Speaker
Description
The momentum distribution in the final state of ion collisions is explained by the collective evolution of the initial energy density in a heavy-ion experiment. Due to the low statistic in a single event, this model is tested by studying many events. Consequently, the observation is convoluted by statistical fluctuation which contains information about the statistical properties of the initial state as well. After surprising observation of flow-like features in small systems, it has been turned out that, at least apparently, the collective picture is applicable for proton-proton and proton-ion collisions. In this talk, we first study the potential information encoded in statistical studies of flow fluctuations. Specifically, we introduce the generalized symmetric cumulants which probe the genuine multi-harmonic correlation. Regarding the flow-like observation in small systems, we study the applicability of hydrodynamics in a different range of system size by employing Gubser flow. After that, we introduce a simple and rather generic model for fluctuations in proton-proton collisions in order to explain the experimentally observed flow harmonics in small systems.
Based on:
[1] C. Mordasini, A. Bilandzic, D. Karakoç, S. F. Taghavi, "Higher order Symmetric Cumulants", [arXiv:1901.06968v2 [nucl-ex]]
[2] S. F. Taghavi, "Smallest QCD Droplet for Hydrodynamic Response and Multiparticle Correlations in pp Collisions", [arXiv:1907.12140v1 [nucl-th]]
| Topic | Heavy Ion Physics |
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