Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton--lead collisions at $\sqrt{s_{_{\rm{NN}}}} = 5.02$ TeV with the ATLAS detector

G. Aad 1 Z. Barnovska 2 N. Berger 2 M. Delmastro 2 L. Di Ciaccio 2 T.K.O. Doan 2 S. Elles 2 C. Goy 2 T. Hryn’ova 2 S. Jézéquel 2 I. Koletsou 2 R. Lafaye 2 J. Leveque 2 N. Massol 2 G. Sauvage 2 E. Sauvan 2 O. Simard 2 T. Todorov 2 I. Wingerter-Seez 2 G . Rahal 3 L. Alio 1 M. Barbero 1 C. Bertella 1 N. Bousson 1 J.-C. Clémens 1 Y. Coadou 1 F. Djama 1 L. Feligioni 1 J. Gao 1 D. Hoffmann 1 F. Hubaut 1 E. B. F. G. Knoops 1 E. Le Guirriec 1 B. Li 1 J. Maurer E. Monnier 1 S. Muanza 1 Y. Nagai 1 P. Pralavorio 1 A. Rozanov 1 T. Serre 1 M. Talby 1 N. Tannoury 1 E. Tiouchichine 1 S. Tisserant 1 J. Toth 1 F. Touchard 1 M. Ughetto 1 L. Vacavant 1 S. Albrand 4 J. Brown 4 B. Clement 4 J. Collot 4 S. Crépé-Renaudin 4 B. Dechenaux 4 T. Delemontex 4 P.A. Delsart 4 C. Gabaldon 4 M.H. Genest 4 J.Y. Hostachy 4 E. Laisne 4 B.T. Le 4 F. Ledroit-Guillon 4 A. Lleres 4 A. Lucotte 4 F. Malek 4 C. Monini 4 J. Stark 4 X. Sun 4 B. Trocmé 4 D. Boumediene 5 Emmanuel Busato 5 D. Calvet 5 S. Calvet 5 J. Donini 5 E. Dubreuil 5 N. Ghodbane 5 Ph. Gris 5 C. Guicheney 5 H. Liao 5 D. Pallin 5 F. Podlyski 5 C. Santoni 5 Timothée Theveneaux-Pelzer 5 Loïc Valery 5 F. Vazeille 5 M.K. Ayoub 6 A. Bassalat 6 C. Bécot 6 S. Binet 6 C. Bourdarios 6 D. Delgove 6 J-B. de Vivie De Regie 6 L. Duflot 6 M. Escalier 6 L. Fayard 6 D. Fournier 6 E.L. Gkougkousis 6 J-F. Grivaz 6 T. Guillemin 6 F. Hariri 6 S. Henrot-Versille 6 J. Hrivnac 6 L. Iconomidou-Fayard 6 M. Kado 6 A. Lounis 6 N. Makovec 6 N. Morange 6 C. Nellist 6 P. Petroff 6 L. Poggioli 6 P. Puzo 6 A. Renaud 6 D. Rousseau 6 G. Rybkin 6 A.C. Schaffer 6 E. Scifo 6 L. Serin 6 S. Simion 6 R. Tanaka 6 D. Zerwas 6 Zhongkai Zhang 6 Y. Zhao 6
Abstract : The centrality dependence of the mean charged-particle multiplicity as a function of pseudorapidity is measured in approximately 1 $\mu$b$^{-1}$ of proton--lead collisions at a nucleon--nucleon centre-of-mass energy of $\sqrt{s_{_{\rm{NN}}}} = 5.02$ TeV using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The $p$+Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the $p$+Pb collision have been carried out using the Glauber model as well as two Glauber--Gribov inspired extensions to the Glauber model. Charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon--nucleon collisions in the modelling of the initial state of $p$+Pb collisions.
Type de document :
Article dans une revue
European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2016, 76, pp.199. 〈10.1140/epjc/s10052-016-4002-3〉
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Soumis le : jeudi 20 août 2015 - 14:36:49
Dernière modification le : mercredi 16 mai 2018 - 15:10:07

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G. Aad, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton--lead collisions at $\sqrt{s_{_{\rm{NN}}}} = 5.02$ TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2016, 76, pp.199. 〈10.1140/epjc/s10052-016-4002-3〉. 〈in2p3-01185504〉

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