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Knapitsch, A.; Taurok, A.; Van Remortel, N.; Olbrechts, A.; Adler, V.; Gregores, E. M.; Cabrera, A.; Brigljevic, V.; Morovic, S.; Thiebaux, C.; Beauceron, S.; Brun, H.; Cherepanov, V.; Hoehle, F.; Stein, M.; Bobrovskyi, S.; Schum, T.; Barth, C.; Berger, J.; Petrakou, E.; Triantis, F. A.; Horvath, D.; Gupta, R.; Choudhary, B. C.; Ranjan, K.; Shukla, P.; Ganguly, S.; Dugad, S.; Etesami, S. M.; Colaleo, A.; Braibant-Giacomelli, S.; Odorici, F.; Cappello, G.; Meschini, M.; Ragazzi, S.; Ronchese, P.; Bagliesi, G.; Broccolo, G.; Giassi, A.; Palmonari, F.; Venturi, A.; Botta, C.; Staiano, A.; Kim, J. Y.; Song, S.; Sim, K. S.; Castilla-Valdez, H.; Gokieli, R.; Bunin, P.; Perelygin, V.; Smirnov, I.; Vorobyev, An; Vlasov, E.; Gribushin, A.; Azarkin, M.; Rusakov, S. V.; Kachanov, V.; Domínguez Vázquez, D.; Cuevas, J.; Fernandez, M.; Bocci, A.; Gerwig, H.; Piparo, D.; Worm, S. D.; König, S.; Weber, H. A.; Lu, R. -S.; Shiu, J. G.; Polatoz, A.; Hatherell, Z.; Iles, G.; Kopecky, A.; Giordano, F.; Kelley, R.; Apresyan, A.; Bornheim, A.; Salvati, E.; Abdullin, S.; Apollinari, G.; Schwarz, T.; Taylor, L.; Gaultney, V.; Martinez, G.; Whitbeck, A.; Shrestha, S.; Gronberg, J.; Kao, S. C.; Godshalk, A.; Wood, D.; Durkin, L. S.; Hill, C.; Williams, G.; Padley, B. P.; Goldenzweig, P.; Zielinski, M.; Sakuma, T.; Sill, A.; Grogg, K. S.; Klukas, J.; Lanaro, 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 (Δη) and the full range of relative azimuthal angle (Δ$\phi$). The observed two-dimensional correlation structure in Δη and Δ$\phi$ is characterised by a narrow peak at (Δη,Δ$\phi$)≈(0,0) from jet-like correlations and a long-range structure that persists up to at least |Δη|=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.
