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I am just working through Zee's Quantum field theory in a nutshell and have a little problem. He calculates the free propagator and evaluates an integral (I doubt the integral is important for my question) when he writes "and the square root cut starting at \pm i*m leads to an exponential decay [...]". I don't really know what he means. I am german so maybe that's a problem too ;). What does he mean by "square root cut"? At google I just found some scientific papers...

Hope somebody can help me! Thanks in advance!!

Blue2script