Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at √<i>S<sub>NN</sub></i>=2.76 TeV



Adam, J, Adamova, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Aiola, S
et al (show 995 more authors) (2017) Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at √<i>S<sub>NN</sub></i>=2.76 TeV. PHYSICAL REVIEW LETTERS, 119 (10). 102301-.

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Abstract

The measurement of two-particle angular correlations is a powerful tool to study jet quenching in a p_{T} 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 p_{T} trigger particle (1<p_{T,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 sqrt[s_{NN}]=2.76  TeV. A significant broadening of the peak in the Δη direction at low p_{T} 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<p_{T,assoc}<2  GeV/c, 1<p_{T,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.

Item Type: Article
Uncontrolled Keywords: ALICE Collaboration
Depositing User: Symplectic Admin
Date Deposited: 06 Nov 2017 07:24
Last Modified: 06 Oct 2023 18:06
DOI: 10.1103/PhysRevLett.119.102301
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3011518