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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

G. Aad S. Albrand 1 Q. Buat 1 B. Clement 1 J. Collot 1 S. Crépé-Renaudin 1 B. Dechenaux 1 T. Delemontex 1 P.A. Delsart 1 M.H. Genest 1 J.Y. Hostachy 1 E. Laisne 1 F. Ledroit-Guillon 1 A. Lleres 1 A. Lucotte 1 F. Malek 1 J. Stark 1 X. Sun 1 B. Trocmé 1 C. Weydert 1 C. Biscarat 2 G. Rahal 2 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 Reina Coromoto Camacho Toro 3 J. Donini 3 E. Dubreuil 3 Ph. Gris 3 N. Ghodbane 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 Daniela Paredes Hernández 3 F. Podlyski 3 C. Santoni 3 Timothée Theveneaux-Pelzer 3 Loïc Valery 3 F. Vazeille 3 S. Abdel Khalek 4 N. Andari 4 E. Augé 4 M. Benoit 4 S. Binet 4 C. Bourdarios 4 C. de la Taille 4 J.B. de Vivie de Regie 4 L. Duflot 4 M. Escalier 4 L. Fayard 4 D. Fournier 4 J.-F. Grivaz 4 S. Henrot-Versillé 4 J. Hrivnac 4 L. Iconomidou-Fayard 4 J. Idarraga 4 M. Kado 4 N. Lorenzo Martinez 4 A. Lounis 4 N. Makovec 4 F. Niedercorn 4 L. Poggioli 4 P. Puzo 4 A. Renaud 4 D. Rousseau 4 G. Rybkin 4 J.B. Sauvan 4 J. Schaarschmidt 4 A.C. Schaffer 4 L. Serin 4 S. Simion 4 R. Tanaka 4 M. Teinturier 4 J.J. Veillet 4 D. Zerwas 4 Z. Zhang 4 L. Aperio Bella 5 B. Aubert 5 N. Berger 5 J. Colas 5 M. Delmastro 5 L. Di Ciaccio 5 T.K.O. Doan 5 S. Elles 5 C. Goy 5 T. Hryn'Ova 5 S. Jézéquel 5 H. Keoshkerian 5 R. Lafaye 5 J. Leveque 5 V.P. Lombardo 5 N. Massol 5 P. Perrodo 5 E. Petit 5 H. Przysiezniak 5 E. Richter-Was 5 G. Sauvage 5 E. Sauvan 5 M. Schwoerer 5 T. Todorov 5 D. Tsionou 5 I. Wingerter-Seez 5 R. Zitoun 5 M. Barbero 6 C. P. Bee 6 C. Bertella 6 N. Bousson 6 J. C. Clémens 6 Y. Coadou 6 F. Djama 6 F. Etienne 6 L. Feligioni 6 D. Hoffmann 6 F. Hubaut 6 E.B.F.G. Knoops 6 E. Le Guirriec 6 B. Li 6 J. Maurer 6 E. Monnier 6 Y. Nagai 6 J. Odier 6 P. Pralavorio 6 A. Rozanov 6 T. Serre 6 M. Talby 6 N. Tannoury 6 E. Tiouchichine 6 S. Tisserant 6 J. Toth 6 F. Touchard 6 M. Ughetto 6 L. Vacavant 6 F. Vannucci 7
Abstract : 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.
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Submitted on : Saturday, December 22, 2012 - 11:13:35 AM
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G. Aad, S. Albrand, Q. Buat, B. Clement, J. Collot, et al.. 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. Physical Review Letters, American Physical Society, 2013, 110, pp.182302. ⟨10.1103/PhysRevLett.110.182302⟩. ⟨in2p3-00768613⟩

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