Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV

S. Acharya; F Acosta; D. Adamova; Jan Adolfsson; MM. Aggarwal; G. Aglieri Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuquerque; D. Aleksandrov; R. Alfaro Molina; Ian Bearden; Ante Bilandzic; bsm989 bsm989; Jens Jørgen Gaardhøje; Lais Ozelin de Lima Pimentel; Børge Svane Nielsen; Freja Thoresen; Marek Chojnacki; You Zhou; Vojtech Pacik; rtc312 rtc312; Christian Alexander Bourjau; Katarina Gajdosova; Vytautas Vislavicius

doi:10.1007/JHEP07(2018)103

Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV

S. Acharya, F Acosta, D. Adamova, Jan Adolfsson, MM. Aggarwal, G. Aglieri Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuquerque, D. Aleksandrov, R. Alfaro Molina, Ian Bearden, Ante Bilandzic, bsm989 bsm989Jens Jørgen Gaardhøje, Lais Ozelin de Lima Pimentel, Børge Svane Nielsen, Freja Thoresen, Marek Chojnacki, You Zhou, Vojtech Pacik, rtc312 rtc312, Christian Alexander Bourjau, Katarina Gajdosova, Vytautas Vislavicius

Experimental Particle Physics

39 Citations (Scopus)

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Abstract

Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at sNN=5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < p_T < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) μb⁻¹ in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v₆) are reported and a detailed comparison among results at the two energies is carried out. The p_T dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form v_n(p_T) ∼ p_T ^n/3 is observed for all flow harmonics at low p_T (0.2 < p_T < 3 GeV/c). At the same time, the ratios v_n/v_m ^{n/ m} are observed to be essentially independent of p_T for most centralities up to about p_T = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v₂), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v₂ distribution P(v₂) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P(v₂), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.[Figure not available: see fulltext.].

Original language	English
Article number	103
Journal	Journal of High Energy Physics
Volume	2018
Issue number	7
Number of pages	39
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP07(2018)103
Publication status	Published - 1 Jul 2018

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Acharya, S., Acosta, F., Adamova, D., Adolfsson, J., Aggarwal, MM., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alfaro Molina, R., Bearden, I., Bilandzic, A., ... Vislavicius, V. (2018). Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV. Journal of High Energy Physics, 2018(7), Article 103. https://doi.org/10.1007/JHEP07(2018)103

Acharya, S, Acosta, F, Adamova, D, Adolfsson, J, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alfaro Molina, R, Bearden, I, Bilandzic, A, bsm989, B , Gaardhøje, JJ, Pimentel, LODL, Nielsen, BS, Thoresen, F, Chojnacki, M, Zhou, Y, Pacik, V, rtc312, R, Bourjau, CA, Gajdosova, K & Vislavicius, V 2018, 'Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV', Journal of High Energy Physics, vol. 2018, no. 7, 103. https://doi.org/10.1007/JHEP07(2018)103

@article{b1e9ea490397408ca73ab65358774a2d,

title = "Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV",

abstract = "Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at sNN=5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < pT < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) μb−1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v6) are reported and a detailed comparison among results at the two energies is carried out. The pT dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form vn(pT) ∼ pT n/3 is observed for all flow harmonics at low pT (0.2 < pT < 3 GeV/c). At the same time, the ratios vn/vm n/ m are observed to be essentially independent of pT for most centralities up to about pT = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v2), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v2 distribution P(v2) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P(v2), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.[Figure not available: see fulltext.].",

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

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doi = "10.1007/JHEP07(2018)103",

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T1 - Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV

AU - Acharya, S.

AU - Acosta, F

AU - Adamova, D.

AU - Adolfsson, Jan

AU - Aggarwal, MM.

AU - Aglieri Rinella, G.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alfaro Molina, R.

AU - Bearden, Ian

AU - Bilandzic, Ante

AU - bsm989, bsm989

AU - Gaardhøje, Jens Jørgen

AU - Pimentel, Lais Ozelin de Lima

AU - Nielsen, Børge Svane

AU - Thoresen, Freja

AU - Chojnacki, Marek

AU - Zhou, You

AU - Pacik, Vojtech

AU - rtc312, rtc312

AU - Bourjau, Christian Alexander

AU - Gajdosova, Katarina

AU - Vislavicius, Vytautas

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at sNN=5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < pT < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) μb−1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v6) are reported and a detailed comparison among results at the two energies is carried out. The pT dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form vn(pT) ∼ pT n/3 is observed for all flow harmonics at low pT (0.2 < pT < 3 GeV/c). At the same time, the ratios vn/vm n/ m are observed to be essentially independent of pT for most centralities up to about pT = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v2), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v2 distribution P(v2) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P(v2), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.[Figure not available: see fulltext.].

AB - Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at sNN=5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < pT < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) μb−1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v6) are reported and a detailed comparison among results at the two energies is carried out. The pT dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form vn(pT) ∼ pT n/3 is observed for all flow harmonics at low pT (0.2 < pT < 3 GeV/c). At the same time, the ratios vn/vm n/ m are observed to be essentially independent of pT for most centralities up to about pT = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v2), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v2 distribution P(v2) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P(v2), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.[Figure not available: see fulltext.].

U2 - 10.1007/JHEP07(2018)103

DO - 10.1007/JHEP07(2018)103

M3 - Journal article

SN - 1126-6708

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 7

M1 - 103

ER -

Energy dependence and fluctuations of anisotropic fow in Pb-Pb collisions at root s(NN)=5:02 and 2:76 TeV

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