Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV
We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 8 > p $$trig\atop{T}$$ > 16 GeV/c and associated charged particles of 0.5 > p $$assoc\atop{T}$$ > 10 GeV/c versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb–Pb collisions at s NN =2.76 TeV with ALICE. The new measurements exploit associated charged hadrons down to 0.5 GeV/c, which significantly extends our previous measurement that only used charged hadrons above 3 GeV/c. After subtracting the contributions of the flow background, v 2 to v 5 , the per-trigger yields are extracted for |Δφ| > 0.7 on the near and for |Δφ-π| > 1.1 on the away side. The ratio of per-trigger yields in Pb–Pb to those in pp collisions, I AA , is measured on the near and away side for the 0–10% most central Pb–Pb collisions. On the away side, the per-trigger yields in Pb–Pb are strongly suppressed to the level of I AA ≈0.6 for p $$assoc\atop{T}$$ < 3 GeV/c, while with decreasing momenta an enhancement develops reaching about 5 at low p $$assoc\atop{T}$$. On the near side, an enhancement of I AA between 1.2 at the highest to 1.8 at the lowest p T 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 $$assoc\atop{T}$$ . Only AMPT captures the enhancement at low p $$assoc\atop{T}$$ , both on the near and away side. However, it also underpredicts I AA above 5 GeV/c, in particular on the near-side.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- ALICE Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1402517
- Alternate ID(s):
- OSTI ID: 1379606
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 763 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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