Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at √SNN =5.02 TeV with the ATLAS detector

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, (2016) Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at √SNN =5.02 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 76. a199. ISSN 1434-6044

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Abstract

The centrality dependence of the mean chargedparticle multiplicity as a function of pseudorapidity is measured in approximately 1 μb−¹ of proton–lead collisions at a nucleon–nucleon centre-of-mass energy of √sNN=5.02 TeV using the ATLAS detector at the Large Hadron Collider. Charged particles with absolute pseudorapidity less than 2.7 are reconstructed using the ATLAS pixel detector. The p + Pb collision centrality is characterised by the total transverse energy measured in the Pb-going direction of the forward calorimeter. The charged-particle pseudorapidity distributions are found to vary strongly with centrality, with an increasing asymmetry between the proton-going and Pb-going directions as the collisions become more central. Three different estimations of the number of nucleons participating in the p+Pb collision have been carried out using the Glauber model as well as two Glauber–Gribov inspired extensions to theGlauber model. Charged-particle multiplicities per participant pair are found to vary differently for these three models, highlighting the importance of including colour fluctuations in nucleon–nucleon collisions in the modelling of the initial state of p + Pb collisions.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 10 Apr 2017 14:47
Last Modified: 10 Apr 2017 14:55
URI: http://sro.sussex.ac.uk/id/eprint/67344

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Project NameSussex Project NumberFunderFunder Ref
ATLASG0275STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I006048/1