We present the results of two-pion Bose-Einstein correlations measured in Pb--Pb collisions at a center-of-mass energy sqrt(s_NN) = 2.76 TeV recorded by ALICE at the Large Hadron Collider. These types of correlations allow to extract, using the technique of femtoscopy (also known as Hanburry-Brown Twiss interferometry, or shortly HBT), the space-time characteristics of the source from the correlation calculated as a function of the pair momentum difference. The femtoscopic analysis was performed using both the Spherical Harmonics decomposition and the standard 3D Cartesian representation of the correlation function. The source sizes in three dimensions, the HBT radii, were extracted by fitting the experimental correlation functions. The resulting dependencies of the radii as a function of centrality and pair transverse momentum are shown. The results indicate the existence of a flowing medium and provide constraints on existing dynamical models. The ALICE Pb-Pb HBT radii are also compared to the pp analysis and other heavy-ion experiments in order to test the multiplicity scaling between different systems.
Pion femtoscopy measurements in ALICE at the LHC
Published 2014 in arXiv: High Energy Physics - Experiment
ABSTRACT
PUBLICATION RECORD
- Publication year
2014
- Venue
arXiv: High Energy Physics - Experiment
- Publication date
2014-02-10
- Fields of study
Physics
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CLAIMS
CONCEPTS
- centrality
A measure of the collision overlap geometry used to classify Pb-Pb events.
- dynamical models
Theory models of heavy-ion collision dynamics used for comparison with the measured radii.
- femtoscopy
A correlation-based technique used to infer the space-time characteristics of the particle-emitting source.
Aliases: HBT interferometry, Hanbury Brown Twiss interferometry, HBT
- flowing medium
A medium with collective flow whose expansion affects the measured source radii.
- hbt radii
Source-size parameters obtained by fitting the correlation function in the three-dimensional femtoscopic analysis.
Aliases: HBT radius
- pair transverse momentum
The transverse momentum of a pion pair used as a kinematic variable in the analysis.
Aliases: kT
- spherical harmonics decomposition
A basis decomposition of the correlation function into spherical-harmonic components.
- standard 3d cartesian representation
A three-dimensional Cartesian form of the correlation function used for the fit.
Aliases: 3D Cartesian representation
- two-pion bose-einstein correlations
Quantum-statistical correlations measured between pairs of identical pions in the final state.
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