baryon chiral perturbation theory with finite-range regularization to dynamical $2+1$-flavor CSSM/QCDSF/UKQCD Collaboration lattice QCD simulation results for the electric form factors of the octet baryons. The electric form factor of each octet baryon is extrapolated to the physical pseudoscalar masses, after finite-volume corrections have been applied, at six fixed values of ${Q}^{2}$ in the range $0.2–1.3\text{}\text{}{\mathrm{GeV}}^{2}$. The extrapolated lattice results accurately reproduce the experimental form factors of the nucleon at the physical point, indicating that omitted disconnected quark loop contributions are small relative to the uncertainties of the calculation. Furthermore, using the results of a recent lattice study of the magnetic form factors, we determine the ratio ${\mu }_{p}{G}_{E}^{p}/{G}_{M}^{p}$. This quantity decreases with ${Q}^{2}$ in a way qualitatively consistent with recent experimental results. Published by Soc., [S.l.] |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|