Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV
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Título: | Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV |
Autor/a: | ALICE Collaboration González Ferreiro, Elena |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Física de Partículas Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
Palabras chave: | Hadron-Hadron scattering (experiments) | |
Data: | 2016 |
Editor: | Springer |
Cita bibliográfica: | Adam, J., Adamová, D., Aggarwal, M.M. et al. Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV. J. High Energ. Phys. 2016, 164 (2016). https://doi.org/10.1007/JHEP09(2016)164 |
Resumo: | The elliptic, triangular, quadrangular and pentagonal anisotropic ow coe - cients for , K and p+p in Pb-Pb collisions at p √sNN = 2:76TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identi ed hadrons with reference particles from a di erent pseudorapidity region. E ects not related to the common event symmetry planes (non- ow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained ow coe cients exhibit a clear mass ordering for transverse momentum (pT) values below 3 GeV/c. In the intermediate pT region (3 < pT < 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT < 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the reball using a value of 0.08 for the ratio of shear viscosity to entropy density ( =s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics. |
Versión do editor: | https://doi.org/10.1007/JHEP09(2016)164 |
URI: | http://hdl.handle.net/10347/22149 |
DOI: | 10.1007/JHEP09(2016)164 |
ISSN: | 1029-8479 |
E-ISSN: | 1080-6059 |
Dereitos: | © CERN, for the bene t of the ALICE Collaboration. Article funded by SCOAP3.This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
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© CERN, for the bene t of the ALICE Collaboration. Article funded by SCOAP3.This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
© CERN, for the bene t of the ALICE Collaboration. Article funded by SCOAP3.This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.