Multiplicity dependent studies for strangeness production with ALICE Meenakshi Sharma for the ALICE Collaboration1

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Multiplicity dependent studies for strangeness production with

ALICE

Meenakshi Sharma (for the ALICE Collaboration)1∗

1Department of Physics, University of Jammu, INDIA

Introduction

The ALICE experiment has studied

strangeness production in diﬀerent collision

systems (pp, p−Pb, Xe−Xe and Pb−Pb)

and energies. Figure 1 shows the ratio of

the strange particle yield to pion yield as a

function of multiplicity for diﬀerent collision

energies and systems. The ratios follow a con-

tinuously increasing trend (“enhancement”)

from low multiplicity pp to high-multiplicity

Pb−Pb collisions, independent of the initial

collision energy and colliding particles. It

is also observed that the enhancement is

larger for the particles with larger strangeness

content.

Several other features that were observed in

large collision systems and explained as due to

collective phenomena related to the formation

of the Quark Gluon Plasma (QGP) are also

observed in small systems [1]. This includes

the enhancement of Λ/K0

Syield ratios at in-

termediate pT, the evolution of the particle pT

spectra with multiplicity towards higher mul-

tiplicity. These unexpected results have mo-

tivated to perform further studies using the

ALICE detector for understanding the mech-

anisms responsible for such behaviour in small

systems.

Analysis Details

In ALICE, the strange hadrons K0

Sand Λ

are reconstructed from their decay particles

in the central pseudorapidity region, exploit-

ing the displaced vertex topology induced by

∗Electronic address: meenakshi.sharma@cern.ch

ALI-PREL-321075

FIG. 1: Ratio of hadron yields to pion yields

in diﬀerent collision systems at diﬀerent collision

energies.

the weak decay. The sub-detectors involved

in the analyses presented here include the In-

ner Tracking System (ITS) and the Time Pro-

jection Chamber (TPC) which are used for

charged particle tracking and identiﬁcation.

The multiplicity intervals are deﬁned based

on the signal amplitude measured in the V0A

scintillator. A detailed description of the AL-

ICE detector can be found in [2].

Results

The measurements of K0

S(Λ) are performed

in the rapidity range −0.5< y < 0 over the

pTranges 0.2 (0.6) < pT<10 GeV/c. The

yield per unit of rapidity, dN/dy, is obtained

by integrating the measured pTspectrum and

estimating the yield in the unmeasured region

using a Levy-Tsallis ﬁt function. Figure 2

shows the pTspectra for Λ in p–Pb collisions

at √sNN= 8.16 TeV, in diﬀerent V0A multi-

plicity classes along with their ratios to the

corresponding spectrum in minimum bias col-

arXiv:2210.11863v1 [nucl-ex] 21 Oct 2022

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MultiplicitydependentstudiesforstrangenessproductionwithALICEMeenakshiSharma(fortheALICECollaboration)11DepartmentofPhysics,UniversityofJammu,INDIAIntroductionTheALICEexperimenthasstudiedstrangenessproductionindierentcollisionsystems(pp,pPb,XeXeandPbPb)andenergies.Figure1showstheratioofthestrangep...

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Multiplicity dependent studies for strangeness production with ALICE Meenakshi Sharma for the ALICE Collaboration1

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