Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV - INSPIRE

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Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV

ALICE

Collaboration

Aug 25, 2016

13 pages

Published in:

Phys.Lett.B 763 (2016) 238-250

Published: Dec 10, 2016

e-Print:

1608.07201 [nucl-ex]

DOI:

10.1016/j.physletb.2016.10.048

Report number:

CERN-EP-2016-195

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Elsevier)

We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 83 GeV/c , while with decreasing momenta an enhancement develops reaching about 5 at low pTassoc . On the near side, an enhancement of IAA between 1.2 at the highest to 1.8 at the lowest pTassoc 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 pTassoc . Only AMPT captures the enhancement at low pTassoc , both on the near and away side. However, it also underpredicts IAA above 5 GeV/c , in particular on the near-side.

Note:

26 pages, 5 captioned figures, 1 table, authors from page 20, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3021

correlation: two-particle
pi: trigger
hadron: charged particle
enhancement
suppression
heavy ion: scattering
p p: scattering
transverse momentum
parton: energy loss
fragmentation function

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