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Longitudinal Fluctuations in Heavy-Ion Collisions with the ALICE Detector

Description

Longitudinal fluctuations in A-A collisions are decomposed using Legendre polynomials in the final particle pseudorapidity distribution. The first order longitudinal coefficient, a1, is computed event by event for a single particle distribution for charged tracks, and positive and negative only tracks. Soft tracks were analyzed for 0.2 < pT < 2.0 GeV/c. The pseudorapidity window used is [-0.8,0.8]. Results of a1 are presented for Run 2 Xe-Xe (sqrt(sNN)=5.44TeV) and Pb-Pb (sqrt(sNN)=5.02TeV) data and MC HIJING. A strong forward-backward asymmetry is observed, and the MC HIJING is disfavored when describing this asymmetry.

First longitudinal coefficient a_{1} in Xe-Xe and Pb-Pb collisions as a function of <dNch/deta>
Energy
5.02 TeV
5.44 TeV
System
Pb-Pb
Xe-Xe
Scope: PWG
PWG-CF (Flow and Correlations)
Figure image (.eps)
final_8_0.eps
Figure image (.pdf)
final_8_0.pdf
First longitudinal coefficient a_{1} scaled with sqrt(<dNch/deta>) as a function of <dNch/deta> in Pb-Pb and Xe-Xe collisions
Energy
5.02 TeV
5.44 TeV
System
Pb-Pb
Xe-Xe
Scope: PWG
PWG-CF (Flow and Correlations)
Figure image (.eps)
finalscale_8_0.eps
Figure image (.pdf)
finalscale_8_0.pdf
Charge conservation effect in first longitudinal coefficient a_{1} as a function of <dNch/deta> in Pb-Pb collisions
Energy
5.02 TeV
System
Pb-Pb
Scope: PWG
PWG-CF (Flow and Correlations)
Figure image (.eps)
final_pb_posneg_0.eps
Figure image (.pdf)
final_pb_posneg_0.pdf
Charge conservation effect in first longitudinal coefficient a_{1} as a function of <dNch/deta> in Xe-Xe collisions
Energy
5.44 TeV
System
Xe-Xe
Scope: PWG
PWG-CF (Flow and Correlations)
Figure image (.eps)
final_xe_posneg_0.eps
Figure image (.pdf)
final_xe_posneg_0.pdf