Speaker
Description
In this talk, we present the results of a recent investigation on the behavior of the charge distributions of the $\Delta$ baryon,both unpolarized and transversely polarized, as a function of longitudinal momentum ($P_z$) in a Wigner phase-space perspective. Specifically, we examine how the charge distributions change as $P_z$ increases from 0 to $\infty$. We find that the charge distribution of a longitudinally polarized $\Delta$ baryon remains spherically symmetric regardless of $P_z$. On the other hand, for a transversely polarized $\Delta$ baryon along the $x$-axis, a quadrupole contribution emerges at rest ($P_z=0$), and as $P_z$ increases, electric dipole and octupole moments are induced. The current analysis reveals that the induced dipole moment dominates over higher multipole contributions and drives the deformation of the $\Delta$ baryon's charge distribution. These findings provide insights into the underlying physics of the $\Delta$ baryon and its charge structure.
