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Q: Problem with Mellin Barnes type integral

marioUsing the Mellin Barnes technique for a certain Feynman integral, I arrive at $$ I= \frac1{2\pi i} \int\limits_{-i\infty}^{i\infty} dz\; \Gamma^4\left(\frac12 + z\right) \Gamma^4\left(\frac12 - z\right) \psi\left(\frac12 - z\right)\,, $$ where $\psi(x)$ is the digamma-function. This i...

 

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