Abstract
We explore the structure of the spin-1/2 flavor-octet baryons (hyperons) through their electromagnetic transverse densities. The transverse densities describe the distribution of charge and magnetization at fixed light-front time and enable a spatial representation of the baryons as relativistic systems. At peripheral distances $$b \sim 1/M_\pi $$ the transverse densities are computed using a new method that combines chiral effective field theory ( $$\chi $$ EFT) and dispersion analysis. The peripheral isovector densities arise from two-pion exchange, which includes the $$\rho $$ resonance through elastic unitarity. The isoscalar densities are estimated from vector meson exchange ( $$\omega , \phi )$$ . We find that the “pion cloud” in the charged $$\varSigma $$ hyperons is comparable to the nucleon, while in the $$\varXi $$ it is suppressed. The $$\varLambda $$ – $$\varSigma ^0$$ transition density is pure isovector and represents a clear manifestation of peripheral two-pion dynamics.
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