... conser-vation laws would follow automatically in the standard model if the neutrinosare massless. Recently, however, evidence for tiny nonzero neutrino masses andsubtle violation of these conservations ... satisfying (30). In relativistic quantum mechanicsconservation laws must be local, so the conservation lawdIidt= 0 (32)really follows from the local conservation law∂∂xµIµi(x) = 0 (33)ELEMENTARY PARTICLES ... resonances)extremely short-lived. The degree of stability depends mainly on the mass ofthe hadron. If its mass lies above the threshold for an allowed decay channel,it will decay rapidly; if it does...