DOE OSTI · 3420160
Observation of the Jet Diffusion Wake Using Dijets in Heavy-Ion Collisions
Abstract
Energetic quarks and gluons traversing a hot and dense quark-gluon plasma deposit energy and momentum into the medium before hadronizing to collimated sprays of particles, known as jets. This energy-momentum deposition is expected to produce medium responses, collectively known as jet wakes, with “diffusion wake” denoting a depletion of particles in the direction opposite to the propagating jet. The diffusion wake is studied by comparing dijet-hadron correlations measured in lead-lead (PbPb) and proton-proton (pp) collisions. The analysis uses PbPb and pp data recorded at a nucleon-nucleon (NN) center-of-mass energy s NN = 5.02 TeV with the CMS detector at the CERN LHC. By exploring how the dijet-hadron correlation distributions differ for various pseudorapidity separations of the two jets in the dijet, the presence of a jet diffusion wake is firmly established. The diffusion wake signal has a significance greater than 5 standard deviations for charged particles in the transverse momentum range 1 < p T < 2 GeV . The measurements are compared with model predictions with and without jet wake effects, providing new insights into quark-gluon plasma properties and the formation of jet-induced wakes.
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Hayrapetyan, Aram [Yerevan Phys. Inst.], Makarenko, Vladimir [Yerevan Phys. Inst.] (ORCID:0000000284068605), Tumasyan, Armen [Yerevan Phys. 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Observation of the Jet Diffusion Wake Using Dijets in Heavy-Ion Collisions. https://doi.org/10.1103/g49y-8cjl
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