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A Coherent View of the Quark-Gluon Plasma from Energy Correlators
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The ability to measure detailed aspects of the substructure of high-energy jets traversing the quark-gluon plasma (QGP) has provided a new window into its internal dynamics. However, drawing robust conclusions from traditional jet substructure observables has been difficult. In this manuscript we expand on a new approach to jet substructure in heavy-ion collisions based on the study of correlation functions of energy flow operators (energy correlators). We compute the two-point energy correlator of an in-medium massless quark jet and perform a detailed numerical analysis of the produced spectra. Our calculation incorporates vacuum radiation resummed at next-to-leading log accuracy together with the leading order contribution in medium-induced splittings evaluated through the BDMPS-Z multiple scattering and GLV single scattering formalisms for a static brick of QGP. Our analysis demonstrates how particular features of the modifications of in-medium splittings are imprinted in the correlator spectra, particularly showing how energy correlators may be used to extract the onset of colour coherence. We further present a comprehensive discussion on the accuracy and limitations of our study emphasizing how it can be systematically improved. This work sets the foundations for a rich program studying energy correlators in heavy-ion collisions.
Forward citations
Cited by 12 Pith papers
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Constraining the Resolution Length of Quark-Gluon Plasma with New Jet Substructure Measurements
Jet substructure measurements from ALICE and ATLAS, modeled with the Hybrid Model, disfavor both fully coherent and fully incoherent energy loss, implying a finite QGP resolution length near 1/(pi T).
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Factorization and Resummation for the Nearside Energy-Energy Correlators
A new all-order resummation formula in Fourier b_T-space for the nearside energy-energy correlator, derived from di-hadron fragmentation functions, matches fixed-order calculations and predicts a small-angle turnover.
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Giving wake to energy-energy correlators: Hydrodynamic response on the celestial sphere
The medium response contribution to the jet energy-energy correlator scales as dSigma/dtheta proportional to theta at small angles and can qualitatively reproduce the large-angle enhancement seen in PbPb-to-pp EEC mea...
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Simple Scaling Laws for Energy Correlators in Nuclear Matter
The leading nuclear modification of the two-point energy correlator in A-A and p-A collisions is a twist-4 light-ray operator contribution, giving an EEC ratio of 1 + a theta^2.
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Particle Correlations in Jets
Subtracting the product of single-particle energy flows from the energy-energy correlator isolates genuine two-particle correlations in jets, as demonstrated with PYTHIA.
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Analysis note: measurement of energy-energy correlator in $e^{+}e^{-}$ collisions at $91$ GeV with archived ALEPH data
A measurement of the two-point energy-energy correlator in e+e− collisions at the Z pole using archived ALEPH data, with improved precision at small and large angles compared to previous LEP results.
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What is the Quark-Gluon Plasma made of?
The quark-gluon plasma is best described as a strongly coupled liquid of massive, very short-lived quark and gluon quasiparticles, with sound (phonon) modes becoming the most well-defined collective excitation at low momenta.
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