Second-order mass-breaking effects on hadron masses

SU(4) second-order mass-breaking effects on charmed hadron masses are studied in a dynamical consideration. We consider the process $S+B\to B+S$ in the $s$, $t$, and $u$ channels, where $S$ is the first-order symmetry-breaking spurion. Assuming that the nonexotic intermediate states dominate, several mass sum rules are obtained. Charmed isomultiplet masses are also estimated.