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A generalized picture of colour decoherence in dense QCD media
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abstract
We revisit the calculation of the soft gluon emission probability off a colour-singlet $q\bar q$ system that evolves in a quark-gluon plasma. The $q\bar q$ antenna is created in the presence of a medium and then emits a soft gluon outside. The gluon emission probability is modified with respect to the vacuum baseline due to interactions with the medium during the formation of the antenna and its propagation. Previous studies disregarded the former effect and found that the medium modification to the interference pattern of the antenna was controlled by the so-called critical angle $\theta_c$, that exclusively depends on medium properties. We find that accounting for medium interactions during the antenna formation enhances the total rate of emissions off the $q\bar q$ antenna. Interestingly, it also promotes the notion of a critical angle to a dynamic quantity, denoted $\tilde\theta_c$, that depends on both the medium and the antenna properties and is thus different for every splitting. As a consequence, depending on the region of parameter space, colour decoherence can either be delayed or accelerated with respect to previous estimates.
Forward citations
Cited by 7 Pith papers
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Finite Formation Time Antenna Radiation: Color Spectators Break Single-Emitter BDMPS-Z
Medium interactions during the finite formation time of a color-singlet q-qbar pair create spectator-leg correlations that make the direct gluon-emission contribution deviate from the single-emitter BDMPS-Z spectrum.
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Factorization of the triple-collinear $q \to qc\bar{c}$ splitting function at first order in opacity
At first order in opacity, the medium-modified q->q c cbar splitting function factorizes into products of q->q g and g->c cbar splitting functions in three strongly ordered collinear limits.
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Visualizing How the Structure of Large-Radius Jets Shapes Their Wakes
Hybrid Model simulations show ATLAS large-radius jet data rule out fully coherent jet energy loss, and low-pT jet-shape observables can visualize merging subjet wakes.
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Gluon radiation from a QCD antenna with realistic parton-medium interactions
The in-medium antenna gluon spectrum is obtained by numerical solution of Dyson-type equations that fully resum multiple scatterings for Yukawa and HTL rates, without harmonic-oscillator or opacity truncations.
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Quantum simulating multi-particle processes in high energy nuclear physics: dijet production and color (de)coherence
A quantum-circuit framework maps partonic cross-sections for multi-particle QCD processes in media, benchmarked on dipole formation and antenna radiation at leading order.
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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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Theory Summary
A conference summary paper reports selected theory results from Quark Matter 2025 in heavy-ion physics, with no new original research.
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