On the breaking of Casimir scaling in jet quenching

Abstract

We study the breaking of Casimir scaling, $C_F/C_A$, due to the evolution of jets in a hot and extended medium. By using JEWEL, a medium modified Monte Carlo event generator validated for a wide set of observables, we are able to study separately the development of quark and gluon-initiated jets produced back-to-back with a $Z-$boson. Focusing on the $p_T$ distribution, we conclude first that the colour charge ratio is constant but larger than Casimir scaling for high $p_T$ jets. In addition, our results seem to indicate that the medium induced cascade is more similar between quarks and gluons, thus driving the overall medium shower scaling away from the vacuum expectation. Finally, we compare our results to another Monte Carlo generator and observe the same scaling violation.

arXiv commentUpdated figures and text, minor changes no modification of the results, published version

References in corpus (30)

• The anti-k_t jet clustering algorithm
• FastJet user manual
• 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
• Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at $sqrt {s sub {sub {NN}}}_ = 130 GeV
• Fully quantum treatment of the Landau--Pomeranchuk--Migdal effect in QED and QCD
• Radiative energy loss of high energy quarks in finite-size nuclear matter and quark-gluon plasma
• Centrality dependence of high pT hadron suppression in Au+Au collisions at sqrt(sNN)=130 GeV
• Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Study of high-pT charged particle suppression in PbPb compared to pp collisions at sqrt(sNN)=2.76 TeV
• Medium-induced radiative energy loss; equivalence between the BDMPS and Zakharov formalisms
• New picture of jet quenching dictated by color coherence
• A perturbative framework for jet quenching
• Non-perturbative QCD effects in jets at hadron colliders
• Small-radius jets to all orders in QCD
• Medium-induced gluon branching
• Measurement of charged-particle spectra in Pb+Pb collisions at $\sqrt{s_{\mathsf{NN}}}=2.76$ TeV with the ATLAS detector at the LHC
• Medium response in JEWEL and its impact on jet shape observables in heavy ion collisions
• Bounding wide composite vector resonances at the LHC
• Picturing perturbative parton cascades in QCD matter
• Interpreting Single Jet Measurements in Pb+Pb Collisions at the LHC
• Study of jet quenching with Z+jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 5.02 TeV
• Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Jet quenching in strongly coupled plasma
• 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
• Universal quark to gluon ratio in medium-induced parton cascade
• Simulating V+jet processes in heavy ion collisions with JEWEL
• On similarity of jet quenching and charmonia suppression

Cited by in corpus (6)

• Overview of high-density QCD studies with the CMS experiment at the LHC
• Data-driven quark and gluon jet modification in heavy-ion collisions
• Pushing forward jet substructure measurements in heavy-ion collisions
• The impact of glasma on heavy flavor azimuthal correlations and spectra
• Unraveling Gluon Jet Quenching through $J/\psi$ Production in Heavy-Ion Collisions
• Flavor and path-length dependence of jet quenching from inclusive jet and γ-jet suppression