Angular Structure of the In-Medium QCD Cascade

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 data on dijet asymmetry.
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https://hal-cea.archives-ouvertes.fr/cea-01197331
Contributor : Emmanuelle de Laborderie <>
Submitted on : Friday, September 11, 2015 - 2:57:48 PM
Last modification on : Thursday, February 7, 2019 - 3:22:25 PM

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

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