Name: Rolf Mertig (email_not_shown)
Date: 05/12/13-12:04:04 AM Z

$LimitTo4 = False

before invoking OneLoop.

Alternatively you can use

OneLoopSimplify[den*SP[q, q]^2, q]
and then OneLoop or just do the integrals by hand.

Taking the limit to 4 can be tricky in the Passarino-Veltman scheme and it is easy to do mistakes (by hand or by computer)


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