In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, dNch/dη, and total charged-particle multiplicity, Ntot, in Xe–Xe collisions at a centre-of-mass energy per nucleon–nucleon pair of sqrt(sNN) = 5.44 TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5 < η < 5. The values of dNch/dη at mid-rapidity and Ntot for central collisions, normalised to the number of nucleons participating in the collision (Npart) as a function of sqrt(sNN) follow the trends established in previous heavy-ion measurements. The same quantities are also found to increase as a function of Npart, and up to the 5% most central collisions the trends are the same as the ones observed in Pb–Pb at a similar energy. For more central collisions, the Xe–Xe scaled multiplicities exceed those in Pb–Pb for a similar Npart. The results are compared to phenomenological models and theoretical calculations based on different mechanisms for particle production in nuclear collisions. All considered models describe the data reasonably well within 15%.

Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at sNN=5.44TeV / Acharya, S., Torales-Acosta, F., Adamová, D., Adolfsson, J., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S.U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, S.N., Albuquerque, D.S.D., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Ali, Y., Alici, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 790:(2019), pp. 35-48. [10.1016/j.physletb.2018.12.048]

Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at sNN=5.44TeV

Toppi, M.;
2019

Abstract

In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, dNch/dη, and total charged-particle multiplicity, Ntot, in Xe–Xe collisions at a centre-of-mass energy per nucleon–nucleon pair of sqrt(sNN) = 5.44 TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5 < η < 5. The values of dNch/dη at mid-rapidity and Ntot for central collisions, normalised to the number of nucleons participating in the collision (Npart) as a function of sqrt(sNN) follow the trends established in previous heavy-ion measurements. The same quantities are also found to increase as a function of Npart, and up to the 5% most central collisions the trends are the same as the ones observed in Pb–Pb at a similar energy. For more central collisions, the Xe–Xe scaled multiplicities exceed those in Pb–Pb for a similar Npart. The results are compared to phenomenological models and theoretical calculations based on different mechanisms for particle production in nuclear collisions. All considered models describe the data reasonably well within 15%.
2019
quark gluon plasma
heavy-ion collisions, particle production, ALICE experiment
01 Pubblicazione su rivista::01a Articolo in rivista
Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at sNN=5.44TeV / Acharya, S., Torales-Acosta, F., Adamová, D., Adolfsson, J., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S.U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, S.N., Albuquerque, D.S.D., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Ali, Y., Alici, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 790:(2019), pp. 35-48. [10.1016/j.physletb.2018.12.048]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1469904
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