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Observation of Associated Near-side and Away-side Long-range Correlations in sqrt(s_NN)=5.02 TeV Proton-lead Collisions with the ATLAS Detector

By G. Aad, S. Albrand, Q. Buat, B. Clement, J. Collot, S. Crépé-Renaudin, B. Dechenaux, T. Delemontex, P.A. Delsart, M.H. Genest, J.Y. Hostachy, E. Laisne, F. Ledroit-Guillon, A. Lleres, A. Lucotte, F. Malek, J. Stark, X. Sun, B. Trocmé, C. Weydert, C. Biscarat, G. Rahal, D. Boumediene, Emmanuel Busato, D. Calvet, S. Calvet, Reina Coromoto Camacho Toro, J. Donini, E. Dubreuil, Ph. Gris, N. Ghodbane, C. Guicheney, H. Liao, D. Pallin, Daniela Paredes Hernández, F. Podlyski, C. Santoni, Timothée Theveneaux-Pelzer, Loïc Valery, F. Vazeille, S. Abdel Khalek, N. Andari, E. Augé, M. Benoit, S. Binet, C. Bourdarios, C. De La Taille, J.B. De Vivie De Regie, L. Duflot, M. Escalier, L. Fayard, D. Fournier, J.-F. Grivaz, S. Henrot-Versillé, J. Hrivnac, L. Iconomidou-Fayard, J. Idarraga, M. Kado, N. Lorenzo Martinez, A. Lounis, N. Makovec, F. Niedercorn, L. Poggioli, P. Puzo, A. Renaud, D. Rousseau, G. Rybkin, J.B. Sauvan, J. Schaarschmidt, A.C. Schaffer, L. Serin, S. Simion, R. Tanaka, M. Teinturier, J.J. Veillet, D. Zerwas, Zhen Zhang, L. Aperio Bella, B. Aubert, N. Berger, J. Colas, M. Delmastro, L. Di Ciaccio, T.K.O. Doan, S. Elles, C. Goy, T. Hryn'Ova, S. Jézéquel, H. Keoshkerian, R. Lafaye, J. Leveque, V.P. Lombardo, N. Massol, P. Perrodo, E. Petit, H. Przysiezniak, E. Richter-Was, G. Sauvage, E. Sauvan, M. Schwoerer, T. Todorov, D. Tsionou, I. Wingerter-Seez, R. Zitoun, M. Barbero, C. P. Bee, C. Bertella, N. Bousson, J. C. Clémens, Y. Coadou, F. Djama, F. Etienne, L. Feligioni, D. Hoffmann, F. Hubaut, E.B.F.G. Knoops, E. Le Guirriec, B. Li, J. Maurer, E. Monnier, Y. Nagai, J. Odier, P. Pralavorio, A. Rozanov, T. Serre, M. Talby, N. Tannoury, E. Tiouchichine, S. Tisserant, J. Toth, F. Touchard, M. Ughetto, L. Vacavant and F. Vannucci

Abstract

See paper for full list of authors - 5 pages plus author list (18 pages total), 4 figures, submitted to Physical Review Letter. Addtional auxiliary plots can be found at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2012-13/Two-particle correlations in relative azimuthal angle (Delta-phi) and pseudorapidity (Delta-eta) are measured in sqrt(s_NN) = 5.02 TeV p+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 mub^-1 of data as a function of p_T and the transverse energy (SumE_T) summed over 3.1 < eta < 4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2<|Delta-eta|<5) near-side (Delta-phi ~ 0) correlation that grows rapidly with increasing SumE_T. A long-range away-side (Delta-phi ~ pi) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small SumE_T, is found to match the near-side correlation in magnitude, shape (in Delta-eta and Delta-phi) and SumE_T dependence. The resultant Delta-phi correlation is approximately symmetric about pi/2, and is consistent with a cos(2Delta-phi) modulation for all SumE_T ranges and particle p_T. The amplitude of this modulation is comparable in magnitude and p_T dependence to similar modulations observed in heavy-ion collisions, suggestive of final-state collective effects in high multiplicity events

Topics: [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: American Physical Society
Year: 2013
DOI identifier: 10.1103/PhysRevLett.110.182302
OAI identifier: oai:HAL:in2p3-00768613v1
Provided by: Hal-Diderot
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