Angular Structure of the In-Medium QCD Cascade - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Physical Review Letters Year : 2015

Angular Structure of the In-Medium QCD Cascade


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 data on dijet asymmetry.

Dates and versions

cea-01197331 , version 1 (11-09-2015)



Jean-Paul Blaizot, Y. Mehtar-Tani, M. a. c. Torres. Angular Structure of the In-Medium QCD Cascade. Physical Review Letters, 2015, 114, pp.222002. ⟨10.1103/PhysRevLett.114.222002⟩. ⟨cea-01197331⟩
43 View
0 Download



Gmail Facebook X LinkedIn More