Charged-particle multiplicity fluctuations in Pb-Pb collisions at √s<sub>NN</sub>=2.76 TeV



Acharya, S, Adamova, D, Adler, A, Adolfsson, J, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU
et al (show 1013 more authors) (2021) Charged-particle multiplicity fluctuations in Pb-Pb collisions at √s<sub>NN</sub>=2.76 TeV. EUROPEAN PHYSICAL JOURNAL C, 81 (11). 1012-. ISSN 1434-6044, 1434-6052

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Abstract

<jats:title>Abstract</jats:title><jats:p>Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at <jats:inline-formula><jats:alternatives><jats:tex-math>$$\sqrt{s_{\mathrm {NN}}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mi>NN</mml:mi> </mml:msub> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula>  <jats:inline-formula><jats:alternatives><jats:tex-math>$$=$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>=</mml:mo> </mml:math></jats:alternatives></jats:inline-formula> 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range <jats:inline-formula><jats:alternatives><jats:tex-math>$$|\eta |&lt;0.8$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>|</mml:mo> <mml:mi>η</mml:mi> <mml:mo>|</mml:mo> <mml:mo>&lt;</mml:mo> <mml:mn>0.8</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> and transverse momentum <jats:inline-formula><jats:alternatives><jats:tex-math>$$0.2&lt; p_{\mathrm{T}} &lt; 2.0$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>0.2</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msub> <mml:mi>p</mml:mi> <mml:mi>T</mml:mi> </mml:msub> <mml:mo>&lt;</mml:mo> <mml:mn>2.0</mml:mn> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula> GeV/<jats:italic>c</jats:italic>. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The <jats:inline-formula><jats:alternatives><jats:tex-math>$$\eta $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>η</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> and <jats:inline-formula><jats:alternatives><jats:tex-math>$$p_{\mathrm{T}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mi>T</mml:mi> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> 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.</jats:p>

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 12 May 2022 14:58
Last Modified: 06 Dec 2024 21:25
DOI: 10.1140/epjc/s10052-021-09784-4
Open Access URL: https://link.springer.com/article/10.1140/epjc/s10...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3154691