Measurement of the splitting function in pp and PbPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 TeV

Abstract

Data from heavy ion collisions suggest that the evolution of a parton shower is modified by interactions with the color charges in the dense partonic medium created in these collisions, but it is not known where in the shower evolution the modifications occur. The momentum ratio of the two leading partons, resolved as subjets, provides information about the parton shower evolution. This substructure observable, known as the splitting function, reflects the process of a parton splitting into two other partons and has been measured for jets with transverse momentum between 140 and 500 GeV, in pp and PbPb collisions at a center-of-mass energy of 5.02 GeV per nucleon pair. In central PbPb collisions, the splitting function indicates a more unbalanced momentum ratio, compared to peripheral PbPb and pp collisions. The measurements are compared to various predictions from event generators and analytical calculations.

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References in corpus (60)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Herwig++ Physics and Manual
• Dispelling the N^3 myth for the Kt jet-finder
• Radiative energy loss and $p_{\perp }$-broadening of high energy partons in nuclei
• Better Jet Clustering Algorithms
• Radiative energy loss of high energy quarks and gluons in a finite volume quark-gluon plasma
• Jet substructure as a new Higgs search channel at the LHC
• Particle-flow reconstruction and global event description with the CMS detector
• Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at $sqrt {s sub {sub {NN}}}_ = 130 GeV
• Soft Drop
• 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
• Transverse momentum and collision energy dependence of high $p_T$ hadron suppression in Au+Au collisions at ultrarelativistic energies
• Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS
• Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Event generator tunes obtained from underlying event and multiparton scattering measurements
• Jet Trimming
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• 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
• Suppressed pi^0 Production at Large Transverse Momentum in Central Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Towards an understanding of jet substructure
• Induced Gluon Radiation in a QCD Medium
• A model of jet quenching in ultrarelativistic heavy ion collisions and high-pt hadron spectra at RHIC
• Recombination Algorithms and Jet Substructure: Pruning as a Tool for Heavy Particle Searches
• Transverse Momentum Spectra in Au+Au and d+Au Collisions at $\sqrt{s_{NN}}$=200 GeV and the Pseudorapidity Dependence of High p${}_T$ Suppression
• Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV
• Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC
• Charged-particle nuclear modification factors in PbPb and pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Modification of jet shapes in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• New picture of jet quenching dictated by color coherence
• Measurement of jet fragmentation in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• A perturbative framework for jet quenching
• Sudakov Safety in Perturbative QCD
• Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Pileup subtraction for jet shapes
• Charged hadron transverse momentum distributions in Au+Au collisions at sqrt(s_NN) = 200 GeV
• 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
• Measurement of charged jet suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Particle-yield modification in jet-like azimuthal di-hadron correlations in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Constraining MPI models using sigma_effective and recent Tevatron and LHC Underlying Event data
• Study of the underlying event at forward rapidity in pp collisions at sqrt(s) = 0.9, 2.76, and 7 TeV
• Probing the hardest branching of jets in heavy ion collisions
• Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Measurements of jet quenching with semi-inclusive hadron+jet distributions in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Sensitivity of jet substructure to jet-induced medium response
• Groomed jets in heavy-ion collisions: sensitivity to medium-induced bremsstrahlung
• Particle-level pileup subtraction for jets and jet shapes
• Exposing the QCD Splitting Function with CMS Open Data
• First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC
• Measurement of jet fragmentation in Pb+Pb and $pp$ collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with the ATLAS detector
• Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Probing medium-induced jet splitting and energy loss in heavy-ion collisions
• Jet (de)coherence in Pb-Pb collisions at the LHC
• Jet Substructure Studies with CMS Open Data
• Di-Jet Imbalance Measurements at $\sqrt{s_{NN}}=200$ GeV at STAR

