 Delta baryon

The Delta baryon ground multiplet is a short-lived baryon resonance family with isospin $3/2$ and spin-parity $3/2^{+}$. Its four charge states have ordinary valence contents $uuu$, $uud$, $udd$ and $ddd$, with charges $+2,+1,0,-1$ in elementary-charge units.

The familiar Delta-plus baryon and the proton share valence flavor content but differ in their spin coupling and mass. Strong decay into a nucleon and a pion gives the Delta resonance a broad decay width. In scattering, a resonance appears through an energy-dependent amplitude and cross section, not as an indefinitely stable additional constituent of every atomic nucleus.^[ref]