Investigation of the energy dependence of the pT0 parameter in the Pythia 8 Monte Carlo event generator

TL;DR

This paper investigates how the pT0 parameter in Pythia 8 varies with energy, proposing an improved energy-dependent model to better match experimental data across a wide energy range.

Contribution

It introduces an additional energy-dependent term for pT0 in Pythia 8, enhancing the accuracy of multiparton interaction simulations across 0.3-13 TeV.

Findings

The new model better fits experimental data than previous power-law descriptions.

The energy dependence of pT0 is consistent across different parton density functions.

The improved parameterization extends the predictive power of Pythia 8.

Abstract

By using predictions from the Pythia 8 Monte Carlo event generator, we determine the energy-dependent turn-over values (pT0) of the partonic cross section for the simulation of multiparton interactions. Since the observed energy dependence of the pT0 values is not well described by a power-law function, we introduce an additional energy-dependent term, to better describe the experimental observations in the energy range sqrt(s) = 0.3-13 TeV. We obtain a similar level of agreement for predictions using various parton densities.