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; Z. Barnovska; N. Berger; M. Delmastro; L. Di Ciaccio; T.K.O. Doan; S. Elles; C. Goy; T. Hryn’ova; S. Jézéquel; I. Koletsou; R. Lafaye; J. Leveque; N. Massol; G. Sauvage; E. Sauvan; O. Simard; T. Todorov; I. Wingerter-Seez; G . Rahal; L. Alio; M. Barbero; C. Bertella; N. Bousson; J.-C. Clémens; Y. Coadou; F. Djama; L. Feligioni; J. Gao; D. Hoffmann; F. Hubaut; E. B. F. G. Knoops; E. Le Guirriec; B. Li; J. Maurer; E. Monnier; S. Muanza; Y. Nagai; P. Pralavorio; A. Rozanov; T. Serre; M. Talby; N. Tannoury; E. Tiouchichine; S. Tisserant; J. Toth; F. Touchard; M. Ughetto; L. Vacavant; S. Albrand; J. Brown; B. Clement; J. Collot; S. Crépé-Renaudin; B. Dechenaux; T. Delemontex; P.A. Delsart; C. Gabaldon; M.H. Genest; J.Y. Hostachy; E. Laisne; B.T. Le; F. Ledroit-Guillon; A. Lleres; A. Lucotte; F. Malek; C. Monini; J. Stark; X. Sun; B. Trocmé; D. Boumediene; Emmanuel Busato; D. Calvet; S. Calvet; J. Donini; E. Dubreuil; N. Ghodbane; Ph. Gris; C. Guicheney; H. Liao; D. Pallin; F. Podlyski; C. Santoni; Timothée Theveneaux-Pelzer; Loïc Valery; F. Vazeille; M.K. Ayoub; A. Bassalat; C. Bécot; S. Binet; C. Bourdarios; D. Delgove; J-B. de Vivie De Regie; L. Duflot; M. Escalier; L. Fayard; D. Fournier; E.L. Gkougkousis; J-F. Grivaz; T. Guillemin; F. Hariri; S. Henrot-Versille; J. Hrivnac; L. Iconomidou-Fayard; M. Kado; A. Lounis; N. Makovec; N. Morange; C. Nellist; P. Petroff; L. Poggioli; P. Puzo; A. Renaud; D. Rousseau; G. Rybkin; A.C. Schaffer; E. Scifo; L. Serin; S. Simion; R. Tanaka; D. Zerwas; Zhongkai Zhang; Y. Zhao

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

1 CPPM - Centre de Physique des Particules de Marseille

2 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules

3 CC-IN2P3 - Centre de Calcul de l'IN2P3

4 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

6 LAL - Laboratoire de l'Accélérateur Linéaire

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.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

Physics [physics] / Nuclear Experiment [nucl-ex]

Complete list of metadatas

http://hal.in2p3.fr/in2p3-01185504
Contributor : Claudine Bombar <>
Submitted on : Thursday, August 20, 2015 - 2:36:49 PM
Last modification on : Monday, October 22, 2018 - 9:42:01 AM

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

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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

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