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Two and Three-Pion Quantum Statistics Correlations in Pb-Pb Collisions at sqrt(sNN)=2.76 TeV at the LHC

B. Abelev Laurent Aphecetche 1 Y.W. Baek 2 V. Barret 2 N. Bastid 2 Guillaume Batigne 1 A.A.E. Bergognon 1 M. Bregant 1 C. Cheshkov 3 B. Cheynis 3 P. Crochet 2 H. Delagrange 1 L. Ducroux 3 P. Dupieux 2 B. Erazmus 1 Magali Estienne 1 Marie Germain 1 J.-Y. Grossiord 3 M. Guilbaud 3 B. Hippolyte 4 J.-C. Ianigro 3 C. Kuhn 4 A. Lardeux 1 S. Li 2 X. Lopez 2 A. Maire 4 M. Marchisone 2 Gines Martinez Garcia 1 J. Martin Blanco 1 A. Mas 1 L. Massacrier 1 L. Molnar 4 A. Morreale 1 Philippe Pillot 1 S. Porteboeuf-Houssais 2 L. Ronflette 1 P. Rosnet 2 C. Roy 1 X. Sanchez Castro 4 Y. Schutz 1 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 3 L. Valencia Palomo 2 R. Vernet 5 B. Vulpescu 2 M. Wang 1 X. Zhang 2 Y. Zoccarato 3 F. Manso 2 N. Arbor 6 G. Conesa Balbastre 6 J. Faivre 6 C. Furget 6 R. Guernane 6 S. Kox 6 J.S. Real 6 C. Silvestre 6 Z. Conesa Del Valle 7 I. Das 7 B. Espagnon 7 C. Hadjidakis 7 I. Lakomov 7 C. Suire 7 J. D. Tapia Takaki 7 L. Valencia Palomo 7 Alberto Baldisseri 8 Herve Borel 8 Javier Castillo Castellanos 8 Jean-Luc Charvet 8 Hugo Pereira da Costa 8 A Rakotozafindrabe 9, 8
Abstract : Correlations induced by quantum statistics are sensitive to the spatio-temporal extent as well as dynamics of particle emitting sources in heavy-ion collisions. In addition, such correlations can be used to search for the presence of a coherent component of pion production. Two and three-pion correlations of same and mixed-charge are measured at low relative momentum to estimate the coherent fraction of charged pions in Pb-Pb collisions at sqrt(sNN)= 2.76 TeV at the LHC with ALICE. The genuine three-pion quantum statistics correlation is found to be suppressed relative to the two-pion correlation based on the assumption of fully chaotic pion emission.The suppression is observed to decrease with triplet momentum. The observed suppression at low triplet momentum may correspond to a coherent fraction in charged pion emission of 22% +- 12%.
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Submitted on : Wednesday, October 30, 2013 - 9:09:32 AM
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B. Abelev, Laurent Aphecetche, Y.W. Baek, V. Barret, N. Bastid, et al.. Two and Three-Pion Quantum Statistics Correlations in Pb-Pb Collisions at sqrt(sNN)=2.76 TeV at the LHC. Physical Review C, American Physical Society, 2014, 89, pp.024911. ⟨10.1103/PhysRevC.89.024911⟩. ⟨in2p3-00878401⟩



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