
Multiplicity dependence of symmetric cumulants SC(3,2), SC(4,2) and normalized ratio SC(m,n)/<vm^2><vn^2> 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 four-particle cumulants. The three-subvent method uses the configuration 3,2|-2|-3 + s.c. and 4,2|-2|-3 with least non-flow. The 3,2|-2|-3 + s.c. represents two particle associated with flow harmonic coefficient of 3 and 2 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. Tthe v2{2} is calculated with |\Delta\eta| > 1.4 and v3{2},v4{2} are 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. The measurement in PbPb collisions (PRL123(2019)142301) are also draw in the same plots for comparison.
Keywords: symmetric cumulants
The three-subvent method uses the configuration 3,2|-2|-3 + s.c. and 4,2|-2|-3 with least non-flow. The 3,2|-2|-3 + s.c. represents two particle associated with flow harmonic coefficient of 3 and 2 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. Tthe v2{2} is calculated with |\Delta\eta| > 1.4 and v3{2},v4{2} are calculated with |\Delta\eta| > 1.0.
Sample:
pp sample: all pp sample of LHC16, LHC17, LHC18.
Reco pass: pp pass1