@article{3160828,
    title = "Studies of azimuthal dihadron correlations in ultra-central PbPb
collisions at=2.76 TeV",
    author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and Hartl, and C. and Hoermann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and and Knuenz, V. and Krammer, M. and Kraetschmer, I. and Liko, D. and and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, and W. and Waltenberger, W. and Wulz, C-E and Mossolov, V. and Shumeiko, N. and and Gonzalez, J. Suarez and Alderweireldt, S. and Bansal, M. and Bansal, and S. and Cornelis, T. and De Wolf, E. A. and Janssen, X. and Knutsson, A. and and Luyckx, S. and Mucibello, L. and Ochesanu, S. and Roland, B. and and Rougny, R. and Van Haevermaet, H. and Van Mechelen, P. and Van Remortel, and N. and Van Spilbeeck, A. and Blekman, F. and Blyweert, S. and D'Hondt, and J. and Heracleous, N. and Kalogeropoulos, A. and Keaveney, J. and Kim, and T. J. and Lowette, S. and Maes, M. and Olbrechts, A. and Strom, D. and and Tavernier, S. and Van Doninck, W. and Van Mulders, P. and Van Onsem, G. and P. and Villella, I. and Caillol, C. and Clerbaux, B. and De Lentdecker, and G. and Favart, L. and Gay, A. P. R. and Leonard, A. and Marage, P. E. and and Mohammadi, A. and Pernie, L. and Reis, T. and Seva, T. and Thomas, and L. and Vander Velde, C. and Vanlaer, P. and Wang, J. and Adler, V. and and Beernaert, K. and Benucci, L. and Cimmino, A. and Costantini, S. and and Dildick, S. and Garcia, G. and Klein, B. and Lellouch, J. and Mccartin, and J. and Rios, A. A. Ocampo and Ryckbosch, D. and Diblen, S. Salva and and Sigamani, M. and Strobbe, N. and Thyssen, F. and Tytgat, M. and Walsh, and S. and Yazgan, E. and Zaganidis, N. and Basegmez, S. and Beluffi, C. and and Bruno, G. and Castello, R. and Caudron, A. and Ceard, L. and Da and Silveira, G. G. and Delaere, C. and du Pree, T. and Favart, D. and and Forthomme, L. and Giammanco, A. and Hollar, J. and Jez, P. and Komm, M. and and Lemaitre, V. and Liao, J. and Militaru, O. and Nuttens, C. and and Pagano, D. and Pin, A. and Piotrzkowski, K. and Popov, A. and and Quertenmont, L. and Selvaggi, M. and Marono, M. Vidal and Garcia, J. M. and Vizan and Beliy, N. and Caebergs, T. and Daubie, E. and Hammad, G. H. and and Alves, G. A. and Correa Martins Junior, M. and Martins, T. and Pol, and M. E. and Souza, M. H. G. and Alda Junior, W. L. and Carvalho, W. and and Chinellato, J. and Custodio, A. and Da Costa, E. 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    journal = "Journal of High Energy Physics",
    year = "2014",
    number = "2",
    publisher = "Springer-Verlag",
    issn = "1126-6708, 1029-8479",
    doi = "10.1007/JHEP02(2014)088",
    keywords = "Relativistic heavy ion physics; Heavy Ions; harmonic flow",
    abstract = "Azimuthal dihadron correlations of charged particles have been measured
in PbPb collisions at = 2.76TeV by the CMS collaboration, using data
from the 2011 LHC heavy-ion run. The data set includes a sample of
ultra-central (0-0.2% centrality) PbPb events collected using a trigger
based on total transverse energy in the hadron forward calorimeters and
the total multiplicity of pixel clusters in the silicon pixel tracker. A
total of about 1.8 million ultra-central events were recorded,
corresponding to an integrated luminosity of 120 mu b -aEuro parts per
thousand 1. The observed correlations in ultra-central PbPb events are
expected to be particularly sensitive to initial-state fluctuations. The
single-particle anisotropy Fourier harmonics, from v (2) to v (6), are
extracted as a function of particle transverse momentum. At higher
transverse momentum, the v (2) harmonic becomes significantly smaller
than the higher-order v (n) (n a parts per thousand yenaEuro parts per
thousand 3). The p (T)-averaged v (2) and v (3) are found to be equal
within 2%, while higher-order v (n) decrease as n increases. The
breakdown of factorization of dihadron correlations into single-particle
azimuthal anisotropies is observed. This effect is found to be most
prominent in the ultra-central PbPb collisions, where the initial-state
fluctuations play a dominant role. A comparison of the factorization
data to hydrodynamic predictions with event-by-event fluctuating initial
conditions is also presented."
}