Abstract: Multi-parton distributions in a proton, the nonperturbative 
quantities needed to make predictions for multiple scattering rates, are 
poorly constrained from theory and data and must be modelled. All Monte 
Carlo event generators that simulate multiple parton interactions (e.g. 
Pythia) contain such a model of multi-parton PDFs. One important 
theoretical constraint for the case of double parton distributions is 
provided by the so-called number and momentum sum rules. In this talk I 
will give a brief overview of existing models of multi-parton PDFs and 
discuss to what extent the double parton distribution functions used in 
the Pythia event generator obey these sum rules. Additionally I will 
also  consider the number and momentum sum rules for the triple parton 
distribution functions and discuss how one can use the Pythia code to 
construct triple parton distribution functions which approximately 
satisfy these sum rules.

Per connettersi a zoom:
Topic: Theory and Pheno seminars
https://infn-it.zoom.us/j/8573185271
Meeting ID: 857 318 5271