Estimating event-by-event multiplicity by a Machine Learning Method for Hadronization Studies

Abstract

Hadronization is a non-perturbative process, which theoretical description can not be deduced from first principles. Modeling hadron formation requires several assumptions and various phenomenological approaches. Utilizing state-of-the-art Deep Learning algorithms, it is eventually possible to train neural networks to learn non-linear and non-perturbative features of the physical processes. In this study, the prediction results of three trained ResNet networks are presented, by investigating charged particle multiplicities at event-by-event level. The widely used Lund string fragmentation model is applied as a training-baseline at $\sqrt{s}=7$ TeV proton-proton collisions. We found that neural-networks with $\gtrsim \mathcal{O}(10^3)$ parameters can predict the event-by-event charged hadron multiplicity values up to $N_{\mathrm{ch}}\lesssim 90$.

Comments: 11 pages, 5 figures, proceedings of the 23rd Zimanyi School Winter Workshop on Heavy Ion Physics, Budapest, Hungary, December 4 - 8, 2023, submitted to the International Journal of Modern Physics A, special issue "Zimanyi School 2023"