A Composite Axion from a Supersymmetric Product Group

Benjamin Lillard, Tim M. P. Tait

A global $U(1{)}_{\text{PQ}}$ symmetry is protected from gravitational effects in the s-confining $SU(N{)}^k$ product group theory with $A+4Q+N\overline{Q}$ matter. If the $SU(4)$ famil…