Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations
Abstract To study the microscopic structure of quark–gluon plasma, data from hadronic collisions must be confronted with models that go beyond fluid dynamics. Here, we study a simple kinetic theory model that encompasses fluid dynamics but contains also particle-like excitations in a boost invariant...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-11-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-019-7428-6 |
| _version_ | 1818437118276403200 |
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| author | Aleksi Kurkela Urs Achim Wiedemann Bin Wu |
| author_facet | Aleksi Kurkela Urs Achim Wiedemann Bin Wu |
| author_sort | Aleksi Kurkela |
| collection | DOAJ |
| description | Abstract To study the microscopic structure of quark–gluon plasma, data from hadronic collisions must be confronted with models that go beyond fluid dynamics. Here, we study a simple kinetic theory model that encompasses fluid dynamics but contains also particle-like excitations in a boost invariant setting with no symmetries in the transverse plane and with large initial momentum asymmetries. We determine the relative weight of fluid dynamical and particle like excitations as a function of system size and energy density by comparing kinetic transport to results from the 0th, 1st and 2nd order gradient expansion of viscous fluid dynamics. We then confront this kinetic theory with data on azimuthal flow coefficients over a wide centrality range in PbPb collisions at the LHC, in AuAu collisions at RHIC, and in pPb collisions at the LHC. Evidence is presented that non-hydrodynamic excitations make the dominant contribution to collective flow signals in pPb collisions at the LHC and contribute significantly to flow in peripheral nucleus–nucleus collisions, while fluid-like excitations dominate collectivity in central nucleus–nucleus collisions at collider energies. |
| first_indexed | 2024-12-14T17:19:35Z |
| format | Article |
| id | doaj.art-a58fc7e586604c8785586071e87f02c9 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-14T17:19:35Z |
| publishDate | 2019-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-a58fc7e586604c8785586071e87f02c92022-12-21T22:53:22ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522019-11-01791112910.1140/epjc/s10052-019-7428-6Flow in AA and pA as an interplay of fluid-like and non-fluid like excitationsAleksi Kurkela0Urs Achim Wiedemann1Bin Wu2Theoretical Physics Department, CERNTheoretical Physics Department, CERNTheoretical Physics Department, CERNAbstract To study the microscopic structure of quark–gluon plasma, data from hadronic collisions must be confronted with models that go beyond fluid dynamics. Here, we study a simple kinetic theory model that encompasses fluid dynamics but contains also particle-like excitations in a boost invariant setting with no symmetries in the transverse plane and with large initial momentum asymmetries. We determine the relative weight of fluid dynamical and particle like excitations as a function of system size and energy density by comparing kinetic transport to results from the 0th, 1st and 2nd order gradient expansion of viscous fluid dynamics. We then confront this kinetic theory with data on azimuthal flow coefficients over a wide centrality range in PbPb collisions at the LHC, in AuAu collisions at RHIC, and in pPb collisions at the LHC. Evidence is presented that non-hydrodynamic excitations make the dominant contribution to collective flow signals in pPb collisions at the LHC and contribute significantly to flow in peripheral nucleus–nucleus collisions, while fluid-like excitations dominate collectivity in central nucleus–nucleus collisions at collider energies.http://link.springer.com/article/10.1140/epjc/s10052-019-7428-6 |
| spellingShingle | Aleksi Kurkela Urs Achim Wiedemann Bin Wu Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations European Physical Journal C: Particles and Fields |
| title | Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations |
| title_full | Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations |
| title_fullStr | Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations |
| title_full_unstemmed | Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations |
| title_short | Flow in AA and pA as an interplay of fluid-like and non-fluid like excitations |
| title_sort | flow in aa and pa as an interplay of fluid like and non fluid like excitations |
| url | http://link.springer.com/article/10.1140/epjc/s10052-019-7428-6 |
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