@article{3166340,
    title = "Elliptic flow of identified hadrons in Pb-Pb collisions at
root(NN)-N-s=2.76 Tev",
    author = "Abelev, B. and Adam, J. and Adamova, D. and Aggarwal, M. M. and Agnello, and M. and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and Ahmad, N. and and Ahmed, I. and Ahn, S. U. and Ahn, S. A. and Aimo, I. and Aiola, S. and and Ajaz, M. and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and and Alessandro, B. and Alexandre, D. and Alici, A. and Alkin, A. and Alme, and J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Alves Garcia and Prado, C. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, and J. and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L. and and Appelshaeuser, H. and Arcelli, S. and Armesto, N. and Arnaldi, R. and and Aronsson, T. and Arsene, I. C. and Arslandok, M. and Augustinus, A. and and Averbeck, R. and Awes, T. C. and Azmi, M. D. and Bach, M. and and Badala, A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, and R. and Baldisseri, A. and Pedrosa, F. Baltasar Dos Santos and Baral, R. and C. and Barbera, R. and Barile, F. and Barnafoeldi, G. G. and Barnby, L. and S. and Barret, V. and Bartke, J. and Basile, M. and Bastid, N. and Basu, and S. and Bathen, B. and Batigne, G. and Camejo, A. Batista and Batyunya, and B. and Batzing, P. C. and Baumann, C. and Bearden, I. G. and Beck, H. and and Bedda, C. and Behera, N. K. and Belikov, I. and Bellini, F. and and Bellwied, R. and Belmont-Moreno, E. and Belmont, III, R. and Belyaev, V. and and Bencedi, G. and Beole, S. and Berceanu, I. and Bercuci, A. and and Berdnikov, Y. and Berenyi, D. and Berger, M. E. and Bertens, R. A. and and Berzano, D. and Betev, L. and Bhasin, A. and Bhat, I. R. and Bhati, A. and K. and Bhattacharjee, B. and Bhom, J. and Bianchi, L. and Bianchi, N. and and Bianchin, C. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and and Bjelogrlic, S. and Blanco, F. and Blau, D. and Blume, C. and Bock, and F. and Bogdanov, A. and Boggild, H. and Bogolyubsky, M. and Boehmer, F. and V. and Boldizsar, L. and Bombara, M. and Book, J. and Borel, H. and and Borissov, A. and Bossu, F. and Botje, M. and Botta, E. and Boettger, S. and and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broker, T. and A. and Browning, T. A. and Broz, M. and Bruna, E. and Bruno, G. E. and and Budnikov, D. and Buesching, H. and Bufalino, S. and Buncic, P. and and Busch, O. and Buthelezi, Z. and Caffarri, D. and Cai, X. and Caines, H. and and Diaz, L. Calero and Caliva, A. and Calvo Villar, E. and Camerini, P. and and Carena, F. and Carena, W. and Castellanos, J. Castillo and Casula, and E. A. 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S. and and Windelband, B. and Winn, M. and Yaldo, C. G. and Yamaguchi, Y. and Yang, and H. and Yang, P. and Yang, S. and Yano, S. and Yasnopolskiy, S. and Yi, and J. and Yin, Z. and Yoo, I. -K. and Yushmanov, I. and Zaccolo, V. and and Zach, C. and Zaman, A. and Zampolli, C. and Zaporozhets, S. and and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and Zbroszczyk, H. and and Zgura, I. S. and Zhalov, M. and Zhang, H. and Zhang, X. and Zhang, Y. and and Zhao, C. and Zhigareva, N. and Zhou, D. and Zhou, F. and Zhou, Y. and and Zhou Zhuo and Zhu, H. and Zhu, J. and Zhu, X. and Zichichi, A. and and Zimmermann, A. and Zimmermann, M. B. and Zinovjev, G. and Zoccarato, Y. and and Zyzak, M. and ALICE Collaboration",
    journal = "Journal of High Energy Physics",
    year = "2015",
    number = "6",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP06(2015)190",
    keywords = "Collective flow; Heavy Ions; Particle correlations and fluctuations",
    abstract = "The elliptic flow coefficient (v(2)) of identified particles in Pb-Pb
collisions at root s(NN) = 2.76 TeV was measured with the ALICE detector
at the Large Hadron Collider (LHC). The results were obtained with the
Scalar Product method, a two-particle correlation technique, using a
pseudo-rapidity gap of |Delta eta| > 0.9 between the identified hadron
under study and the reference particles. The v (2) is reported for
pi(+/-), K-+/-, K-S(0), p+(p) over bar, phi, Lambda+(Lambda) over bar,
Xi+(Xi) over bar (+) and Omega(-)+(Omega) over bar (+) in several
collision centralities. In the low transverse momentum (p(T)) region,
p(T) < 3 GeV/c, v(2)(p(T)) exhibits a particle mass dependence
consistent with elliptic flow accompanied by the transverse radial
expansion of the system with a common velocity field. The experimental
data for pi (+/-) and the combined K-+/- and K-S(0) results, are
described fairly well by hydrodynamic calculations coupled to a hadronic
cascade model (VISHNU) for central collisions. However, the same
calculations fail to reproduce the v(2)(p(T)) for p+(p) over bar, phi,
Lambda+(Lambda) over bar, Xi+(Xi) over bar (+). For transverse momentum
values larger than about 3 GeV/c, particles tend to group according to
their type, i.e. mesons and baryons. The present measurements exhibit
deviations from the number of constituent quark (NCQ) scaling at the
level of +/- 20% for p(T) > 3 GeV/c."
}