Published online by Cambridge University Press: 20 November 2018
Let $\Pi$ be a generic cuspidal automorphic representation of
$\text{GSp}\left( 2 \right)$ defined over a totally real algebraic number field
$\text{k}$ whose archimedean type is either a (limit of) large discrete series representation or a certain principal series representation. Through explicit computation of archimedean local zeta integrals, we prove the functional equation of tensor product
$L$-functions
$L\left( s,\Pi \times \sigma \right)$ for an arbitrary cuspidal automorphic representation
$\sigma $ of
$\text{GL}\left( 2 \right)$. We also give an application to the spinor
$L$-function of
$\Pi$.