Light-quark contributions to the magnetic form factor of the Lambda(1405)

Abstract

In a recent study of the Lambda(1405), the suppression of the strange-quark contribution to the magnetic form factor was interpreted as the discovery of a dominant antikaon-nucleon composition for this low-lying state. We confirm this result by calculating the light u- and d-quark contributions to the Lambda(1405) magnetic form factor in lattice QCD in order to determine the extent to which their contributions support this exotic molecular description. Drawing on the recent graded-symmetry approach for the flavor-singlet components of the Lambda(1405), the separation of connected and disconnected contributions is performed in both the flavor-octet and singlet representations. The relationship between light-quark contributions to the Lambda(1405) magnetic form factor and the connected contributions of the nucleon magnetic form factors is established and compared with lattice calculations of the same quantities, confirming the KN molecular structure of the Lambda(1405) in lattice QCD.

References in corpus (10)

• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• New insights into antikaon-nucleon scattering and the structure of the Lambda(1405)
• Pion-nucleon scattering in the Roper channel from lattice QCD
• Electromagnetic and spin polarisabilities in lattice QCD
• Structure of the $\mathbf{\Lambda }(1405)$ from Hamiltonian effective field theory
• Hamiltonian effective field theory study of the ${\mathbf{N}}^{\ast }(1440)$ resonance in lattice QCD
• A novel analysis method for excited states in lattice QCD - the nucleon case
• Strange Quark Magnetic Moment of the Nucleon at Physical Point
• The radiative decay of the $\Lambda (1405)$ and its two-pole structure

Cited by in corpus (14)

• Review of the $\mathbf{\Lambda }$(1405): A curious case of a strange-ness resonance
• Structure of the Roper Resonance from Lattice QCD Constraints
• Hyperon resonances coupled to pseudoscalar- and vector-baryon channels
• S- and p-wave structure of $S=-1$ meson-baryon scattering in the resonance region
• Elastic Form Factors of Nucleon Excitations in Lattice QCD
• New insights into the pole parameters of the $\Lambda (1380)$, the $\Lambda (1405)$ and the $\Sigma (1385)$
• Charm-baryon semileptonic decays and the strange ${\Lambda }^{\ast }$ resonances: New insights from lattice QCD
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Pole trajectories of the $\Lambda (1405)$ helps establish its dynamical nature
• Magnetic moment of the ${\Xi }_b(6227)$ as a molecular pentaquark state
• Reflections on Chiral Symmetry within QCD
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• Exotic properties of N^*(1895) and its impact on photoproduction of light hyperons
• Form factors of the $\rho$ meson from effective field theory and the lattice