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Measurements of long-range near-side angular correlations in proton-lead collisions in the forward region
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Two-particle angular correlations are studied in proton-lead collisions at a nucleon&ndash;nucleon centre-of-mass energy of an id="mmlsi1" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931630572X&_mathId=si1.gif&_user=111111111&_pii=S037026931630572X&_rdoc=1&_issn=03702693&md5=0a8d8e511f67e134fb45691102694160">ass="imgLazyJSB inlineImage" height="15" width="88" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S037026931630572X-si1.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">sNN=5 TeVath>an>an>an>, collected with the LHCb detector at the LHC. The analysis is based on data recorded in two beam configurations, in which either the direction of the proton or that of the lead ion is analysed. The correlations are measured in the laboratory system as a function of relative pseudorapidity, Δη, and relative azimuthal angle, Δϕ  , for events in different classes of event activity and for different bins of particle transverse momentum. In high-activity events a long-range correlation on the near side, an id="mmlsi3" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931630572X&_mathId=si3.gif&_user=111111111&_pii=S037026931630572X&_rdoc=1&_issn=03702693&md5=75c717f2912582e62db098e002f741ec" title="Click to view the MathML source">Δϕ&asymp;0an>an class="mathContainer hidden">an class="mathCode">ath altimg="si3.gif" overflow="scroll">athvariant="normal">Δϕ&asymp;0ath>an>an>an>, is observed in the pseudorapidity range an id="mmlsi4" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931630572X&_mathId=si4.gif&_user=111111111&_pii=S037026931630572X&_rdoc=1&_issn=03702693&md5=a06b9f4ff5695a033932b4758c676eee" title="Click to view the MathML source">2.0<η<4.9an>an class="mathContainer hidden">an class="mathCode">ath altimg="si4.gif" overflow="scroll">2.0<η<4.9ath>an>an>an>. This measurement of long-range correlations on the near side in proton-lead collisions extends previous observations into the forward region up to an id="mmlsi5" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S037026931630572X&_mathId=si5.gif&_user=111111111&_pii=S037026931630572X&_rdoc=1&_issn=03702693&md5=a1e692840478c5bad265a0d002117815" title="Click to view the MathML source">η=4.9an>an class="mathContainer hidden">an class="mathCode">ath altimg="si5.gif" overflow="scroll">η=4.9ath>an>an>an>. The correlation increases with growing event activity and is found to be more pronounced in the direction of the lead beam. However, the correlation in the direction of the lead and proton beams are found to be compatible when comparing events with similar absolute activity in the direction analysed.

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