Pion femtoscopy measurements in ALICE at the LHC

Abstract

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.

7 pages, 5 figures, submitted to the European Physical Journal: Web of Conferences (proceedings of ICNFP 2013 conference)

References in corpus (5)

• Centrality dependence of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Azimuthally-sensitive femtoscopy from RHIC to LHC in hydrodynamics with statistical hadronization
• Global Conservation Laws and Femtoscopy of Small Systems
• Analyzing Correlation Functions with Tesseral and Cartesian Spherical Harmonics

Cited by in corpus (8)

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• Relativistic anisotropic hydrodynamics
• Towards a Deeper Understanding of How Experiments Constrain the Underlying Physics of Heavy-Ion Collisions
• Anisotropic hydrodynamic modeling of 2.76 TeV Pb-Pb collisions
• Hanbury Brown--Twiss Interferometry and Collectivity in Small Systems
• Anisotropic hydrodynamic modeling of heavy-ion collisions at LHC and RHIC
• The Multiplicity Dependence of Pion Interferometry in Hydrodynamics
• Hadronic observables from a hadronic rescattering model in $Pb+Pb$ collisions at $\sqrt{s_{NN}}=2.76$ TeV