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“School of Particles”

Paper IPM / Particles / 12092

School of Particles and Accelerator

Title:

Dependence on pseudorapidity and centrality of charged hadron production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of sqrt(SNN)= 2.76 TeV

Author(s):

1 .	Hessamadin Arfaei
2 .	Hamed Bakhshiansohi
3 .	Seyed Mohsen Etesami
4 .	Ali Fahim
5 .	Majid Hashemi
6 .	Hoda Hesari
7 .	Abideh Jafari
8 .	Mohsen Khakzad
9 .	A Mohammadi
10 .	Mojtaba Mohammadi Najafabadi
11 .	Saeid Paktinat
12 .	Batool Safarzadeh
13 .	Maryam Zeinali

Status:

Submitted

Journal:

High Energy Physics

Year:

2011

Supported by:

IPM

Abstract:

A measurement is presented of the charged hadron ultiplicity in hadronic PbPb collisions, as a function of pseudorapidity and centrality, at a collision energy of 2.76 TeV per nucleon pair. The data sample is collected using the CMS detector and a minimum-bias trigger, with the CMS solenoid off. The number of charged hadrons is measured both by counting the number of reconstructed particle hits and by forming hit doublets of pairs of layers in the pixel detector. The two methods give consistent results. The charged hadron multiplicity density, dNch/dhjh=0, for head-on collisions is found to be 1612 +- 55, where the uncertainty is dominated by systematic effects.Comparisons of these results to previous measurements and to various models are also presented

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