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Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV

Publication ,  Journal Article
Adam, J; Adamová, D; Aggarwal, MM; Aglieri Rinella, G; Agnello, M; Agrawal, N; Ahammed, Z; Ahmad, S; Ahn, SU; Aiola, S; Akindinov, A; Alam, SN ...
Published in: Journal of High Energy Physics
September 1, 2016

The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p + p ¯ in Pb-Pb collisions at sNN=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients 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 fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/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.[Figure not available: see fulltext.]

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Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

ISSN

1126-6708

Publication Date

September 1, 2016

Volume

2016

Issue

9

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics
 

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Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., … Bielčíková, J. (2016). Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV. Journal of High Energy Physics, 2016(9). https://doi.org/10.1007/JHEP09(2016)164
Adam, J., D. Adamová, M. M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, et al. “Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV.” Journal of High Energy Physics 2016, no. 9 (September 1, 2016). https://doi.org/10.1007/JHEP09(2016)164.
Adam J, Adamová D, Aggarwal MM, Aglieri Rinella G, Agnello M, Agrawal N, et al. Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV. Journal of High Energy Physics. 2016 Sep 1;2016(9).
Adam, J., et al. “Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV.” Journal of High Energy Physics, vol. 2016, no. 9, Sept. 2016. Scopus, doi:10.1007/JHEP09(2016)164.
Adam J, Adamová D, Aggarwal MM, Aglieri Rinella G, Agnello M, Agrawal N, Ahammed Z, Ahmad S, Ahn SU, Aiola S, Akindinov A, Alam SN, Albuquerque DSD, Aleksandrov D, Alessandro B, Alexandre D, Alfaro Molina R, Alici A, Alkin A, Alme J, Alt T, Altinpinar S, Altsybeev I, Alves Garcia Prado C, An M, Andrei C, Andrews HA, Andronic A, Anguelov V, Antičić T, Antinori F, Antonioli P, Aphecetche L, Appelshäuser H, Arcelli S, Arnaldi R, Arnold OW, Arsene IC, Arslandok M, Audurier B, Augustinus A, Averbeck R, Azmi MD, Badalà A, Baek YW, Bagnasco S, Bailhache R, Bala R, Balasubramanian S, Baldisseri A, Baral RC, Barbano AM, Barbera R, Barile F, Barnaföldi GG, Barnby LS, Barret V, Bartalini P, Barth K, Bartke J, Bartsch E, Basile M, Bastid N, Basu S, Bathen B, Batigne G, Batista Camejo A, Batyunya B, Batzing PC, Bearden IG, Beck H, Bedda C, Behera NK, Belikov I, Bellini F, Bello Martinez H, Bellwied R, Belmont R, Belmont-Moreno E, Beltran LGE, Belyaev V, Bencedi G, Beole S, Berceanu I, Bercuci A, Berdnikov Y, Berenyi D, Bertens RA, Berzano D, Betev L, Bhasin A, Bhat IR, Bhati AK, Bhattacharjee B, Bhom J, Bianchi L, Bianchi N, Bianchin C, Bielčík J, Bielčíková J. Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at √sNN=2.76 TeV. Journal of High Energy Physics. 2016 Sep 1;2016(9).
Journal cover image

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

ISSN

1126-6708

Publication Date

September 1, 2016

Volume

2016

Issue

9

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics