Abstract

The Bose-Einstein correlations provide a unique opportunity for detailed understanding of space-time characteristics of the hadronization region, for determining the size and shape of the source from which particles are emitted and for interpreting quark confinement effects. The correlations lead to enhancement in production of identical bosons that are close in phase space. The ATLAS collaboration has performed a measurement of Bose-Einstein correlations of pairs of charged particles with transverse momentum greater than 100 MeV in p-p collisions at 900 GeV and 7 TeV. Bose-Einstein correlation parameters are investigated up to very high chargedparticle multiplicities. The dependence of the Bose-Einstein correlation parameters on the average transverse momentum per pair is also investigated.

Highlights

  • Bose-Einstein correlations (BEC) are a well-known phenomenon in high-energy and nuclear physics

  • Studies of the BEC dependence on particle multiplicity and transverse momentum are of special interest

  • The following corrections were taken into account in our analysis: - the trigger efficiency, εtrig(n), - the vertex reconstruction efficiency, εvert (n), - unfolding to particle level, - pile-up effect fraction for high multiplicity events, - the track reconstruction efficiency, ε, - the fraction of secondary particles, fsec(pt,η), - the fraction of selected tracks for which the corresponding primary particles are outside the kinematic range, fokr(pt,η), - the fake tracks, ffake(pt,η)

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Summary

1.Introduction

Bose-Einstein correlations (BEC) are a well-known phenomenon in high-energy and nuclear physics. This effect, as a consequence of symmetry of identical boson wave function, can describe the interference of identical bosons emitted from a localized source. They represent a sensitive probe of the space-time characteristics of the hadronization region and allow the determination of the size and shape of the source from which particles are emitted [1]. Studies of the BEC dependence on particle multiplicity and transverse momentum are of special interest. They help to understand the multiparticle production mechanism. This can be understood as arising from the increase in the initial geometrical region of overlap of the colliding objects, a large overlap implying a large multiplicity

Bose-Einstein correlations
Two particle correlation function
Data and MC samples
Applied corrections
Results
Multiplicity dependence
The kT dependence
Conclusion
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