Study of the PYTHIA $\Delta\eta\Delta\phi$ correlation as a function of multiplicity and transverse sphericity in proton-proton collisions at 7 TeV

TL;DR

This paper investigates how $ riangle ext{eta} riangle ext{phi}$ correlations in proton-proton collisions at 7 TeV vary with event multiplicity and sphericity, highlighting the importance of binning data for detailed analysis.

Contribution

It introduces a detailed analysis of correlation shapes as functions of multiplicity and sphericity, emphasizing the role of color reconnection in the observed patterns.

Findings

Correlation shapes vary significantly with sphericity and multiplicity.

Color reconnection influences the radial flow patterns in the correlations.

Data binning in multiple observables is crucial for understanding collision dynamics.

Abstract

The study and understanding of the details of proton-proton collisions is important since they are the benchmark for the comparison with heavy ion results. In the present work we have studied the $\Delta\eta\Delta\phi$ correlations as a function of the event multiplicity and transverse sphericity in pp collisions at $\sqrt{s}$ = 7 TeV using PYTHIA 8.180. The results show large variation in the shape of the correlation as a function of the sphericity and multiplicity indicating the importance of slicing the data in bins of both observables to better understand the complexity of the interactions. Motivated by the radial flow patterns originated by color reconnection (CR), results with and without CR together with dihadron correlations are discussed.