1 Ocak 2016 Dergi makalesi Açık Erişim

CERN İşbirliği

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>CERN İşbirliği</dc:creator>
  <dc:date>2016-01-01</dc:date>
  <dc:description>We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta $8&lt;{p}_{T}^{\mathrm{trig}}&lt;16\text{}\text{GeV}/c$ and associated charged particles of $0.5&lt;{p}_{T}^{\mathrm{assoc}}&lt;10\text{}\text{GeV}/c$ versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb–Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=2.76\text{TeV}$ with ALICE. The new measurements exploit associated charged hadrons down to $0.5\text{}\text{GeV}/c$, which significantly extends our previous measurement that only used charged hadrons above $3\text{}\text{GeV}/c$. After subtracting the contributions of the flow background, ${v}_{2}$ to ${v}_{5}$, the per-trigger yields are extracted for $|\Delta \phi |&lt;0.7$ on the near and for $|\Delta \phi -\pi |&lt;1.1$ on the away side. The ratio of per-trigger yields in Pb–Pb to those in pp collisions, ${I}_{\mathrm{AA}}$, is measured on the near and away side for the $0\text{–}10\text{%}$ most central Pb–Pb collisions. On the away side, the per-trigger yields in Pb–Pb are strongly suppressed to the level of ${I}_{\mathrm{AA}}\approx 0.6$ for ${p}_{T}^{\mathrm{assoc}}&gt;3\text{}\text{GeV}/c$, while with decreasing momenta an enhancement develops reaching about 5 at low ${p}_{T}^{\mathrm{assoc}}$. On the near side, an enhancement of ${I}_{\mathrm{AA}}$ between 1.2 at the highest to 1.8 at the lowest ${p}_{T}^{\mathrm{assoc}}$ is observed. The data are compared to parton-energy-loss predictions of the JEWEL and AMPT event generators, as well as to a perturbative QCD calculation with medium-modified fragmentation functions. All calculations qualitatively describe the away-side suppression at high ${p}_{T}^{\mathrm{assoc}}$. Only AMPT captures the enhancement at low ${p}_{T}^{\mathrm{assoc}}$, both on the near and away side. However, it also underpredicts ${I}_{\mathrm{AA}}$ above $5\text{GeV/}c$, in particular on the near-side.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/107601</dc:identifier>
  <dc:identifier>oai:zenodo.org:107601</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>Physics Letters B 763 C</dc:source>
  <dc:title>Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>