On the formal degrees of square-integrable representations of odd   special orthogonal and metaplectic groups
  The formal degree conjecture relates the formal degree of an irreducible square-integrable representation of a reductive group over a local field to the special value of the adjoint $\gamma$-factor of its $L$-parameter. In this paper, we prove the formal degree conjecture for odd special orthogonal and metaplectic groups in the generic case, which combined with Arthur's work on the local Langlands correspondence implies the conjecture in full generality. 
Atsushi Ichino, Erez Lapid, Zhengyu Mao
math.NT math.RT