Multiparton Interactions in pp collisions from Machine Learning

Abstract

Over the last years, Machine Learning (ML) tools have been successfully applied to a wealth of problems in high-energy physics. In this work, we discuss the extraction of the average number of Multiparton Interactions ($⟨N_{\mathrm{mpi}}⟩$) from minimum-bias pp data at LHC energies using ML methods. Using the available ALICE data on transverse momentum spectra as a function of multiplicity, we report that for minimum-bias pp collisions at $\sqrt{s}=$ 7 TeV the average $N_{\mathrm{mpi}}$ is 3.98 $\pm$ 1.01, which complements our previous results for pp collisions at $\sqrt{s}=$ 5.02 and 13 TeV. The comparisons indicate a modest energy dependence of $⟨N_{\mathrm{mpi}}⟩$. We also report the multiplicity dependence of $N_{\mathrm{mpi}}$ for the three center-of-mass energies. These results are qualitatively consistent with the existing ALICE measurements sensitives to MPI, therefore they provide additional experimental evidence of the presence of MPI in pp collisions.

Comments: Proceedings for the poster session given at LHCP 2021