Forward-central two-particle correlations in p-Pb collisions at
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- 作者：ALICE Collaboration
- 刊名：Physics Letters B
- 出版年：2016
- 出版时间：10 February 2016
- 年：2016
- 卷：753
- 期：Complete
- 页码：126-139
- 全文大小：1148 K
文摘
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (pan id="mmlsi2" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si2.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=50991944959a5ad100c5360a61869b8d" title="Click to view the MathML source">2.5<|η|<4.0 pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>) and associated particles in the central range (pan id="mmlsi103" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si103.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=b01ed631e008a411b364a8e6e4139d2d" title="Click to view the MathML source">|η|<1.0 pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>) 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 (pan id="mmlsi104" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si104.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=f4ce2793cefb176f0b90ceb0fcccb1da" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>) dependence in p-going (p–Pb) and Pb-going (Pb–p) configurations, with the Pb-going coefficients larger by about pan id="mmlsi5" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si5.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=10f74ce3ddd1cfa42ebdb4609bf9e05c" title="Click to view the MathML source">16±6% pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>, rather independent of pan id="mmlsi104" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si104.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=f4ce2793cefb176f0b90ceb0fcccb1da" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pan id="mmlsi104" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si104.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=f4ce2793cefb176f0b90ceb0fcccb1da" title="Click to view the MathML source">pT pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> and η dependence than observed in the data. The results are sensitive to the parent particle pan id="mmlsi6" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si6.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=a35fbe0e8280b9de20a9c07b54c2d804" title="Click to view the MathML source">v2 pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan> and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pan id="mmlsi101" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315009533&_mathId=si101.gif&_user=111111111&_pii=S0370269315009533&_rdoc=1&_issn=03702693&md5=ca005e5855bf7c0f4b342410a3237bb5" title="Click to view the MathML source">pT>2 GeV/c pan>pan class="mathContainer hidden">pan class="mathCode"> pan> pan> pan>.