Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV

S. Acharya; J. Adams; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; N. Ahmad; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; J.L.B. Alba; DSD Albuquerque; D. Aleksandrov; B Alessandro; Rafael A. Molina; A. Alici; A. Alkin; Ian Bearden; Lais Ozelin de Lima Pimentel; Christian Alexander Bourjau; Ante Bilandzic; Marek Chojnacki; Jens Jørgen Gaardhøje; Freja Thoresen; Børge Svane Nielsen; bsm989 bsm989; Vojtech Pacik; You Zhou; Vytautas Vislavicius; Katarina Gajdosova; rtc312 rtc312

doi:10.1103/PhysRevC.97.024906

Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV

S. Acharya, J. Adams, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, N. Ahmad, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, J.L.B. Alba, DSD Albuquerque, D. Aleksandrov, B Alessandro, Rafael A. Molina, A. AliciA. Alkin, Ian Bearden, Lais Ozelin de Lima Pimentel, Christian Alexander Bourjau, Ante Bilandzic, Marek Chojnacki, Jens Jørgen Gaardhøje, Freja Thoresen, Børge Svane Nielsen, bsm989 bsm989, Vojtech Pacik, You Zhou, Vytautas Vislavicius, Katarina Gajdosova, rtc312 rtc312

Experimental Particle Physics

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Abstract

The correlations between event-by-event fluctuations of anisotropic flow harmonic amplitudes have been measured in Pb-Pb collisions at sNN=2.76 TeV with the ALICE detector at the Large Hadron Collider. The results are reported in terms of multiparticle correlation observables dubbed symmetric cumulants. These observables are robust against biases originating from nonflow effects. The centrality dependence of correlations between the higher order harmonics (the quadrangular v4 and pentagonal v5 flow) and the lower order harmonics (the elliptic v2 and triangular v3 flow) is presented. The transverse momentum dependences of correlations between v3 and v2 and between v4 and v2 are also reported. The results are compared to calculations from viscous hydrodynamics and a multiphase transport (AMPT) model calculations. The comparisons to viscous hydrodynamic models demonstrate that the different order harmonic correlations respond differently to the initial conditions and the temperature dependence of the ratio of shear viscosity to entropy density (η/s). A small average value of η/s is favored independent of the specific choice of initial conditions in the models. The calculations with the AMPT initial conditions yield results closest to the measurements. Correlations among the magnitudes of v2, v3, and v4 show moderate pT dependence in midcentral collisions. This might be an indication of possible viscous corrections to the equilibrium distribution at hadronic freeze-out, which might help to understand the possible contribution of bulk viscosity in the hadronic phase of the system. Together with existing measurements of individual flow harmonics, the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.

Original language	English
Article number	024906
Journal	Physical Review C
Volume	97
Issue number	2
Number of pages	23
ISSN	2469-9985
DOIs	https://doi.org/10.1103/PhysRevC.97.024906
Publication status	Published - 12 Feb 2018

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PhysRevC.97.024906Final published version, 1.13 MBLicence: CC BY

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Acharya, S., Adams, J., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, N., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Alba, J. L. B., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Molina, R. A., ... rtc312, R. (2018). Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV. Physical Review C, 97(2), Article 024906. https://doi.org/10.1103/PhysRevC.97.024906

Acharya, S, Adams, J, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, N, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Alba, JLB, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Molina, RA, Alici, A, Alkin, A, Bearden, I, Pimentel, LODL, Bourjau, CA, Bilandzic, A, Chojnacki, M, Gaardhøje, JJ, Thoresen, F, Nielsen, BS , bsm989, B, Pacik, V, Zhou, Y, Vislavicius, V, Gajdosova, K & rtc312, R 2018, 'Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV', Physical Review C, vol. 97, no. 2, 024906. https://doi.org/10.1103/PhysRevC.97.024906

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title = "Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV",

abstract = "The correlations between event-by-event fluctuations of anisotropic flow harmonic amplitudes have been measured in Pb-Pb collisions at sNN=2.76 TeV with the ALICE detector at the Large Hadron Collider. The results are reported in terms of multiparticle correlation observables dubbed symmetric cumulants. These observables are robust against biases originating from nonflow effects. The centrality dependence of correlations between the higher order harmonics (the quadrangular v4 and pentagonal v5 flow) and the lower order harmonics (the elliptic v2 and triangular v3 flow) is presented. The transverse momentum dependences of correlations between v3 and v2 and between v4 and v2 are also reported. The results are compared to calculations from viscous hydrodynamics and a multiphase transport (AMPT) model calculations. The comparisons to viscous hydrodynamic models demonstrate that the different order harmonic correlations respond differently to the initial conditions and the temperature dependence of the ratio of shear viscosity to entropy density (η/s). A small average value of η/s is favored independent of the specific choice of initial conditions in the models. The calculations with the AMPT initial conditions yield results closest to the measurements. Correlations among the magnitudes of v2, v3, and v4 show moderate pT dependence in midcentral collisions. This might be an indication of possible viscous corrections to the equilibrium distribution at hadronic freeze-out, which might help to understand the possible contribution of bulk viscosity in the hadronic phase of the system. Together with existing measurements of individual flow harmonics, the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.",

