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

2016/09/30 by ALICE Collaboration, J. Adam, D. Adamová +98 · 20 citations
Engineering · Physics and Astronomy · #Astrophysics #Atomic physics #Center (category theory) #Charged particle #Crystallography #Energy (signal processing) #High-Energy Particle Collisions Research #Jet quenching #Nuclear reactor physics and engineering #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudorapidity #Quantum chromodynamics #Quark–gluon plasma #Star (game theory) #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevlett.119.102301

published in Physical Review Letters 119(10), 102301 (American Physical Society) · 18 pages, 4 captioned figures, authors from page 13, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3147

openalex created_date 2016/10/07 · openalex publication_date 2017/09/08 · arxiv created 2017/12/18 · arxiv updated 2017/12/19 · openalex updated_date 2026/08/06

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 (\mathrm\ensuremathΔ\ensuremathη) and azimuthal (\mathrm\ensuremathΔ\ensuremathφ) 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 √s_NN=2.76 TeV. A significant broadening of the peak in the \mathrm\ensuremathΔ\ensuremathη direction at low p_T is found from peripheral to central collisions, which vanishes above 4 GeV/c, while in the \mathrm\ensuremathΔ\ensuremathφ 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.

Citations

• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at √s_NN = 2.76 TeV
• Longitudinal broadening of near-side jets due to parton cascade
• Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at √s_NN= 2.76 TeV
• Momentum broadening in an anisotropic plasma
• Multiphase transport model for relativistic heavy ion collisions
• Long range rapidity correlations and jet production in high energy nuclear collisions
• Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN=2.76 TeV
• Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions atsNN=2.76 TeV

Cited by

• Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at sNN=2.76 TeV