 CPT constraints on particle properties

In a CPT-invariant vacuum, a subatomic particle and its antiparticle have equal masses and total decay widths, equal spin magnitudes and opposite conserved additive charges. CPT exchanges initial and final states in a scattering experiment; it relates a process to the reversed process with antiparticles and reversed spins. It does not force equality of every pair of conjugate partial decay widths when CP violation is present.