期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.222002
关键词
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资金
- European Research Council under the Advanced Investigator Grant [ERC-AD-267258]
- Brazilian research agency CAPES
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.
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