The pseudorapidity density of charged particles, dNch=dη, at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of sNN 1⁄4 5.02 TeV. For the 5% most central collisions, we measure a value of 1943 +/- 54. The rise in dNch=dη as a function of sNN is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dNch=dη as a function of the average number of participant nucleons, hNparti, calculated in a Glauber model, is compared with the previous measurement at sNN 1⁄4 2.76 TeV. A constant factor of about 1.2 describes the increase in dNch=dη from sNN 1⁄4 2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%–80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions.

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at √sNN = 5.02 TeV / Adam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S.U., Aiola, S., Akindinov, A., Alam, S.N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., Almaraz, J.R.M., Alme, J., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 116:22(2016), pp. 222302.1-222302.12. [10.1103/PhysRevLett.116.222302]

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at √sNN = 5.02 TeV

CAMERINI, Paolo;FRAGIACOMO, ENRICO;LEA, RAMONA;LUPARELLO, GRAZIA;MARGAGLIOTTI, GIACOMO;PIANO, STEFANO;RUI, RINALDO;ŠULJIĆ, MILJENKO;Zaccolo, V.;
2016-01-01

Abstract

The pseudorapidity density of charged particles, dNch=dη, at midrapidity in Pb-Pb collisions has been measured at a center-of-mass energy per nucleon pair of sNN 1⁄4 5.02 TeV. For the 5% most central collisions, we measure a value of 1943 +/- 54. The rise in dNch=dη as a function of sNN is steeper than that observed in proton-proton collisions and follows the trend established by measurements at lower energy. The increase of dNch=dη as a function of the average number of participant nucleons, hNparti, calculated in a Glauber model, is compared with the previous measurement at sNN 1⁄4 2.76 TeV. A constant factor of about 1.2 describes the increase in dNch=dη from sNN 1⁄4 2.76 to 5.02 TeV for all centrality classes, within the measured range of 0%–80% centrality. The results are also compared to models based on different mechanisms for particle production in nuclear collisions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2879981
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