PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T05 Ultra-Relativistic Nuclear Collisions
Measurement of collective dynamics in small and large systems with the ATLAS detector
S. Bhatta*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: January 22, 2024
Published on: March 21, 2024
Investigating collectivity in proton-proton ($pp$) and proton-nucleus ($p+A$) collisions is essential for understanding the mechanism of formation of Quark Gluon Plasma (QGP). In $pp$ collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 13 TeV, ATLAS has reported no impact on flow coefficients when excluding low-$p_{\mathrm{T}}$ jets, indicating collectivity in small systems does not originate from hard processes. Comparing flow decorrelation in Xe+Xe and $pp$ collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.44 TeV and 5 TeV respectively, underscores the role of sub-nucleonic fluctuations in determining longitudinal energy deposition. ATLAS has also reported a significant correlation between event-wise flow and transverse momentum fluctuations in Xe+Xe and Pb+Pb collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.44 TeV and 5 TeV respectively, emphasizing the role of nuclear structure in accurately describing bulk observables in heavy-ion collisions and provides the first experimental evidence from a high-energy experiment for a significant triaxiality in $^{129}$Xe.
DOI: https://doi.org/10.22323/1.449.0202
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