Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector

Measurement of the centrality dependence of the charged particle pseudorapidity distribution in lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector

The ATLAS experiment at the LHC has measured the centrality dependence of charged particle pseudorapidity distributions over |eta| < 2 in lead-lead collisions at a nucleon-nucleon centre-of-mass energy of sqrt(s_NN) = 2.76 TeV. In order to include particles with transverse momentum as low as 30 M...

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Veröffentlicht in:Physics letters. B 2012, Vol.710, p.363-382
Hauptverfasser: Aad, G., Albrand, S., Andrieux, M.L., Clement, B., Collot, J., Crépé-Renaudin, S., de Saintignon, P., Delsart, P.A., Donini, J., Dzahini, Daniel, Hostachy, J.Y., Laisne, E., Ledroit-Guillon, F., Lleres, A., Lucotte, A., Malek, F., Martin, P., Polci, F., Stark, J., Sun, X., Trocmé, B., Weydert, C., Biscarat, C., Cogneras, E., Rahal, G., Bachacou, H., Bauer, F., Besson, N., Bolnet, N.M., Boonekamp, M., Chevalier, L., Ernwein, J., Etienvre, A.I., Formica, A., Gauthier, L., Giraud, F., Guyot, C., Hassani, S., Kozanecki, W., Lancon, E., Laporte, J.F., Le Menedeu, E., Legendre, M., Mansoulie, B., Meyer, J.-P., Morange, N., Mountricha, E., Hong, Thi, Nicolaidou, R., Ouraou, A., Pomarede, D.M., Resende, B., Royon, C.R., Schune, Ph, Schwindling, J., Simard, O., Virchaux, M., Xu, C., Yu, J., Busato, Emmanuel, Calvet, D., Calvet, S., Camacho Toro, Reina Coromoto, Cinca, Diane, Febbraro, R., Ghodbane, N., Guicheney, C., Pallin, D., Podlyski, F., Santoni, C., Says, L. P., Vazeille, F., Aoun, S., Bee, C. P., Benchouk, C., Bernardet, K., Bousson, N., Clémens, J. C., Coadou, Y., Delpierre, P., Djama, F., Etienne, F., Feligioni, L., Henry-Couannier, F., Hoffmann, D., Hubaut, F., Knoops, E. B. F. G., Le Guirriec, E., Li, B., Monnier, E., Odier, J., Petit, E., Pralavorio, P., Qian, Z., Rozanov, A., Talby, M., Tannoury, N., Tisserant, S., Toth, J., Touchard, F.
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:The ATLAS experiment at the LHC has measured the centrality dependence of charged particle pseudorapidity distributions over |eta| < 2 in lead-lead collisions at a nucleon-nucleon centre-of-mass energy of sqrt(s_NN) = 2.76 TeV. In order to include particles with transverse momentum as low as 30 MeV, the data were recorded with the central solenoid magnet off. Charged particles were reconstructed with two algorithms (2-point "tracklets" and full tracks) using information from the pixel detector only. The lead-lead collision centrality was characterized by the total transverse energy in the forward calorimeter in the range 3.2 < |eta| < 4.9. Measurements are presented of the per-event charged particle density distribution, dN_ch/deta, and the average charged particle multiplicity in the pseudorapidity interval |eta|
ISSN:0370-2693
DOI:10.1016/j.physletb.2012.02.045