Forward-central two-particle correlations in p-Pb collisions at
详细信息    查看全文
文摘
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (doc=1&_issn=03702693&md5=50991944959a5ad100c5360a61869b8d" title="Click to view the MathML source">2.5<|η|<4.0) and associated particles in the central range (doc=1&_issn=03702693&md5=b01ed631e008a411b364a8e6e4139d2d" title="Click 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 (doc=1&_issn=03702693&md5=f4ce2793cefb176f0b90ceb0fcccb1da" title="Click 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 doc=1&_issn=03702693&md5=10f74ce3ddd1cfa42ebdb4609bf9e05c" title="Click to view the MathML source">16±6%, rather independent of doc=1&_issn=03702693&md5=f4ce2793cefb176f0b90ceb0fcccb1da" title="Click 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 doc=1&_issn=03702693&md5=f4ce2793cefb176f0b90ceb0fcccb1da" title="Click to view the MathML source">pT and η   dependence than observed in the data. The results are sensitive to the parent particle doc=1&_issn=03702693&md5=a35fbe0e8280b9de20a9c07b54c2d804" title="Click to view the MathML source">v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at doc=1&_issn=03702693&md5=ca005e5855bf7c0f4b342410a3237bb5" title="Click to view the MathML source">pT>2 GeV/c.
NGLC 2004-2010.National Geological Library of China All Rights Reserved.
Add:29 Xueyuan Rd,Haidian District,Beijing,PRC. Mail Add: 8324 mailbox 100083
For exchange or info please contact us via email.