Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at sNN =2.76 TeV

(ALICE Collaboration)

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The measurement of two-particle angular correlations is a powerful tool to study jet quenching in a pT region inaccessible by direct jet identification. In these measurements pseudorapidity (Δη) and azimuthal (Δφ) differences are used to extract the shape of the near-side peak formed by particles associated with a higher pT trigger particle (1<pT,trig<8 GeV/c). A combined fit of the near-side peak and long-range correlations is applied to the data allowing the extraction of the centrality evolution of the peak shape in Pb-Pb collisions at sNN=2.76 TeV. A significant broadening of the peak in the Δη direction at low pT is found from peripheral to central collisions, which vanishes above 4 GeV/c, while in the Δφ direction the peak is almost independent of centrality. For the 10% most central collisions and 1<pT,assoc<2 GeV/c, 1<pT,trig<3 GeV/c a novel feature is observed: a depletion develops around the center of the peak. The results are compared to pp collisions at the same center of mass energy and ampt model simulations. The comparison to the investigated models suggests that the broadening and the development of the depletion is connected to the strength of radial and longitudinal flow.

Original languageEnglish (US)
Article number102301
JournalPhysical Review Letters
Volume119
Issue number10
DOIs
StatePublished - Sep 8 2017

Fingerprint

collisions
depletion
radial flow
angular correlation
center of mass
actuators
quenching
simulation
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at sNN =2.76 TeV. / (ALICE Collaboration).

In: Physical Review Letters, Vol. 119, No. 10, 102301, 08.09.2017.

Research output: Contribution to journalArticle

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