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

J. Adam et al. (ALICE Collaboration)
Phys. Rev. Lett. 119, 102301 – Published 8 September 2017

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<8GeV/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=2.76TeV. A significant broadening of the peak in the Δη direction at low pT is found from peripheral to central collisions, which vanishes above 4GeV/c, while in the Δφ direction the peak is almost independent of centrality. For the 10% most central collisions and 1<pT,assoc<2GeV/c, 1<pT,trig<3GeV/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.

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  • Received 28 September 2016

DOI:https://doi.org/10.1103/PhysRevLett.119.102301

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2017 CERN, for the ALICE Collaboration

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 119, Iss. 10 — 8 September 2017

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