Abstract

Short-range correlations of identified charged hadrons in pp ( s = 0.9, 2.76, and 7 TeV), pPb ( s NN = 5.02 TeV), and peripheral PbPb collisions ( s NN = 2.76 TeV) are studied with the CMS detector at the LHC. Charged pions, kaons, and protons at low momentum and in laboratory pseudorapidity | η | < 1 are identified via their energy loss in the silicon tracker. The two-particle correlation functions show effects of quantum statistics, Coulomb interaction, and also indicate the role of multi-body resonance decays and mini-jets. The characteristics of the one-, two-, and three-dimensional correlation functions are studied as a function of transverse pair momentum, k T , and the charged-particle multiplicity of the event. The extracted radii are in the range 1–5 fm, reaching highest values for very high multiplicity pPb, also for similar multiplicity PbPb collisions, and decrease with increasing k T . The dependence of radii on multiplicity and k T largely factorizes and appears to be insensitive to the type of the colliding system and center-of-mass energy.

Highlights

  • Measurements of the correlation between hadrons emitted in high-energy collisions of nucleons and nuclei can be used to study the spatial extent and shape of the created system

  • Collaboration [2,3] using unidentified charged hadrons produced in s = 0.9, 2.36, and 7 TeV pp collisions

  • Our aim was to look for effects present in pp, pPb, and PbPb interactions using the same analysis methods, producing results as a function of the transverse pair momentum kT and of the fully corrected charged-particle multiplicity Ntracks of the event

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Summary

Introduction

Measurements of the correlation between hadrons emitted in high-energy collisions of nucleons and nuclei can be used to study the spatial extent and shape of the created system. Collaboration [2,3] using unidentified charged hadrons produced in s = 0.9, 2.36, and 7 TeV pp collisions. Those studies only included one-dimensional fits (qinv ) of the correlation function. The ALICE, PHENIX, and STAR collaborations have published numerous interesting results on the Bose–Einstein and other femtoscopic (multidimensional) correlations of identified charged hadrons: charged pions [4,5] and kaons [6,7] in diverse energy pp, AuAu, and PbPb collisions. All details of the analysis are given in Ref. [8]

Data Analysis
Correlations
Coulomb Interaction
Clusters
Results
Conclusions

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