Longitudinal Flow Decorrelations in Xe + Xe Collisions at √s<sub>NN</sub> = 5.44 TeV with the ATLAS Detector
The first measurement of longitudinal decorrelations of harmonic flow amplitudes v<sub>n</sub> for n = 2-4 in Xe + Xe collisions at √s<sub>NN</sub> = 5.44 TeV is obtained using 3 μb⁻¹ of data with the ATLAS detector at the LHC. The decorrelation signal for v₃ and v₄ is foun...
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| Autores principales: | , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2021
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/142274 |
| Aporte de: |
| Sumario: | The first measurement of longitudinal decorrelations of harmonic flow amplitudes v<sub>n</sub> for n = 2-4 in Xe + Xe collisions at √s<sub>NN</sub> = 5.44 TeV is obtained using 3 μb⁻¹ of data with the ATLAS detector at the LHC. The decorrelation signal for v₃ and v₄ is found to be nearly independent of collision centrality and transverse momentum (p<sub>T</sub>) requirements on final-state particles, but for v₂ a strong centrality and p<sub>T</sub> dependence is seen. When compared with the results from Pb + Pb collisions at √s<sub>NN</sub> = 5.02 TeV, the longitudinal decorrelation signal in midcentral Xe + Xe collisions is found to be larger for v₂, but smaller for v₃. Current hydrodynamic models reproduce the ratios of the v<sub>n</sub> measured in Xe + Xe collisions to those in Pb + Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe + Xe and Pb + Pb. The results on the system-size dependence provide new insights and an important lever arm to separate effects of the longitudinal structure of the initial state from other early and late time effects in heavy-ion collisions. |
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