# renormalization and factorization scale

Asked by
Yingjie Wei

Dear Madgraph experts,

I am sorry to ask about this technique question but I couldn't find the answer anywhere: why do we set the renormalization and factorization scale as 1/2 and 2 to get the +/- "1 sigma" (correct me if I was wrong) uncertainties from the scale, instead of 1/4 and 4, or 1/3 and 3? Is there some reference on this?

Many thanks,

Yingjie

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