Abstract
In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, dN ch /dη and total charged-particle multiplicity, N ch tot , in Xe–Xe collisions at a centre-of-mass energy per nucleon–nucleon pair of s NN =5.44TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5<η<5. The values of dN ch /dη at mid-rapidity and N ch tot for central collisions, normalised to the number of nucleons participating in the collision (N part ) as a function of s NN follow the trends established in previous heavy-ion measurements. The same quantities are also found to increase as a function of N part , 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 N part . 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%.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 35-48 |
| Number of pages | 14 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 790 |
| DOIs | |
| State | Published - Mar 10 2019 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Cite this
Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at s NN =5.44TeV . / ALICE Collaboration.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 790, 10.03.2019, p. 35-48.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at s NN =5.44TeV
AU - ALICE Collaboration
AU - Acharya, S.
AU - Torales-Acosta, F.
AU - Adamová, D.
AU - Adolfsson, J.
AU - Aggarwal, M. M.
AU - Aglieri Rinella, G.
AU - Agnello, M.
AU - Agrawal, N.
AU - Ahammed, Z.
AU - Ahn, S. U.
AU - Aiola, S.
AU - Akindinov, A.
AU - Al-Turany, M.
AU - Alam, S. N.
AU - Albuquerque, D. S.D.
AU - Aleksandrov, D.
AU - Alessandro, B.
AU - Alfaro Molina, R.
AU - Ali, Y.
AU - Alici, A.
AU - Alkin, A.
AU - Alme, J.
AU - Alt, T.
AU - Altenkamper, L.
AU - Altsybeev, I.
AU - Andrei, C.
AU - Andreou, D.
AU - Andrews, H. A.
AU - Andronic, A.
AU - Angeletti, M.
AU - Anguelov, V.
AU - Anson, C.
AU - Antičić, T.
AU - Antinori, F.
AU - Antonioli, P.
AU - Anwar, R.
AU - Apadula, N.
AU - Aphecetche, L.
AU - Appelshäuser, H.
AU - Arcelli, S.
AU - Arnaldi, R.
AU - Arnold, O. W.
AU - Arsene, I. C.
AU - Arslandok, M.
AU - Audurier, B.
AU - Augustinus, A.
AU - Averbeck, R.
AU - Azmi, M. D.
AU - Badalà, A.
AU - Seger, Janet E.
PY - 2019/3/10
Y1 - 2019/3/10
N2 - In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, dN ch /dη and total charged-particle multiplicity, N ch tot , in Xe–Xe collisions at a centre-of-mass energy per nucleon–nucleon pair of s NN =5.44TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5<η<5. The values of dN ch /dη at mid-rapidity and N ch tot for central collisions, normalised to the number of nucleons participating in the collision (N part ) as a function of s NN follow the trends established in previous heavy-ion measurements. The same quantities are also found to increase as a function of N part , 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 N part . 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%.
AB - In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, dN ch /dη and total charged-particle multiplicity, N ch tot , in Xe–Xe collisions at a centre-of-mass energy per nucleon–nucleon pair of s NN =5.44TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5<η<5. The values of dN ch /dη at mid-rapidity and N ch tot for central collisions, normalised to the number of nucleons participating in the collision (N part ) as a function of s NN follow the trends established in previous heavy-ion measurements. The same quantities are also found to increase as a function of N part , 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 N part . 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%.
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U2 - 10.1016/j.physletb.2018.12.048
DO - 10.1016/j.physletb.2018.12.048
M3 - Article
VL - 790
SP - 35
EP - 48
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -