Signed Mahonian polynomials for major and sorting indices

Abstract

We derive some new signed Mahonian polynomials over the complex reflection group $G(r,1,n)=C_r\wr {\mathfrak{S}}_n$, where the "sign" is taken to be any of the $2r$ $1$-dim characters and the "Mahonian" statistics are the $\mathsf{lmaj}$ defined by Bagno and the $\mathsf{sor}$ defined by Eu et al. Various new signed Mahonian polynomials over Coxeter groups of types $B_n$ and $D_n$ are derived as well. We also investigate the signed counting polynomials on $G(r,1,n)$ for those statistics with the distribution $[r{]}_q[2r{]}_q\cdots [nr{]}_q$.

22 pages, 1 figure