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Charged-particle multiplicity fluctuations in Pb–Pb collisions at sNN  = 2.76 TeV.

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Title: Charged-particle multiplicity fluctuations in Pb–Pb collisions at sNN  = 2.76 TeV.
Authors: Acharya, S.1 (AUTHOR), Adamová, D.2 (AUTHOR), Adler, A.3 (AUTHOR), Adolfsson, J.4 (AUTHOR), Aglieri Rinella, G.5 (AUTHOR), Agnello, M.6 (AUTHOR), Agrawal, N.7 (AUTHOR), Ahammed, Z.1 (AUTHOR), Ahmad, S.8 (AUTHOR), Ahn, S. U.9 (AUTHOR), Ahuja, I.10 (AUTHOR), Akbar, Z.11 (AUTHOR), Akindinov, A.12 (AUTHOR), Al-Turany, M.13 (AUTHOR), Alam, S. N.14 (AUTHOR), Aleksandrov, D.15 (AUTHOR), Alessandro, B.16 (AUTHOR), Alfanda, H. M.17 (AUTHOR), Alfaro Molina, R.18 (AUTHOR), Ali, B.8 (AUTHOR)
Source: European Physical Journal C -- Particles & Fields. Nov2021, Vol. 81 Issue 11, p1-17. 17p.
Subjects: European Organization for Nuclear Research, Multiplicity (Mathematics), Large Hadron Collider
Abstract: Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at s NN = 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range | η | < 0.8 and transverse momentum 0.2 < p T < 2.0 GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The η and p T dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at s NN = 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range | η | &lt; 0.8 and transverse momentum 0.2 &lt; p T &lt; 2.0 GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The η and p T dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions. [ABSTRACT FROM AUTHOR]
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