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Forward-central two-particle correlations in p-Pb collisions at
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文摘
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (k to view the MathML source">2.5<|η|<4.0) and associated particles in the central range (k to view the MathML source">|η|<1.0) are measured with the ALICE detector in p–Pb collisions at a nucleon–nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (k to view the MathML source">pT) dependence in p-going (p–Pb) and Pb-going (Pb–p) configurations, with the Pb-going coefficients larger by about k to view the MathML source">16±6%, rather independent of k to view the MathML source">pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different k to view the MathML source">pT and η   dependence than observed in the data. The results are sensitive to the parent particle k to view the MathML source">v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at k to view the MathML source">pT>2 GeV/c.

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