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• Heavy Ion Collisions: The Big Picture, and the Big Questions
• Jet Substructure at the Large Hadron Collider: A Review of Recent Advances in Theory and Machine Learning
• The ALICE experiment: a journey through QCD
• Jet quenching and medium response in high-energy heavy-ion collisions: a review
• Exploration of jet substructure using iterative declustering in pp and Pb-Pb collisions at LHC energies
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• The Present and Future of QCD
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• Measurement of jet substructure observables in $\mathrm{t}\overline{\mathrm{t}}$ events from proton-proton collisions at $\sqrt{s}=$ 13TeV
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• Dynamical grooming of QCD jets
• Measurement of inclusive charged-particle jet production in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV
• The groomed and ungroomed jet mass distribution for inclusive jet production at the LHC
• Jets as precision probes in electron-nucleus collisions at the Electron-Ion Collider
• Jet shapes of isolated photon-tagged jets in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Medium modification of the shape of small-radius jets in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76\mathrm{TeV}$
• Can We Observe Jet $P_T$-broadening in Heavy-Ion Collisions at the LHC?
• Dynamically groomed jet radius in heavy-ion collisions
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• Measurement of energy correlators inside jets and determination of the strong coupling ${\alpha }_{\mathrm{S}}(m_{\mathrm{Z}})$
• Measurement of the radius dependence of charged-particle jet suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Pileup and Underlying Event Mitigation with Iterative Constituent Subtraction
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• Deep learning jet modifications in heavy-ion collisions
• Disentangling Jet Modification in Jet Simulations and in Z+Jet Data
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• Measurement of substructure-dependent jet suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• Computing $N$-subjettiness for boosted jets
• Identifying groomed jet splittings in heavy-ion collisions
• Jet radiation in a longitudinally expanding medium
• Novel subjet observables for jet quenching in heavy-ion collisions
• Evidence for top quark production in nucleus-nucleus collisions
• Measurement of the production of charm jets tagged with D${}^0$ mesons in pp collisions at $\sqrt{s}$= 7 TeV
• Measurement of suppression of large-radius jets and its dependence on substructure in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Medium Response and Jet-Hadron Correlations in Relativistic Heavy-Ion Collisions
• QCD Challenges from pp to A-A Collisions
• Differential measurements of jet substructure and partonic energy loss in Au$+$Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV
• Pushing forward jet substructure measurements in heavy-ion collisions
• Dynamical grooming meets LHC data
• Hard jet substructure in a multistage approach
• Performance of the ALICE Electromagnetic Calorimeter
• Heavy-Flavour Jets in High-Energy Nuclear Collisions
• Isolating perturbative QCD splittings in heavy-ion collisions
• Measurement of inclusive charged-particle b-jet production in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• The soft drop momentum sharing fraction $z_g$ beyond leading-logarithmic accuracy
• Revisiting the role of grooming in DIS
• First measurements of $N$-subjettiness in central Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Probing heavy ion collisions using quark and gluon jet substructure with machine learning
• Measurements of groomed-jet substructure of charm jets tagged by ${\mathrm{D}}^0$ mesons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Jet evolution in a dense QCD medium
• Measurement of groomed event shape observables in deep-inelastic electron-proton scattering at HERA
• Classification of quark and gluon jets in hot QCD medium with deep learning
• Measurement of jet substructure in boosted $t\bar{t}$ events with the ATLAS detector using 140 fb${}^{-1}$ of 13 TeV $pp$ collisions
• Measurement of the groomed jet radius and momentum splitting fraction in pp and Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• A background estimator for jet studies in p+p and A+A collisions
• Analysis note: jet reconstruction, energy spectra, and substructure analyses with archived ALEPH data
• Nuclear effects on jet substructure observables at the LHC
• Measurement of inclusive jet cross section and substructure in $p$$+$$p$ collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Measurements of jets in heavy ion collisions
• Exploiting $\nu$-dependence of projected energy correlators in HICs
• Deep Image Reconstruction for Background Subtraction in Heavy-Ion Collisions
• Improving sensitivity of vectorlike top partner searches with jet substructure
• Studying the QGP with Jets at the LHC and RHIC