2014/07/01 by Jean-Paul Blaizot, J.-P. Blaizot, Yacine Mehtar-Tani +1 · 3 citations
Chemistry · Physics and Astronomy · #Cascade #Chemistry #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevlett.114.222002
published as Phys. Rev. Lett. 114, 222002 (2015) · 4 pages, 2 figures
arxiv created 2014/07/01 · openalex publication_date 2015/06/05 · arxiv updated 2015/06/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the angular broadening of a medium-induced QCD cascade. We derive the equation that governs the evolution of the average transverse momentum squared of the gluons in the cascade as a function of the medium length, and we solve this equation analytically. Two regimes are identified. For a medium of a not too large size, and for not too soft gluons, the transverse momentum grows with the size of the medium according to standard momentum broadening. The other regime, visible for a medium of a sufficiently large size and very soft gluons, is a regime dominated by multiple branchings: there, the average transverse momentum saturates to a value that is independent of the size of the medium. This structure of the in-medium QCD cascade is, at least qualitatively, compatible with the recent LHC data on dijet asymmetry.