Multiplicity dependence of nonlinear flow modes in pp and Pb--Pb collisions

Scope: PWG
PWG-CF (Flow and Correlations)
Energy
5.02 TeV
13 TeV
System
p-p
Pb-Pb
Figure Image
Figure image (.eps)
Figure image (.pdf)
Figure Caption

Multiplicity dependence of v_{m,nk}, \chi_{m,nk} and \rho_{m,nk} for pp collisions. Statistical uncertainties are shown as vertical lines and systematic uncertainties as boxes. The observables are measured using multiparticle correlation, with the three-subevent method for the three-particle and four-particle correlation. The three-subvent method uses the configuration 5|-2|-3 + s.c. and 4|-2|-2  with least non-flow. The 5|-2|-3 + s.c. represents one particle associated with flow harmonic coefficient of 5 selected from one side, one particle associated with flow harmonic coefficient of -2 selected from middle, and another particle associated with flow harmonic coefficient of -3 from the other side of the \eta region. The 4|-2|-2 + s.c. is similar. The \rho_{m,nk} is v_{m,nk}/v{m}{2}, where the v{m}{2} is calculated with |\Delta\eta| > 1.0. Data are compared with PYTHIA 8 simulations and impact-parameter-Glasma, MUSIC, and ultra relativistic quantum molecular dynamics (IP-Glasma+MUSIC+UrQMD) calculations. The width of the band represents the statistical uncertainty of the model. 

Detail description

Keywords: nonlinear flow modes

The three-subvent method uses the configuration 5|-2|-3 + s.c. and 4|-2|-2  with least non-flow. The 5|-2|-3 + s.c. represents one particle associated with flow harmonic coefficient of 5 selected from one side, one particle associated with flow harmonic coefficient of -2 selected from middle, and another particle associated with flow harmonic coefficient of -3 from the other side of the \eta region. The 4|-2|-2 + s.c. is similar. 

The \rho_{m,nk} is v_{m,nk}/v{m}{2}, where the v{m}{2} is calculated with |\Delta\eta| > 1.0. 

Sample:

pp sample: all pp sample of LHC16, LHC17, LHC18.

PbPb sample: LHC15o.

Reco pass: pp pass1, PbPb pass2