author = "S. Acharya and J. Adams and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and N. Ahmad and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and J.L.B. Alba and DSD Albuquerque and D. Aleksandrov and B Alessandro and Molina, {Rafael A.} and A. Alici and A. Alkin and Ian Bearden and Pimentel, {Lais Ozelin de Lima} and Bourjau, {Christian Alexander} and Ante Bilandzic and Marek Chojnacki and Gaardh{\o}je, {Jens J{\o}rgen} and Freja Thoresen and Nielsen, {B{\o}rge Svane} and bsm989 bsm989 and Vojtech Pacik and You Zhou and Vytautas Vislavicius and Katarina Gajdosova and rtc312 rtc312",

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doi = "10.1103/PhysRevC.97.024906",

language = "English",

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T1 - Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV

AU - Acharya, S.

AU - Adams, J.

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Alba, J.L.B.

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Molina, Rafael A.

AU - Alici, A.

AU - Alkin, A.

AU - Bearden, Ian

AU - Pimentel, Lais Ozelin de Lima

AU - Bourjau, Christian Alexander

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Gaardhøje, Jens Jørgen

AU - Thoresen, Freja

AU - Nielsen, Børge Svane

AU - bsm989, bsm989

AU - Pacik, Vojtech

AU - Zhou, You

AU - Vislavicius, Vytautas

AU - Gajdosova, Katarina

AU - rtc312, rtc312

PY - 2018/2/12

Y1 - 2018/2/12

N2 - The correlations between event-by-event fluctuations of anisotropic flow harmonic amplitudes have been measured in Pb-Pb collisions at sNN=2.76 TeV with the ALICE detector at the Large Hadron Collider. The results are reported in terms of multiparticle correlation observables dubbed symmetric cumulants. These observables are robust against biases originating from nonflow effects. The centrality dependence of correlations between the higher order harmonics (the quadrangular v4 and pentagonal v5 flow) and the lower order harmonics (the elliptic v2 and triangular v3 flow) is presented. The transverse momentum dependences of correlations between v3 and v2 and between v4 and v2 are also reported. The results are compared to calculations from viscous hydrodynamics and a multiphase transport (AMPT) model calculations. The comparisons to viscous hydrodynamic models demonstrate that the different order harmonic correlations respond differently to the initial conditions and the temperature dependence of the ratio of shear viscosity to entropy density (η/s). A small average value of η/s is favored independent of the specific choice of initial conditions in the models. The calculations with the AMPT initial conditions yield results closest to the measurements. Correlations among the magnitudes of v2, v3, and v4 show moderate pT dependence in midcentral collisions. This might be an indication of possible viscous corrections to the equilibrium distribution at hadronic freeze-out, which might help to understand the possible contribution of bulk viscosity in the hadronic phase of the system. Together with existing measurements of individual flow harmonics, the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.

AB - The correlations between event-by-event fluctuations of anisotropic flow harmonic amplitudes have been measured in Pb-Pb collisions at sNN=2.76 TeV with the ALICE detector at the Large Hadron Collider. The results are reported in terms of multiparticle correlation observables dubbed symmetric cumulants. These observables are robust against biases originating from nonflow effects. The centrality dependence of correlations between the higher order harmonics (the quadrangular v4 and pentagonal v5 flow) and the lower order harmonics (the elliptic v2 and triangular v3 flow) is presented. The transverse momentum dependences of correlations between v3 and v2 and between v4 and v2 are also reported. The results are compared to calculations from viscous hydrodynamics and a multiphase transport (AMPT) model calculations. The comparisons to viscous hydrodynamic models demonstrate that the different order harmonic correlations respond differently to the initial conditions and the temperature dependence of the ratio of shear viscosity to entropy density (η/s). A small average value of η/s is favored independent of the specific choice of initial conditions in the models. The calculations with the AMPT initial conditions yield results closest to the measurements. Correlations among the magnitudes of v2, v3, and v4 show moderate pT dependence in midcentral collisions. This might be an indication of possible viscous corrections to the equilibrium distribution at hadronic freeze-out, which might help to understand the possible contribution of bulk viscosity in the hadronic phase of the system. Together with existing measurements of individual flow harmonics, the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.

U2 - 10.1103/PhysRevC.97.024906

DO - 10.1103/PhysRevC.97.024906

M3 - Journal article

SN - 2469-9985

VL - 97

JO - Physical Review C

JF - Physical Review C

IS - 2

M1 - 024906

ER -

Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at root s(NN)=2.76 TeV

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