Pseudorapidity density of charged particles in p–Pb collisions at √sNN=5.02 TeV

Abelev, B. and Adam, J. and Adamová, D. and Adare, A. M. and Aggarwal, M. M. and Aglieri, Rinella G. and Agnello, M. and Agócs, András and Agostinelli, A. and Ahammed, Z. and Ahmad, N. and Ahmad, Masoodi A. and Ahn, S. U. and Ahn, S. A. and Ajaz, M. 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 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) Pseudorapidity density of charged particles in p–Pb collisions at √sNN=5.02 TeV. PHYSICAL REVIEW LETTERS, 110 (3). ISSN 0031-9007

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Abstract

The charged-particle pseudorapidity density measured over 4 units of pseudorapidity in non-single- diffractive (NSD) p–Pb collisions at a centre-of-mass energy per nucleon pair √sNN= 5.02 TeV is presented. The average value at midrapidity is measured to be 16.81 ± 0.71 (syst.), which corre- sponds to 2.14 ± 0.17 (syst.) per participating nucleon, calculated with the Glauber model. This is 16% lower than in NSD pp collisions interpolated to the same collision energy, and 84% higher than in d–Au collisions at √sNN = 0.2 TeV. The measured pseudorapidity density in p–Pb collisions is compared to model predictions, and provides new constraints on the description of particle produc- tion in high-energy nuclear collisions.

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