Probing novel long-range correlation phenomena in pPb collisions with identified particles at CMS

Zhenyu Chen

doi:10.1088/1742-6596/612/1/012016

Abstract

Observation of a long-range near-side two-particle correlation (known as the ”Ridge”) in high-multiplicity pp and pPb collisions opened up new opportunities of exploring novel QCD dynamics in small collision systems. To further investigate the origin of this phenomenon, studies of two-particle correlations with identified K0s and trigger particles in 5.02 TeV pPb collisions are presented, and compared to PbPb collisions over a similar multiplicity range. The K0s and are cleanly reconstructed via their secondary decay vertices over a wide pseudorapidity and transverse momentum range. The second-order anisotropy harmonics (v2) of K0s and are extracted from long-range correlations as a function of particle multiplicity and pT. The wide pT coverage and rich sample of high multiplicity pPb events allow: (1) a precise examination of the mass ordering effect of vn at low pT as predicted by hydrodynamics for a collectively expanding medium; (2) exploration of possible constituent quark number scaling of v2 between mesons and baryons as was observed in high-energy nucleus- nucleus collisions.

Highlights

Studies of multiparticle correlations provide important insights into the underlying mechanism of particle production in high-energy collisions of both protons and nuclei
Observation of a long-range near-side two-particle correlation in high-multiplicity pp and pPb collisions opened up new opportunities of exploring novel QCD dynamics in small collision systems
The second-order (v2) anisotropy harmonics of Ks0 and Λ/Λ are extracted from long-range correlations as a function of particle multiplicity and pT

Summary

Introduction

Studies of multiparticle correlations provide important insights into the underlying mechanism of particle production in high-energy collisions of both protons and nuclei. Probing novel long-range correlation phenomena in pPb collisions with identified particles at CMS To further investigate the origin of this phenomenon, studies of two-particle correlations with identified Ks0 and Λ/Λ trigger particles in 5.02 TeV pPb collisions are presented, and compared to PbPb collisions over a similar multiplicity range.

Results

Conclusion