Speaker
Description
Symmetric cumulants $sc_{m,n}$, the ratios of azimuthal correlation factorization breaking $r_n$, and the Pearson correlation coefficient $\rho_2 \left ( c_2\{2\}, [p] \right ) $ are powerful probes to study the nature of fluctuations in the quark-gluon plasma and the origin of collectivity in small collision systems. While hydrodynamic models predict $r_3 \leq 1$, experimental data from CMS in p-Pb collisions exhibit $r_3 > 1$. Additionally, the state-of-the-art model IP-Glasma+MUSIC+UrQMD predicts a negative correlation for $\rho_2$ within certain multiplicity intervals, in stark contrast to the positive correlation measured recently by ALICE. These two long-standing discrepancies present a clear puzzle in the interpretation of small-system collectivity. We calculated these flow observables within the TMC framework and compared them with the ATLAS, CMS, and ALICE $p$+$p$ and $p$+Pb data. Our results are found to be in good agreement with the data. This work will provide new insights into the origin of collectivity in small colliding systems.
| 请选择分会 | 高能重离子物理 |
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