Pseudorapidity dependence of the anisotropic flow of charged particles in Pb-Pb collisions at
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We present measurements of the elliptic (an id="mmlsi2" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si2.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=9ca06101309bad52b1ff201bcbd21958" title="Click to view the MathML source">v2an>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">athvariant="normal">v2ath>an>an>an>), triangular (an id="mmlsi3" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si3.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=4285627d45ccdda4c0d45ff7ed4a256b" title="Click to view the MathML source">v3an>an class="mathContainer hidden">an class="mathCode">ath altimg="si3.gif" overflow="scroll">athvariant="normal">v3ath>an>an>an>) and quadrangular (an id="mmlsi4" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si4.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=afabd775fa7380dd028f231d672a093d" title="Click to view the MathML source">v4an>an class="mathContainer hidden">an class="mathCode">ath altimg="si4.gif" overflow="scroll">athvariant="normal">v4ath>an>an>an>) anisotropic azimuthal flow over a wide range of pseudorapidities (an id="mmlsi5" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si5.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=8a85b44dae8fb199e19945be549092d8" title="Click to view the MathML source">−3.5<η<5an>an class="mathContainer hidden">an class="mathCode">ath altimg="si5.gif" overflow="scroll">3.5<η<5ath>an>an>an>). The measurements are performed with Pb&ndash;Pb collisions at an id="mmlsi1" class="mathmlsrc"><a title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si1.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=d8ce3f723832d73f2f75919ffd39233c">ass="imgLazyJSB inlineImage" height="15" width="105" 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-S0370269316303586-si1.gif">a>an class="mathContainer hidden">an class="mathCode">ath altimg="si1.gif" overflow="scroll">sathvariant="normal">NN=2.76 TeVath>an>an>an> using the ALICE detector at the Large Hadron Collider (LHC). The flow harmonics are obtained using two- and four-particle correlations from nine different centrality intervals covering central to peripheral collisions. We find that the shape of an id="mmlsi6" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si6.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=75251f1f46549c175e779ff2b4ae8a8d" title="Click to view the MathML source">vn(η)an>an class="mathContainer hidden">an class="mathCode">ath altimg="si6.gif" overflow="scroll">athvariant="normal">vnalse">(ηalse">)ath>an>an>an> is largely independent of centrality for the flow harmonics an id="mmlsi7" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si7.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=ea9a291dd8beedf88a13c9103c79334a" title="Click to view the MathML source">n=2&ndash;4an>an class="mathContainer hidden">an class="mathCode">ath altimg="si7.gif" overflow="scroll">n=2&ndash;4ath>an>an>an>, however the higher harmonics fall off more steeply with increasing an id="mmlsi8" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si8.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=8f072ec63cf8a21187020234d0a227ae" title="Click to view the MathML source">|η|an>an class="mathContainer hidden">an class="mathCode">ath altimg="si8.gif" overflow="scroll">alse">|ηalse">|ath>an>an>an>. We assess the validity of extended longitudinal scaling of an id="mmlsi2" class="mathmlsrc">an class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316303586&_mathId=si2.gif&_user=111111111&_pii=S0370269316303586&_rdoc=1&_issn=03702693&md5=9ca06101309bad52b1ff201bcbd21958" title="Click to view the MathML source">v2an>an class="mathContainer hidden">an class="mathCode">ath altimg="si2.gif" overflow="scroll">athvariant="normal">v2ath>an>an>an> by comparing to lower energy measurements, and find that the higher harmonic flow coefficients are proportional to the charged particle densities at larger pseudorapidities. Finally, we compare our measurements to both hydrodynamical and transport models, and find they both have challenges when it comes to describing our data.

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