1. Angular Structure of the In-Medium QCD Cascade.
- Author
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Blaizot, J.-P., Mehtar-Tani, Y., and Torres, M. A. C.
- Subjects
- *
ANGULAR momentum (Mechanics) , *SYMMETRY , *QUANTUM theory , *CASCADES (Fluid dynamics) , *GLUONS - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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