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Soft probes of p+Pb and Pb+Pb collisions in the ATLAS experiment at the LHC
Collective flow and azimuthal correlation measurements of particles in the $p_T$ region $<\approx$ 10 GeV provide valuable information in constraining the initial conditions and expansion dynamics of the system produced in heavy-ion collisions. ATLAS collaboration has recently measured correlatio...
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Lenguaje: | eng |
Publicado: |
2014
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1088/1742-6596/612/1/012060 http://cds.cern.ch/record/1978680 |
Sumario: | Collective flow and azimuthal correlation measurements of particles in the $p_T$ region $<\approx$ 10 GeV provide valuable information in constraining the initial conditions and expansion dynamics of the system produced in heavy-ion collisions. ATLAS collaboration has recently measured correlations between flow harmonics in Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, using an event-shape selection procedure, and has separated the components arising from linear and non-linear hydrodynamic evolution in higher order harmonics ($v_4$ and $v_5$). A brief overview of these results are presented in this proceedings. Recently, azimuthal correlations extending to large pseudorapidity differences ('ridge'), similar to that observed in heavy-ion collisions, was observed in p+Pb collisions at LHC. This proceedings also present a measurement of the Fourier harmonics associated with the ridge correlations ($v_1$ to $v_5$) in $p$+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. The results are compared with $v_n$ in Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with similar event multiplicities. Reasonable agreement is observed after accounting for the difference in the average $p_T$ of particles produced in the two collision systems, consistent with a recent hydrodynamic calculation. |
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