Model studies of V0 production ratios in $pp$ collisions at $\sqrt{\mathrm{s}}$ = 0.2, 0.9, and 7 TeV

TL;DR

This study compares different event generator models' predictions of V0 particle ratios in proton-proton collisions at various energies, highlighting their limitations and potential for tuning to better match experimental data.

Contribution

It provides a systematic comparison of HIJING, Sibyll, and QGSJET models against experimental data for V0 ratios at multiple energies, identifying areas for model improvement.

Findings

QGSJET predicts most ratios well but lacks Xi particle modeling.

None of the models fully reproduce experimental results across all regions.

Systematic comparisons can guide model tuning for better future predictions.

Abstract

A comparative study of $V^0$ ratios has been performed between HIJING, Sibyll and QGSJET model-based event generators in this paper. The ratios under study are {\alam}/{\lam}, {\alam}/{\ks} and {\xim}/{\lam} as a function of rapidity $y$, rapidity loss ($\Delta y$) and {\ppt} from $pp$ collisions at \sqrts~= 0.2, 0.9, and 7 TeV and these simulations are then compared with the STAR and LHCb fiducial phase spaces in different {\ppt} regions. Although the models could produce some of the ratios in a limited {\ppt} and/or $y$ region, none of them completely predicts the experimental results. The QGSJET has good predictions with the data in most of the cases but since the model does not include the $\Xi$ particle definition, therefore it does not give any predictions for $\Xi$/{\lam} ratios. The extrapolation to the highest possible energies can be studied by re-tune some of the basic parameters based on current and previous measurements. These kinds of systematic comparison studies are also useful to apply certain constraints on the pQCD and non-pQCD-based hadronic event generators to significantly improve the predictions of Standard Model physics at the RHIC and LHC experimental data for the understanding of underlying physics mechanisms in high energy collisions.