Harmonic decomposition of two particle angular correlations in Pb-pb collisions at √sNN=2.76 TeV*
Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at sNN=2.76 TeV for transverse momenta 0.25<pTt,a<15 GeV/c, where pTt>pTa. The shapes of the pair correlation distributions are studied in a va...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
28 January 2012
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| In: |
Physics letters
Year: 2012, Jahrgang: 708, Heft: 3, Pages: 249-264 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2012.01.060 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1016/j.physletb.2012.01.060 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269312001013 
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| Verfasserangaben: | ALICE Collaboration |
MARC
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| 245 | 1 | 0 | |a Harmonic decomposition of two particle angular correlations in Pb-pb collisions at √sNN=2.76 TeV* |c ALICE Collaboration |
| 246 | 3 | 0 | |a sqrt (s_NN) |
| 246 | 3 | 3 | |a Harmonic decomposition of two particle angular correlations in Pb-pb collisions at square root s NN = 2.76 TeV |
| 264 | 1 | |c 28 January 2012 | |
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| 500 | |a The ALICE Collaboration: K. Aamodt, O. Busch, S. Böttger, T. Breitner, H. Engel, P. Glässel, R.Grajcarek, N. Herrmann, U. Kebschull, J. Klein, T. Krawutschke, M.J. Kweon, C. Lara, D. Lohner, J. Mercado Pérez, K. Oyama, Y. Pachmayer, S. Radomski, K. Reygers, R. Schicker, K. Schweda, J. Stachel, J. Ulrich, S. Vallero, J. Wiechula, B. Windelband, P. Zelnicek, A. Zimmermann | ||
| 500 | |a Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt | ||
| 500 | |a Gesehen am 02.11.2018 | ||
| 520 | |a Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at sNN=2.76 TeV for transverse momenta 0.25<pTt,a<15 GeV/c, where pTt>pTa. The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |η|<1.0. Distributions in relative azimuth Δϕ≡ϕt−ϕa are analyzed for |Δη|≡|ηt−ηa|>0.8, and are referred to as “long-range correlations”. Fourier components VnΔ≡〈cos(nΔϕ)〉 are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy VnΔ(pTt,pTa) is fully described in terms of single-particle anisotropies vn(pT) as VnΔ(pTt,pTa)=vn(pTt)vn(pTa). This expectation is tested for 1⩽n⩽5 by applying a global fit of all VnΔ(pTt,pTa) to obtain the best values vn{GF}(pT). It is found that for 2⩽n⩽5, the fit agrees well with data up to pTa∼3-4 GeV/c, with a trend of increasing deviation as pTt and pTa are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25<pT<15 GeV/c range using a single vn(pT) curve; such a description is however approximately possible for 2⩽n⩽5 when pTa<4 GeV/c. For the n=1 harmonic, however, a single v1(pT) curve is not obtained even within the reduced range pTa<4 GeV/c. | ||
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