The twisted symmetric square $L$-function of $GL(r)$

In this paper, we consider the (partial) symmetric square $L$-function $L^S(s,\pi ,Sy{m}^2\otimes \chi )$ of an irreducible cuspidal automorphic representation $\pi$ of ${\text{GL}}_r(\text{A})$ twisted by a Hecke character $\chi$. In particular, we will show that the $L$-function $L^S(s,\pi ,Sy{m}^2\otimes \chi )$ is holomorphic except at $s=0$ and $s=1$, and moreover the possible poles could occur only when ${\chi }^r{\omega }^2=1$, where $\omega$ is the central character of $\pi$. Our method of proof is essentially a (nontrivial) modification of the one by Bump and Ginzburg in which they considered the case $\chi =1$.