Differential measurements of jet substructure and partonic energy loss in Au$+$Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV

Abstract

The STAR collaboration presents jet substructure measurements related to both the momentum fraction and the opening angle within jets in \pp and \AuAu collisions at \sqrtsn $=200$ GeV. The substructure observables include SoftDrop groomed momentum fraction (\zg), groomed jet radius (\rg), and subjet momentum fraction (\zsj) and opening angle (\tsj). The latter observable is introduced for the first time. Fully corrected subjet measurements are presented for \pp collisions and are compared to leading order Monte Carlo models. The subjet \tsj~distributions reflect the jets leading opening angle and are utilized as a proxy for the resolution scale of the medium in \AuAu collisions. We compare data from \AuAu collisions to those from \pp which are embedded in minimum-bias \AuAu events in order to include the effects of detector smearing and the heavy-ion collision underlying event. The subjet observables are shown to be more robust to the background than \zg~and \rg. We observe no significant modifications of the subjet observables within the two highest-energy, back-to-back jets, resulting in a distribution of opening angles and the splittings that are vacuum-like. We also report measurements of the differential di-jet momentum imbalance ($A_{\mathrm{J}}$) for jets of varying \tsj. We find no qualitative differences in energy loss signatures for varying angular scales in the range $0.1<$ \tsj $<0.3$, leading to the possible interpretation that energy loss in this population of high momentum di-jet pairs, is due to soft medium-induced gluon radiation from a single color-charge as it traverses the medium.

arXiv comment17 pages, 11 figures, 1 Appendix. Published version

References in corpus (90)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Herwig++ Physics and Manual
• Radiative energy loss and $p_{\perp }$-broadening of high energy partons in nuclei
• Herwig 7.0 / Herwig++ 3.0 Release Note
• 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
• 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
• Fully quantum treatment of the Landau--Pomeranchuk--Migdal effect in QED and QCD
• Multiple Collisions and Induced Gluon Bremsstrahlung in QCD
• Transverse momentum and collision energy dependence of high $p_T$ hadron suppression in Au+Au collisions at ultrarelativistic energies
• The STAR Time Projection Chamber: A Unique Tool for Studying High Multiplicity Events at RHIC
• Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV
• Disappearance of back-to-back high $p_T$ hadron correlations in central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Evidence from d+Au measurements for final-state suppression of high $p_T$ hadrons in Au+Au collisions at RHIC
• Towards an understanding of jet substructure
• Extracting jet transport coefficient from jet quenching at RHIC and LHC
• Towards Jetography
• Induced Gluon Radiation in a QCD Medium
• Jet quenching in high-energy heavy-ion collisions
• The LPM effect in QCD and Radiative energy loss in a quark-gluon plasma
• 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
• Measurements of the Nuclear Modification Factor for Jets in Pb+Pb Collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV with the ATLAS Detector
• Review of Jet Measurements in Heavy Ion Collisions
• 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
• Measurement of inclusive jet charged-particle fragmentation functions in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector
• Measurement of the nuclear modification factor for inclusive jets in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Jet Structure in Heavy Ion Collisions
• Jet quenching and medium response in high-energy heavy-ion collisions: a review
• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Measurement of charged jet suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Measurement of inclusive jet cross sections in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Jets in Hadron-Hadron Collisions
• Measurement of the splitting function in pp and PbPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 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
• Measurements of inclusive jet spectra in pp and central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Groomed jets in heavy-ion collisions: sensitivity to medium-induced bremsstrahlung
• Particle-level pileup subtraction for jets and jet shapes
• Exploration of jet substructure using iterative declustering in pp and Pb-Pb collisions at LHC energies
• First measurement of jet mass in Pb-Pb and p-Pb collisions at the LHC
• Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at sqrt(s(NN))= 2.76 TeV with the ATLAS detector
• Measurement of jet fragmentation in Pb+Pb and $pp$ collisions at $\sqrt{s_{NN}}=5.02$ TeV with the ATLAS detector
• New and Old Jet Clustering Algorithms for Electron-Positron Events
• Centrality-dependent modification of jet-production rates in deuteron-gold collisions at $\sqrt{s_{NN}}$=200 GeV
• 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
• Medium-induced gluon radiation with full resummation of multiple scatterings for realistic parton-medium interactions
• Jet (de)coherence in Pb-Pb collisions at the LHC
• Longitudinal double-spin asymmetry for inclusive jet and dijet production in $pp$ collisions at $\sqrt{s}=510$ GeV
• Measurement of the groomed jet mass in PbPb and pp collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 TeV
• Measurement of inclusive charged-particle jet production in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV
• Observation of medium induced modifications of jet fragmentation in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV using isolated-photon-tagged jets
• Jet shapes of isolated photon-tagged jets in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Decomposing transverse momentum balance contributions for quenched jets in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Cone size dependence of jet suppression in heavy-ion collisions
• A local Monte Carlo framework for coherent QCD parton energy loss
• Azimuthal anisotropy of charged jet production in $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV Pb-Pb collisions
• Improved opacity expansion for medium-induced parton splitting
• Di-Jet Imbalance Measurements at $\sqrt{s_{NN}}=200$ GeV at STAR
• Measurement of Groomed Jet Substructure Observables in \pp Collisions at $\sqrt{s}=200$ GeV with STAR
• Initial-state cold nuclear matter energy loss effects on inclusive jet production in p+A collisions at RHIC and LHC
• Jets and QCD: A Historical Review of the Discovery of the Quark and Gluon Jets and its Impact on QCD
• Time reclustering for jet quenching studies
• Medium-induced cascade in expanding media
• Identifying groomed jet splittings in heavy-ion collisions
• Dijet azimuthal correlations and conditional yields in $pp$ and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV with the ATLAS detector
• Measurement of jet fragmentation in 5.02 TeV proton-lead and proton-proton collisions with the ATLAS detector
• Novel subjet observables for jet quenching in heavy-ion collisions
• Jet Quenching from soft QCD Scattering in the Quark-Gluon Plasma
• A Theoretical Assessment of Jet-Hadron Correlations
• Dynamical grooming meets LHC data
• QGP and Modified Jet Fragmentation
• PHENIX results on jet modification with ${\pi }^0$- and photon-triggered two particle correlations in $p$$+$$p$, $p(d)$+Au, and Au+Au collisions

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