Charged-particle multiplicity fluctuations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

Abstract

Measurements of event-by-event fluctuations of charged-particle multiplicities in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range $|\eta |<0.8$ and transverse momentum $0.2<p_{\mathrm{T}}<2.0$ GeV/$c$. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The $\eta$ and $p_{\mathrm{T}}$ 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.

23 pages, 4 captioned figures, 1 captioned table, authors from page 18, published version, figures http://alice-publications.web.cern.ch/node/7089

References in corpus (6)

• Glauber Modeling in High Energy Nuclear Collisions
• Incompressibility in finite nuclei and nuclear matter
• Kurtosis and compressibility near the chiral phase transition
• Baseline study for higher moments of net-charge distribution at RHIC energies
• Multiplicity and pseudorapidity density distributions of charged particles produced in pp, pA and AA collisions at RHIC \& LHC energies
• Scaling Properties of Fluctuation and Correlation Results from PHENIX

Cited by in corpus (4)

• The flair of Higgsflare: Distinguishing electroweak EFTs with $W_L{W}_L\to n\times h$
• Anisotropy of magnetized quark matter
• A generalized definition of the isothermal compressibility in (2+1)-flavor QCD
• Imprints of clustering in multiplicity fluctuations