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Van Haevermaet, H.; Zaganidis, N.; Pavlov, B.; Heikkinen, A.; Bloch, D.; Karim, M.; Bondu, O.; Chierici, R.; Contardo, D.; Gouzevitch, M.; Lethuillier, M.; Güth, A.; Walsh, R.; Steinbrück, G.; Wagner-Kuhr, J.; Mertzimekis, T. J.; Horvath, D.; Veszpremi, V.; Ujvari, B.; Saini, L. K.; Khurana, R.; Kumar, V.; Maity, M.; Iaselli, G.; Nuzzo, S.; Benvenuti, A. C.; Cavallo, F. R.; Marcellini, S.; Cappello, G.; Barone, L.; Amapane, N.; Graziano, A.; Jo, M.; Morelos Pineda, A.; Brona, G.; Ferreira Parracho, P. G.; Musella, P.; Gavrilenko, M.; Evstyukhin, S.; Zhokin, A.; Rusakov, S. V.; Grishin, V.; de Trocóniz, J. F.; Gonzalez Caballero, I.; Martinez Rivero, C.; Ball, A. H.; Bialas, W.; Bloch, P.; Janot, P.; Mavromanolakis, G.; Pfeiffer, A.; Rovelli, C.; Gabathuler, K.; Langenegger, U.; Sibille, J.; Lecomte, P.; Sala, L.; Wehrli, L.; Dietz, C.; Hou, W.-S.; Tzeng, Y. M.; Sogut, K.; Sunar Cerci, D.; Kaya, M.; Jackson, J.; Rose, A.; Liu, H.; Babb, J.; Luthra, A.; Padhi, S.; D’Alfonso, M.; Koay, S. A.; Zang, S. L.; Vaughan, J.; Eartly, D. P.; Green, D.; Pordes, R.; Askew, A.; Johnson, K. F.; Onel, Y.; Rappoccio, S.; Tinti, G.; Zhukova, V.; Bolton, T.; Baden, A.; Chan, M.; Luckey, P. D.; Malbouisson, H.; Malik, S.; Wolf, M.; Durkin, L. S.; Killewald, P.; Lujan, P.; Huang, X. T.; Ramirez Vargas, J. E.; Betchart, B.; Bodek, A.; Demortier, L.; Jeong, C.; Sill, A.
The European physical journal. C, Particles and fields, 05/2012, Letnik: 72, Številka: 5Journal Article
Measurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon–nucleon centre-of-mass energy of 2.76 TeV are presented. The results are reported as a function of the particle transverse momenta ( p T ) and collision centrality over a broad range in relative pseudorapidity (Δ η ) and the full range of relative azimuthal angle (Δ ϕ ). The observed two-dimensional correlation structure in Δ η and Δ ϕ is characterised by a narrow peak at (Δ η ,Δ ϕ )≈(0,0) from jet-like correlations and a long-range structure that persists up to at least |Δ η |=4. An enhancement of the magnitude of the short-range jet peak is observed with increasing centrality, especially for particles of p T around 1–2 GeV/ c . The long-range azimuthal dihadron correlations are extensively studied using a Fourier decomposition analysis. The extracted Fourier coefficients are found to factorise into a product of single-particle azimuthal anisotropies up to p T ≈3–3.5 GeV/ c for at least one particle from each pair, except for the second-order harmonics in the most central PbPb events. Various orders of the single-particle azimuthal anisotropy harmonics are extracted for associated particle p T of 1–3 GeV/ c , as a function of the trigger particle p T up to 20 GeV/ c and over the full centrality range.
