Abstract
The Pythia event generator is used in several contexts to study hadron and lepton interactions, notably mathrm{p}mathrm{p} and mathrm{p}{bar{mathrm{p}}} collisions. In this article we extend the hadronic modelling to encompass the collision of a wide range of hadrons h with either a proton or a neutron, or with a simplified model of nuclear matter. To this end we model hmathrm{p} total and partial cross sections as a function of energy, and introduce new parton distribution functions for a wide range of hadrons, as required for a proper modelling of multiparton interactions. The potential usefulness of the framework is illustrated by a simple study of the evolution of cosmic rays in the atmosphere, and by an even simpler one of shower evolution in a solid detector material. The new code will be made available for future applications.
Highlights
Throughout the history of high energy particle physics, one of the most studied processes is proton–proton collisions
Our simplified SU21 ansatz leads to a shift that is comparable to the difference between the two standard parton distribution functions (PDFs)
One of the assumptions made above was that the changes in total cross sections and in PDFs would match to some approximation, such that event properties would be comparable over the range of colliding hadrons
Summary
Throughout the history of high energy particle physics, one of the most studied processes is proton–proton collisions. A second new addition is low-energy interactions, which was developed as part of a framework for hadronic rescattering in Pythia [5,6] Excited baryons or charm/ bottom hadrons) use simplified descriptions, the most general being the Additive Quark Model (AQM) [7,8], which gives a cross section that depends only on the quark content of the involved hadrons. This way, the low-energy framework supports interactions for all possible hadron–hadron combinations.
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