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Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at p sNN = 2:76TeV

E Abbas Nelson Carlin Filho; Gabriel Oliveira Valeriano de Barros; Airton Deppman; Marcel Araujo Silva Figueredo; Cristiane Jahnke; Denise Aparecida Moreira de Godoy; Marcelo Gameiro Munhoz; Antonio Carlos Oliveira da Silva; Elienos Pereira de Oliveira Filho; Alexandre Alarcon do Passo Suaide; Alejandro Szanto de Toledo

São Paulo 2013

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Título:
Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at p sNN = 2:76TeV
Autor: E Abbas
Nelson Carlin Filho; Gabriel Oliveira Valeriano de Barros; Airton Deppman; Marcel Araujo Silva Figueredo; Cristiane Jahnke; Denise Aparecida Moreira de Godoy; Marcelo Gameiro Munhoz; Antonio Carlos Oliveira da Silva; Elienos Pereira de Oliveira Filho; Alexandre Alarcon do Passo Suaide; Alejandro Szanto de Toledo
Assuntos: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS; CROMODINÂMICA QUÂNTICA
Notas: arXiv.1304.0347
Descrição: We present the ﬁrst wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0–5%, 5–10%, 10–20%, and 20–30% most central events) in Pb–Pb collisions at p sNN = 2:76TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors,-5:0 < h < 5:5, and employing a special analysis technique based on collisions arising from LHC ‘satellite’ bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles (Nch = 17165 772 for the 0-5% most central collisions). From the measured dNch=dh distribution we derive the rapidity density distribution, dNch=dy, under simple assumptions. The rapidity density distribution is found to be signiﬁcantly wider than the predictions of the Landau model. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models.
Editor: São Paulo
Data de criação/publicação: 2013
Formato: 21 p.
Idioma: Inglês

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Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at p sNN = 2:76TeV

São Paulo 2013

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