Hello all Following the question I raised about the odd spectral shape of mX for gamma,p -> X,nucleon today during the talk by M. Dugger, I decided to look at this spectrum for myself to see if the bump at 3 GeV/c^2 was being produced by the parametric MC or if it was coming from Pythia. I added some plots to the wiki page for today's meeting. Please see the notes that I posted there for details. The question I end up asking is, does Pythia know about the rapidity gap in diffractive production? If not, we will need to take these kinds of mass distributions with a big grain of salt. http://www.jlab.org/Hall-D/software/wiki/index.php/April_27,_2009_(11AM),_Physics_Working_Group#Comment_on_Pythia_mass_distributions_-_R._Jones <http://www.jlab.org/Hall-D/software/wiki/index.php/April_27,_2009_%2811AM%29,_Physics_Working_Group#Comment_on_Pythia_mass_distributions_-_R._Jones> -Richard Jones
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