Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead and proton-proton collisions with the ATLAS detector

M. Aaboud Z. Barnovska 1 N. Berger 1 M. Delmastro 1 L. Di Ciaccio 1 S. Elles 1 K. Grevtsov 1 T. Guillemin 1 T. Hryn’ova 1 S. Jézéquel 1 I. Koletsou 1 R. Lafaye 1 J. Levêque 1 P. Mastrandea 1 G. Sauvage 1 E. Sauvan 1 B.H. Smart 1 T. Todorov 1 I. Wingerter-Seez 1 E. Yatsenko 1 D. Boumediene 2 E. Busato 2 D. Calvet 2 S. Calvet 2 A.R. Chomont 2 J. Donini 2 Ph. Gris 2 R. Madar 2 D. Pallin 2 S.M. Romano Saez 2 C. Santoni 2 D. Simon 2 F. Vazeille 2 S. Albrand 3 S. Berlendis 3 A. Bethani 3 C. Camincher 3 J. Collot 3 S. Crépé-Renaudin 3 P.A. Delsart 3 C. Gabaldon 3 M.H. Genest 3 P.O.J. Gradin 3 J.Y. Hostachy 3 F. Ledroit-Guillon 3 A. Lleres 3 A. Lucotte 3 F. Malek 3 E. Petit 3 J. Stark 3 B. Trocmé 3 M. Wu 3 M.K. Ayoub 4 A. Bassalat 4 S. Binet 2 C. Becot C. Bourdarios 4 J.B. de Vivie De Regie 4 D. Delgove 4 L. Duflot 4 M. Escalier 4 L. Fayard 4 D. Fournier 4 E.L. Gkougkousis 4 J.-F. Grivaz 4 F. Hariri 4 S. Henrot-Versille 4 J. Hrivnac 4 L. Iconomidou-Fayard 4 M. Kado 4 A. Lounis 4 N. Makovec 4 N. Morange 4 C. Nellist 4 P. Petroff 4 L. Poggioli 4 P. Puzo 4 A. Renaud 4 G. Rybkin 4 D. Rousseau 4 A.C. Schaffer 4 L. Serin 4 E. Scifo 4 S. Simion 4 R. Tanaka 4 D. Zerwas 4 Zhongkai Zhang 4 Y. Zhao 5 G. Rahal 5 G. Aad 6 M. Alstaty 6 M. Barbero 6 A. Calandri 6 T.P. Calvet 6 Y. Coadou 6 K. de Vasconcelos Corga 6 C. Diaconu 6 S. Diglio 6 F. Djama 6 V. Ellajosyula 6 L. Feligioni 6 J. Gao 7, 6 A. Hadef 6 G.D. Hallewell 6 F. Hubaut 6 S.J. Kahn 6 E. B. F. G. Knoops 6 R. Kukla 6 E. Le Guirriec 6 J. Liu 6 K. Liu 6 D. Madaffari 6 E. Monnier 6 S. Muanza 6 E. Nagy 6 P. Pralavorio 6 Y. Rodina 6 A. Rozanov 6 M. Talby 6 T. Theveneaux-Pelzer 6 R.E. Ticse Torres 6 S. Tisserant 6 J. Toth 8, 6 F. Touchard 6 L. Vacavant 6 C. Wang 6
Abstract : Two-particle pseudorapidity correlations are measured in $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV Pb+Pb, $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV $p$+Pb, and $\sqrt{s}$ = 13 TeV $pp$ collisions at the LHC, with total integrated luminosities of approximately 7 $\mu\mathrm{b}^{-1}$, 28 $\mathrm{nb}^{-1}$, and 65 $\mathrm{nb}^{-1}$, respectively. The correlation function $C_{\rm N}(\eta_1,\eta_2)$ is measured as a function of event multiplicity using charged particles in the pseudorapidity range $|\eta|<2.4$. The correlation function contains a significant short-range component, which is estimated and subtracted. After removal of the short-range component, the shape of the correlation function is described approximately by $1+\langle{a_1^2}\rangle \eta_1\eta_2$ in all collision systems over the full multiplicity range. The values of $\sqrt{\langle{a_1^2}\rangle}$ are consistent between the opposite-charge pairs and same-charge pairs, and for the three collision systems at similar multiplicity. The values of $\sqrt{\langle{a_1^2}\rangle}$ and the magnitude of the short-range component both follow a power-law dependence on the event multiplicity. The $\eta$ distribution of the short-range component, after symmetrizing the proton and lead directions in $p$+Pb collisions, is found to be smaller than that in $pp$ collisions with comparable multiplicity.
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Contributeur : Claudine Bombar <>
Soumis le : mercredi 29 juin 2016 - 10:35:04
Dernière modification le : mardi 5 juin 2018 - 16:40:03

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M. Aaboud, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead and proton-proton collisions with the ATLAS detector. Physical Review C, American Physical Society, 2017, 95, pp.064914. 〈https://journals.aps.org/prc/abstract/10.1103/PhysRevC.95.064914〉. 〈10.1103/PhysRevC.95.064914〉. 〈in2p3-01338736〉

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