Speaker
Description
In this talk we will report a new underlying event tune for the PYTHIA 8 Monte Carlo event generator that is applicable for hadron collisions primarily at $\sqrt{s}$ ranges available at the Relativistic Heavy-Ion Collider (RHIC). This study is the first tuning exercise of the multi-parton interactions/underlying event parameters in PYTHIA 8 utilizing RHIC data at $\sqrt{s}$ = 200 GeV. We compare our new PYTHIA 8 tuned predictions to mid-rapidity inclusive $\pi^{\pm}$ spectra, jet sub-structure, Drell-Yan production, and underlying event observables from RHIC and the Tevatron, as well as underlying event data from the Large Hadron Collider. With respect to the default PYTHIA 8 Monash Tune, the new tune shows significant improvements in the description of the experimental data across all center-of-mass energies used in the tuning. Additionally, we explore the validity of PYTHIA 8 predictions for forward rapidity $\pi^{\pm}$ in $\sqrt{s}$ = 200 GeV collisions.
