The
centrality dependen
ce of the
charged-parti
cle pseudorapidity density measured with ALICE in Pb–Pb
collisions at
class="mathmlsrc">ce" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000678&_mathId=si1.gif&_user=111111111&_pii=S0370269316000678&_rdoc=1&_issn=03702693&md5=a81ddaf5f532649da1d78a1e95bd4b8a">class="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-S0370269316000678-si1.gif">cript>cal-align:bottom" width="105" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316000678-si1.gif">cript>class="mathContainer hidden">class="mathCode"> over a broad pseudorapidity range is presented. This Letter extends the previous results reported by ALICE to more peripheral
collisions. No strong
change of the overall shape of
charged-parti
cle pseudorapidity density distributions with
centrality is observed, and when normalised to the number of parti
cipating nu
cleons in the
collisions, the evolution over pseudorapidity with
centrality is likewise small. The broad pseudorapidity range (
class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000678&_mathId=si2.gif&_user=111111111&_pii=S0370269316000678&_rdoc=1&_issn=03702693&md5=d532320d1e1e7bc9addbae5aef2f97f0" title="Click to view the MathML source">−3.5<η<5class="mathContainer hidden">class="mathCode">) allows pre
cise estimates of the total number of produ
ced
charged parti
cles whi
ch we find to range from
class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000678&_mathId=si3.gif&_user=111111111&_pii=S0370269316000678&_rdoc=1&_issn=03702693&md5=ac8e6f94f0fcf75971ab8c3febefccbe" title="Click to view the MathML source">162±22(syst.)class="mathContainer hidden">class="mathCode"> to
class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000678&_mathId=si4.gif&_user=111111111&_pii=S0370269316000678&_rdoc=1&_issn=03702693&md5=93a2833ededa215eac67326147c44b4c" title="Click to view the MathML source">17170±770(syst.)class="mathContainer hidden">class="mathCode"> in 80–90% and 0–5%
central
collisions, respe
ctively. The total
charged-parti
cle multipli
city is seen to approximately s
cale with the number of parti
cipating nu
cleons in the
collision. This suggests that hard
contributions to the
charged-parti
cle multipli
city are limited. The results are
compared to models whi
ch des
cribe
class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316000678&_mathId=si5.gif&_user=111111111&_pii=S0370269316000678&_rdoc=1&_issn=03702693&md5=304588943ca60dc2f44d0d6b103554a3" title="Click to view the MathML source">dNch/dηclass="mathContainer hidden">class="mathCode"> at mid-rapidity in the most
central Pb–Pb
collisions and it is found that these models do not
capture all features of the distributions.