Effect of rope hadronization on strangeness enhancement in p−p collisions at LHC energies

Ranjit Nayak,Sadhana Dash,Subhadip Pal

doi:10.1103/physrevd.100.074023

Abstract

The p$-$p collisions at high multiplicity at LHC show small scale collective effects similar to that observed in heavy ion collisions such as enhanced production of strange and multi-strange hadrons, long range azimuthal correlations, etc. The observation of strangeness enhancement in p$-$p collisions at at $\sqrt{s}$ = 7 TeV and 13 TeV as measured by ALICE experiment is explored using Pythia8 event generator within the framework of microscopic rope hadronization model which assumes the formation of ropes due to overlapping of strings in high multiplicity environment. The transverse momentum ($p_{T}$) spectra shape and its hardening with multiplicity is well described by the model. The mechanism of formation of ropes also described the observed experimental strangeness enhancement for higher multiplicity classes in p$-$p collisions at 7 TeV and 13 TeV. The enhancement with multiplicity is further investigated by studying the mean $p_{T}$ ($<p_{T}>$) and the integrated yields ($<dN/dy>$ ) of strange and multi-strange hadrons and comparing the predictions to the measured data at LHC for 7 TeV and 13 TeV.

Highlights

The strange recent observation of enhanced productiopnffiffi and multistrange hadrons in p-p collisions at s of 1⁄4ALICE experiment [1] and long range azimuthal correlations measured by CMS and ATLAS experiment [2,3,4]have generated a lot of interest in small systems
We study sions atthepsffisffitr1⁄4an7geTneeVss enhancement observed in p-p colliand 13 TeV using rope hadronization mechanism of PYTHIA8 [9,15] and compare with the ALICE
This study shows that the mechanism of rope hadronization within the framework of quantum chromodynamics (QCD)-based color reconnection model describes the essential features of strangeness enhancement in p-p collisions without assuming the formation of a thermalized plasma as predicted in Refs. [19,20]

Summary

Introduction

The strange recent observation of enhanced productiopnffiffi and multistrange hadrons in p-p collisions at s of 1⁄4. Have generated a lot of interest in small systems. These observations mimic features present in deconfined matter formed in heavy ion collisions and are manifestations of quark gluon plasma (QGP) dynamics. The QGP observables are studied as a function of charged particle density (dNch=dη) in smaller systems and the size of the effects seem to agree with heavy ion collisions for similar charged particle density. The possibility of formation of a mini-QGP in small systems for high multiplicity is being predicted [5]. An enhanced production of strange and multistrange hadrons in heavy ion collisions has long been predicted to be a signature of the formation of the QGP medium [6]

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