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Article Dans Une Revue Physical Review C Année : 2017

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) , Jérémy Lévêque (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) , Sara 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)
M. Aaboud
  • Fonction : Auteur
N. Berger
T. Hryn’ova
S. Calvet
C. Becot
  • Fonction : Auteur
D. Rousseau
G. Aad
Y. Coadou
C. Wang

Résumé

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.

Dates et versions

in2p3-01338736 , version 1 (29-06-2016)

Identifiants

Citer

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, 2017, 95, pp.064914. ⟨10.1103/PhysRevC.95.064914⟩. ⟨in2p3-01338736⟩
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