Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

J. Adam; J.C. Hamon; B. Hippolyte; C. Kuhn; A. Maire; C. Roy; Y. Schutz; S. Senyukov; V. Barret; N. Bastid; A. Batista Camejo; P. Crochet; P. Dupieux; V.J.G. Feuillard; X. Lopez; F. Manso; S. Porteboeuf-Houssais; P. Rosnet; Laurent Aphecetche; B. Audurier; G. Batigne; B. Erazmus; A. Francisco; Marie Germain; G. Martinez-Garcia; L. Molnar; A. Morreale; P. Pillot; L. Ronflette; A. Shabetai; Diego Stocco; . J. Zhu; C. Cheshkov; B. Cheynis; L. Ducroux; B. Teyssier; R. Tieulent; A. Uras; R. Vernet; G. Conesa Balbastre; J. Faivre; C. Furget; R. Guernane; C. Silvestre; A. Vauthier; H. Yokoyama; Z. Conesa Del Valle; I. Das; B. Espagnon; C. Hadjidakis; I. Lakomov; C. Suire; J. D. Tapia Takaki; M. Tarhini; L. Valencia Palomo

doi:10.1016/j.physletb.2017.07.017

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

J. Adam J.C. Hamon ¹ B. Hippolyte ¹ C. Kuhn ¹ A. Maire ¹ C. Roy ¹ Y. Schutz ^{1, 2} S. Senyukov ¹ V. Barret ³ N. Bastid ³ A. Batista Camejo ³ P. Crochet ³ P. Dupieux ³ V.J.G. Feuillard ³ X. Lopez ³ F. Manso ³ S. Porteboeuf-Houssais ³ P. Rosnet ³ Laurent Aphecetche ² B. Audurier ² G. Batigne ² B. Erazmus ² A. Francisco ² Marie Germain ² G. Martinez-Garcia ² L. Molnar ² A. Morreale ² P. Pillot ² L. Ronflette ² A. Shabetai ² Diego Stocco ² . J. Zhu ² C. Cheshkov ⁴ B. Cheynis ⁴ L. Ducroux ⁴ B. Teyssier ⁴ R. Tieulent ⁴ A. Uras ⁴ R. Vernet ⁵ G. Conesa Balbastre ⁶ J. Faivre ⁶ C. Furget ⁶ R. Guernane ⁶ C. Silvestre ⁶ A. Vauthier ⁶ H. Yokoyama ⁶ Z. Conesa Del Valle ⁷ I. Das ⁷ B. Espagnon ⁷ C. Hadjidakis ⁷ I. Lakomov ⁷ C. Suire ⁷ J. D. Tapia Takaki ⁷ M. Tarhini ⁷ L. Valencia Palomo ⁷

1 IPHC - Institut Pluridisciplinaire Hubert Curien

2 SUBATECH - Laboratoire SUBATECH Nantes

3 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

4 IPNL - Institut de Physique Nucléaire de Lyon

5 CC-IN2P3 - Centre de Calcul de l'IN2P3

6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

7 IPNO - Institut de Physique Nucléaire d'Orsay

Abstract : We present the charged-particle pseudorapidity density in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02\,\mathrm{Te\kern-.25exV}$ in centrality classes measured by ALICE. The measurement covers a wide pseudorapidity range from $-3.5$ to $5$, which is sufficient for reliable estimates of the total number of charged particles produced in the collisions. For the most central (0-5%) collisions we find $21\,400\pm 1\,300$ while for the most peripheral (80-90%) we find $230\pm 38$. This corresponds to an increase of $(27\pm4)\%$ over the results at $\sqrt{s_{\mathrm{NN}}}=2.76\,\mathrm{Te\kern-.25exV}$ previously reported by ALICE. The energy dependence of the total number of charged particles produced in heavy-ion collisions is found to obey a modified power-law like behaviour. The charged-particle pseudorapidity density of the most central collisions is compared to model calculations --- none of which fully describes the measured distribution. We also present an estimate of the rapidity density of charged particles. The width of that distribution is found to exhibit a remarkable proportionality to the beam rapidity, independent of the collision energy from the top SPS to LHC energies.

Type de document :

Article dans une revue

Physics Letters B, Elsevier, 2017, 772, pp.567-577. 〈10.1016/j.physletb.2017.07.017〉

Domaine :

Physique [physics] / Physique Nucléaire Expérimentale [nucl-ex]

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http://hal.in2p3.fr/in2p3-01425241
Contributeur : Sylvie Flores <>
Soumis le : mardi 3 janvier 2017 - 14:21:45
Dernière modification le : jeudi 21 février 2019 - 16:02:10

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

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Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

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