Observation of nuclear modification of energy-energy correlators inside jets in heavy ion collisions - INSPIRE

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Observation of nuclear modification of energy-energy correlators inside jets in heavy ion collisions

CMS

Collaboration

Mar 25, 2025

e-Print:

2503.19993 [nucl-ex]

Report number:

CMS-HIN-23-004,
CERN-EP-2025-014

Experiments:

CERN-LHC-CMS

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Abstract: (arXiv)

Energy-energy correlators are constructed by averaging the number of charged particle pairs within jets, weighted by the product of their transverse momenta, as a function of the angular separation of the particles within a pair. They are sensitive to a multitude of perturbative and nonperturbative quantum chromodynamics phenomena in high-energy particle collisions. Using lead-lead data recorded with the CMS detector, energy-energy correlators inside high transverse momentum jets are measured in heavy ion collisions for the first time. The data are obtained at a nucleon-nucleon center-of-mass energy of 5.02 TeV and correspond to an integrated luminosity of 1.70 nb

^{-1}

. A similar analysis is done for proton-proton collisions at the same center-of-mass energy to establish a reference. The ratio of lead-lead to proton-proton energy-energy correlators reveals significant jet substructure modifications in the quark-gluon plasma. The results are compared to different models that incorporate either color coherence or medium response effects, where the two effects predict similar substructure modifications.

Note:

Submitted to Physics Letters B. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-23-004 (CMS Public Pages)

References(91)

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