Hi, I am recently working on a project involving simulations and I'm pretty confused about the parameter energy scale Q (contained in TruthEvent pdfInfo). I tried to figure out what that parameter means and from some sources online I think Q is the absolute value of momentum transfer q. Therefore, I'm a bit confused about how the value of Q is determined. There are a lot of interactions in one event and I guess that gives a different q, but as far as I know the Q is for per event, so how do they determine Q? I tried to find information from the class reference (http://hep.uchicago.edu/~kkrizka/rootcoreapis/d7/d81/classxAOD_1_1TruthEvent__v1.html) but can't really find much. Thanks!