A group theoretic characterization of Buekenhout–Metz unitals in PG(2,q2) containing conics

Let UU be a unital in PG(2,q2), q=phq=ph and let GG be the group of projectivities of PG(2,q2) stabilizing UU. In this paper we prove that UU is a Buekenhout–Metz unital containing conics and qq is odd if, and only if, there exists a point AA of UU such that the stabilizer of AA in GG contains an elementary Abelian pp-group of order q2q2 with no non-identity elations.