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Multiple Collisions and Induced Gluon Bremsstrahlung in QCD

9 Pith papers cite this work. Polarity classification is still indexing.

9 Pith papers citing it
abstract

Induced soft gluon bremsstrahlung associated with multiple collisions is calculated via perturbative QCD. We derive the non-abelian analog of the Landau-Pomeranchuk effect that suppresses induced soft radiation with formation times exceeding the mean free path, $\lambda$. The dependence of the suppression effect on the $SU(N)$ representation of the jet parton as well as the kinematic variables is expressed through a radiation formation factor. Unlike in QED, the finite contribution from the small $x$ regime in QCD leads to an approximately constant radiative energy loss per unit length, $dE/dz\propto \mu^2$, in the high energy limit that is sensitive to the infrared screening scale, $\mu$, of the medium. As a function of the dimensionless parameter $\zeta=\lambda \mu^2/E$, we show furthermore how the energy dependence of $dE/dz$ evolves from the above constant for $\zeta\ll 1$ to the more familiar (Bethe-Heitler) linear dependence for $\zeta \gg 1$.

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2026 5 2025 4

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representative citing papers

Jet Charge with Global Event Shapes: Probing Quark Flavor Dynamics

hep-ph · 2025-12-04 · unverdicted · novelty 7.0

A factorization theorem is derived for the joint measurement of 1-jettiness and jet charge in DIS, introducing a new universal charged jet function that enhances quark flavor separation in initial-state PDFs and probes final-state hadronization.

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