  This paper is concerned with multivariate refinements of the gamma-positivity
of Eulerian polynomials by using the succession and fixed point statistics.
Properties of the enumerative polynomials for permutations, signed permutations
and derangements, including generating functions and gamma-positivity are
studied, which generalize and unify earlier results of Athanasiadis, Brenti,
Chow, Petersen, Roselle, Stembridge, Shin and Zeng. In particular, we derive a
formula expressing the joint distribution of excedance number and negative
number statistics over the type B derangements in terms of the derangement
polynomials.
