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.

4 pages, 2 figures

References in corpus (22)

• Radiative energy loss and $p_{\perp }$-broadening of high energy partons in nuclei
• Radiative energy loss of high energy quarks and gluons in a finite volume quark-gluon plasma
• Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at sqrt(S(NN))= 2.76 TeV with the ATLAS Detector at the LHC
• Fully quantum treatment of the Landau--Pomeranchuk--Migdal effect in QED and QCD
• Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Bottom-up thermalization in heavy ion collisions
• Quenching of hadron spectra in media
• Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV
• MARTINI: An event generator for relativistic heavy-ion collisions
• Energy Loss of Leading Partons in a Thermal QCD Medium
• Medium-Induced QCD Cascade: Democratic Branching and Wave Turbulence
• Q-PYTHIA: a medium-modified implementation of final state radiation
• Medium-induced gluon branching
• Medium Modification of Jet Shapes and Jet Multiplicities
• Renormalization of the jet-quenching parameter
• Probabilistic picture for medium-induced jet evolution
• Picturing perturbative parton cascades in QCD matter
• Bjorken Flow, Plasma Instabilities, and Thermalization
• Jet (de)coherence in Pb-Pb collisions at the LHC
• Angular distribution of medium-induced QCD cascades
• A local Monte Carlo framework for coherent QCD parton energy loss
• An analysis of the influence of background subtraction and quenching on jet observables in heavy-ion collisions

Cited by in corpus (37)

• Heavy Ion Collisions: Achievements and Challenges
• Angular Structure of Jet Quenching Within a Hybrid Strong/Weak Coupling Model
• Full jet in quark-gluon plasma with hydrodynamic medium response
• Vacuum-like jet fragmentation in a dense QCD medium
• Groomed jets in heavy-ion collisions: sensitivity to medium-induced bremsstrahlung
• Predictions for Boson-Jet Observables and Fragmentation Function Ratios from a Hybrid Strong/Weak Coupling Model for Jet Quenching
• Measurement of jet fragmentation in Pb+Pb and $pp$ collisions at $\sqrt{s_{NN}}=5.02$ TeV with the ATLAS detector
• Deciphering the $z_g$ distribution in ultrarelativistic heavy ion collisions
• Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• QGP modification to single inclusive jets in a calibrated transport model
• Angular distribution of medium-induced QCD cascades
• Cone size dependence of jet suppression in heavy-ion collisions
• Dynamically groomed jet radius in heavy-ion collisions
• Universal quark to gluon ratio in medium-induced parton cascade
• Radiative energy loss of neighboring subjets
• Interplay between Mach cone and radial expansion and its signal in $\gamma$-jet events
• Measurement of angular and momentum distributions of charged particles within and around jets in Pb+Pb and $pp$ collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Jet radiation in a longitudinally expanding medium
• Jet thermalization in QCD kinetic theory
• In-medium modification of dijets in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Hard jet substructure in a multistage approach
• Solutions of evolution equations for medium-induced QCD cascades
• Jet properties in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Jet asymmetry and momentum imbalance from $2\to 2$ and $2\to 3$ partonic processes in relativistic heavy-ion collisions
• Medium induced QCD cascades: broadening and rescattering during branching
• Event-by-event fluctuations in the medium-induced jet evolution
• Thermalization of mini-jets in a quark-gluon plasma
• Transverse momentum broadening of medium-induced cascades in expanding media
• Multi-particle correlations and KNO scaling in the medium-induced jet evolution
• The role of initial state radiation in quenched jets
• Theoretical Developments in QCD Jet Energy Loss
• Hard Probes: After the dust has settled!
• Adding vacuum branching to jet evolution in a dense medium
• In-medium parton branching beyond eikonal approximation
• A new pQCD based Monte Carlo event generator for jets in the quark-gluon plasma
• Recent progress on the understanding of the medium-induced jet evolution and energy loss in pQCD
• Theory overview of Heavy Ion collisions