Flow dominance and factorization of transverse momentum correlations in Pb-Pb collisions at the LHC

J. Adam I. Belikov 1 J.C. Hamon 1 B. Hippolyte 1 C. Kuhn 1 A. Maire 1 C. Roy 1 Y. Schutz 1, 2 S. Senyukov 1 A. Baldisseri 3 H. Borel 3 J. Castillo Castellanos 3 J.L. Charvet 3 V.J.G. Feuillard 3, 4 A. Lardeux 3 S. Panebianco 3 H. Pereira Da Costa 3 A. Rakotozafindrabe 3 Laurent Aphecetche 2 B. Audurier 2 Guillaume Batigne 2 B. Erazmus 2 A. Francisco 2 Marie Germain 2 A. Morreale 2 Philippe Pillot 2 Gines Martinez Garcia 2 L. Ronflette 2 Alexandre Shabetai 2 Diego Stocco 2 J. Zhu 2 C. Cheshkov 5 B. Cheynis 5 L. Ducroux 5 B. Teyssier 5 R. Tieulent 5 A. Uras 5 R. Vernet 6 G. Conesa Balbastre 7 J. Faivre 7 C. Furget 7 R. Guernane 7 C. Silvestre 7 A. Vauthier 7 H. Yokoyama 7 V. Barret 4 N. Bastid 4 A. Batista Camejo 4 P. Crochet 4 P. Dupieux 4 X. Lopez 4 F. Manso 4 S. Porteboeuf-Houssais 4 P. Rosnet 4
1 IPHC - Institut Pluridisciplinaire Hubert Curien
2 SUBATECH - Laboratoire SUBATECH Nantes
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 IPNL - Institut de Physique Nucléaire de Lyon
6 CC-IN2P3 - Centre de Calcul de l'IN2P3
7 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Abstract : We present the first measurement of the two-particle transverse momentum differential correlation function, $P_2\equiv\langle \Delta p_{\rm T} \Delta p_{\rm T} \rangle /\langle p_{\rm T} \rangle^2$, in Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}} =$ 2.76 TeV. Results for $P_2$ are reported as a function of relative pseudorapidity ($\Delta \eta$) and azimuthal angle ($\Delta \varphi$) between two particles for different collision centralities. The $\Delta \phi$ dependence is found to be largely independent of $\Delta \eta$ for $|\Delta \eta| \geq$ 0.9. In 5% most central Pb-Pb collisions, the two-particle transverse momentum correlation function exhibits a clear double-hump structure around $\Delta \varphi = \pi$ (i.e., on the away side), which is not observed in number correlations in the same centrality range, and thus provides an indication of the dominance of triangular flow in this collision centrality. Fourier decompositions of $P_2$, studied as a function of collision centrality, show that correlations at $|\Delta \eta| \geq$ 0.9 can be well reproduced by a flow ansatz based on the notion that measured momentum correlations are strictly determined by the collective motion of the system.
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Journal articles
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http://hal.in2p3.fr/in2p3-01464131
Contributor : Sylvie Flores <>
Submitted on : Friday, February 10, 2017 - 7:30:23 AM
Last modification on : Wednesday, January 15, 2020 - 2:08:11 PM

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IN2P3 | IPNL | CNRS | DSM-IRFU | DRS-IPHC | IPHC | UNIV-NANTES | CEA | SUBATECH | LPSC | LPC-CLERMONT | PRES_CLERMONT | UGA | UNIV-PARIS-SACLAY | UNIV-LYON1 | CEA-DRF | SITE-ALSACE | CEA-UPSAY | IMT-ATLANTIQUE | SUBATECH-PLASMA | IP2I | UDL

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J. Adam, I. Belikov, J.C. Hamon, B. Hippolyte, C. Kuhn, et al.. Flow dominance and factorization of transverse momentum correlations in Pb-Pb collisions at the LHC. Physical Review Letters, American Physical Society, 2017, 118, pp.162302. ⟨10.1103/PhysRevLett.118.162302⟩. ⟨in2p3-01464131⟩

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