Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Heavy-Ion Collisions and QCD Phases XIII
HK 65.2: Vortrag
Donnerstag, 31. März 2022, 16:15–16:30, HK-H1
New developments in flow analyses with multiparticle > correlations in ALICE and CBM — •Ante Bilandzic for the CBM collaboration — Technical University of Munich, Germany
Anisotropic flow measurements in small collision systems with multi-particle azimuthal correlations are not reliable, since correlation techniques are a precision tool only in an environment characterized by large multiplicities and large flow values. We present the first analytic results for combinatorial background in multi-particle azimuthal correlations, and demonstrate that for small multiplicities this contribution is not negligible. We show that the analytic solutions for the combinatorial background are universal as they can be written generically in terms of multiplicity-dependent combinatorial weights and marginal probability density functions of starting multivariate distribution. We conclude that the observed universality of flow measurements in pp, p–Pb and peripheral Pb–Pb collisions at LHC can be attributed solely to the interplay between nonflow correlations and combinatorial background, which always exhibits universal scaling as a function of multiplicity.
We present the feasibility study of using correlation techniques in flow analyses in the CBM experiment at FAIR. The first results for the flow harmonics estimated with multiparticle cumulants, vn{k}, and the multiharmonic flow correlations obtained with symmetric cumulants, SC(m,n), are presented. We test the scaling of both statistical and systematical uncertainties for these observables in a fixed-target environment characterized by small multiplicities.