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Forward-central two-particle correlations in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

J. Adam G. Conesa Balbastre 1 J. Faivre 1 C. Furget 1 R. Guernane 1 J.S. Real 1 C. Silvestre 1 A. Vauthier 1 R. Vernet 2 I. Belikov 3 B. Hippolyte 3 C. Kuhn 3 A. Maire 3 L. Molnar 3 F. Rami 3 C. Roy 3 X. Sanchez Castro 3 Laurent Aphecetche 4 A. Baldisseri G. Batigne H. Borel 5 J. Castillo Castellanos 5 J.L. Charvet 5 C. Cheshkov 6 B. Cheynis 6 L. Ducroux 6 Marie Germain 4 J.-Y. Grossiord A. Lardeux 5 J. Martin Blanco 4 Gines Martinez Garcia 4 L. Massacrier 4 H. Pereira Da Costa 5 Philippe Pillot 4 L. Ronflette 4 Y. Schutz 4 Alexandre Shabetai 4 B. Teyssier 6 R. Tieulent 6 A. Uras 6 M. Wang 4 V. Barret 7 N. Bastid 7 A. Batista Camejo 7 P. Crochet 7 P. Dupieux 7 V.J.G. Feuillard 5, 7 S. Li 7 X. Lopez 7 F. Manso 7 S. Porteboeuf-Houssais 7 P. Rosnet 7 B. Vulpescu 7 Z. Conesa Del Valle 8 I. Das 8 B. Espagnon 8 C. Hadjidakis 8 I. Lakomov 8 Diego Stocco 4 C. Suire 8 J. D. Tapia Takaki 8 M. Tarhini 8 L. Valencia Palomo 8
1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 IPHC - Institut Pluridisciplinaire Hubert Curien
4 SUBATECH - Laboratoire SUBATECH Nantes
5 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
6 IPNL - Institut de Physique Nucléaire de Lyon
7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
8 IPNO - Institut de Physique Nucléaire d'Orsay
Abstract : Two-particle angular correlations between trigger particles in the forward pseudorapidity range ($2.5 < |\eta| < 4.0$) and associated particles in the central range ($|\eta| < 1.0$) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum ($p_{\rm T}$) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about $16\pm6$%, rather independent of $p_{\rm T}$ within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different $p_{\rm T}$ and $\eta$ dependence than observed in the data. The results are sensitive to the parent particle $v_2$ and composition of reconstructed muon tracks, where the contribution from heavy flavour decays are expected to dominate at $p_{\rm T}>2$ GeV/$c$.
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http://hal.in2p3.fr/in2p3-01172182
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, July 7, 2015 - 9:15:24 AM
Last modification on : Thursday, February 25, 2021 - 10:58:34 AM

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

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J. Adam, G. Conesa Balbastre, J. Faivre, C. Furget, R. Guernane, et al.. Forward-central two-particle correlations in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. Physics Letters B, Elsevier, 2016, 753, pp.126-139. ⟨10.1016/j.physletb.2015.12.010⟩. ⟨in2p3-01172182⟩

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