REAL

Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √sNN = 2.76 TeV

Abelev, B. and Adam, J. and Adamová, D. and Adare, A. M. and Aggarwal, M. M. and Aglieri, Rinella G. and Agócs, András and Agostinelli, A. and Aguilar, Salazar S. and Ahammed, Z. and Ahmad, N. and Ahmad, Masoodi A. and Ahn, S. A. and Ahn, S. U. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alfaro, Molina R. and Alici, A. and Alkin, A. and Almaráz, Aviña E. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Lévai, Péter and Molnár, Levente and Pochybova, Sona (2013) Centrality dependence of charged particle production at large transverse momentum in Pb–Pb collisions at √sNN = 2.76 TeV. PHYSICS LETTERS B, 720 (1-3). pp. 52-62. ISSN 0370-2693

[img]
Preview
Text
1208.2711v3.pdf
Available under License Creative Commons Attribution.

Download (455kB) | Preview

Abstract

The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range | η| < 0.8 as a function of event centrality in Pb–Pb collisions at √sNN = 2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15 < pT < 50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA ≈ 0.13 at pT = 6–7 GeV/c. Above pT = 7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA ≈ 0.4 for pT > 30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA = 0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.

Item Type: Article
Subjects: Q Science / természettudomány > QC Physics / fizika
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 29 Apr 2024 14:43
Last Modified: 29 Apr 2024 14:43
URI: https://real.mtak.hu/id/eprint/193579

Actions (login required)

Edit Item Edit Item