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1.	Abbas, E., et al. (author) J/psi Elliptic Flow in Pb-Pb Collisions at root s(NN)=2.76 TeV 2013 In: Physical Review Letters. - 1079-7114. ; 111:16 Journal article (peer-reviewed)abstract We report on the first measurement of inclusive J/psi elliptic flow v(2) in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at root s(NN) = 2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/psi v(2) on the collision centrality and on the J/psi transverse momentum is studied in the range 0 <= p(T) < 10 GeV/c. For semicentral Pb-Pb collisions at root s(NN) = 2.76 TeV, an indication of nonzero v(2) is observed with a largest measured value of v(2) = 0.116 +/-0.046(stat) +/- 0.029(syst) for J/psi in the transverse momentum range 2 <= p(T) < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/psi nuclear modification factor and favors the scenario of a significant fraction of J/psi production from charm quarks in a deconfined partonic phase.
2.	Abelev, B., et al. (author) Centrality dependence of pi, K, and p production in Pb-Pb collisions at root s(NN)=2.76 TeV 2013 In: Physical Review C (Nuclear Physics). - 0556-2813. ; 88:4 Journal article (peer-reviewed)abstract In this paper measurements are presented of pi(+/-), K-+/-, p, and (p) over bar production at midrapidity (vertical bar y vertical bar < 0.5), in Pb-Pb collisions at root s(NN) = 2.76 TeV as a function of centrality. The measurement covers the transverse-momentum (p(T)) range from 100, 200, and 300 MeV/c up to 3, 3, and 4.6 GeV/c for pi, K, and p, respectively. The measured p(T) distributions and yields are compared to expectations based on hydrodynamic, thermal and recombination models. The spectral shapes of central collisions show a stronger radial flow than measured at lower energies, which can be described in hydrodynamic models. In peripheral collisions, the p(T) distributions are not well reproduced by hydrodynamic models. Ratios of integrated particle yields are found to be nearly independent of centrality. The yield of protons normalized to pions is a factor similar to 1.5 lower than the expectation from thermal models.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Silvermyr, D. (2); Oskarsson, Anders (2); Stenlund, Evert (2); Kretz, M. (2); Lee, S. C. (2); Li, S. (2); show more...; Yamaguchi, Y. (2); Yang, H. (2); Zhang, H. (2); Zhang, X. (2); Zhu, H. (2); Zhu, J. (2); Zhou, Y. (2); Weber, M. (2); Pedrosa, F. Baltasar ... (2); Gupta, A. (2); Sharma, S. (2); Ivanov, A. (2); Podesta-Lerma, P. L. ... (2); Yang, S. (2); Roy, P. (2); Adamova, D. (2); Rinella, G. Aglieri (2); Agocs, A. G. (2); Ahammed, Z. (2); Ahmad, N. (2); Ahn, S. U. (2); Akindinov, A. (2); Aleksandrov, D. (2); Alessandro, B. (2); Alici, A. (2); Alme, J. (2); Alt, T. (2); Altini, V. (2); Altinpinar, S. (2); Andrei, C. (2); Andronic, A. (2); Anson, C. (2); Anticic, T. (2); Antinori, F. (2); Antonioli, P. (2); Aphecetche, L. (2); Appelshaeuser, H. (2); Arcelli, S. (2); Arend, A. (2); Armesto, N. (2); Arnaldi, R. (2); Aronsson, T. (2); Arsene, I. C. (2); Asryan, A. (2); show less...

University: Lund University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2013 (2)

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