Multiplicity distributions in the low x regime in a simple model

TL;DR

This paper examines modified versions of a particle production model to compare their predictions with LHC data, finding better agreement at higher transverse momentum and narrow pseudorapidity ranges.

Contribution

Introduces small modifications to existing models for multiplicity distributions and compares their predictions with recent experimental data from the LHC.

Findings

Good description of data in central pseudorapidity region

Improved agreement at higher transverse momentum

Discrepancies increase over wider pseudorapidity intervals

Abstract

In this work we introduce small changes in the model proposed by E. Levin and D. Kharzeev for multiplicity distributions of particles produced in proton-proton collisions. We compare the predictions of the model with the available experimental data from the LHC. We also consider the most recent version of the model proposed by E. Gotsman and E. Levin. These two versions of the model give a good description of the measured multiplicity distributions in the central pseudo-rapidity region ($|\eta| < 0.5$). The agreement with data is not so good when we consider the particles measured over a wider pseudo-rapidity interval ($|\eta| < 2.4$). Interestingly, the agreement becomes better when one selects events with higher transverse momentum ($p_T > 500$ MeV).