Regular Sylow $d$-Tori of classical groups and the McKay conjecture

Abstract

We prove for finite reductive groups $G$ of classical type, that every irreducible character of $L$ extends to its inertia group in $N$, where $L$ is an abelian centraliser of a Sylow $d$-torus $\mathbf{S}$ of $G$ and $N:=N_G(\mathbf{S})$. This gives a precise description of the irreducible characters of $N$. Furthermore it enables us to verify the McKay conjecture in this situation for $G$ and some primes.