Di-Jet Imbalance Measurements at $\sqrt{s_{NN}}=200$ GeV at STAR

Abstract

We report the first di-jet transverse momentum asymmetry measurements from Au+Au and p+p collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments with transverse momenta above 2 GeV/c display a significantly stronger momentum imbalance in heavy-ion collisions than in the p+p reference. When re-examined with correlated soft particles included, we observe that these di-jets then exhibit a unique new feature -- momentum balance is restored to that observed in p+p for a jet resolution parameter of R=0.4, while re-balancing is not attained with a smaller value of R=0.2.

arXiv comment7 pages, 3 figures. To be submitted to PRL

References in corpus (28)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• 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
• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at $sqrt {s sub {sub {NN}}}_ = 130 GeV
• 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
• 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
• The Catchment Area of Jets
• Extracting jet transport coefficient from jet quenching at RHIC and LHC
• The theory and phenomenology of perturbative QCD based jet quenching
• Jet quenching in high-energy heavy-ion collisions
• 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
• Centrality dependence of charged hadron transverse momentum spectra in d+Au collisions at sqrt(s_NN) = 200 GeV
• Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at $\sqrt{s}=200$ GeV
• Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR
• On the sensitivity of the dijet asymmetry to the physics of jet quenching
• Medium modification of jet fragmentation in Au+Au collisions at sqrt(s_NN)=200 GeV measured in direct photon-hadron correlations
• A Theoretical Assessment of Jet-Hadron Correlations

Cited by in corpus (27)

• Review of Jet Measurements in Heavy Ion Collisions
• Measurement of the splitting function in pp and PbPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 TeV
• Constraints on jet quenching in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathbf{NN}}}$ = 5.02 TeV measured by the event-activity dependence of semi-inclusive hadron-jet distributions
• First measurement of large area jet transverse momentum spectra in heavy-ion collisions
• Study of jet quenching with isolated-photon+jet correlations 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
• Evolution of the Mean Jet Shape and Dijet Asymmetry Distribution of an Ensemble of Holographic Jets in Strongly Coupled Plasma
• Using Z boson events to study parton-medium interactions in PbPb collisions
• Light and heavy flavor dijet production and dijet mass modification in heavy ion collisions
• Differential measurements of jet substructure and partonic energy loss in Au$+$Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV
• Hard jet substructure in a multistage approach
• Transverse momentum balance of dijets in Xe+Xe collisions at the LHC
• Highlights from STAR heavy ion program
• Correlations of event activity with hard and soft processes in $p$ + Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV at STAR
• Jet evolution in a dense QCD medium
• Study of a background reconstruction method for the measurement of D-meson azimuthal angular correlations
• Constraining parton energy loss via angular and momentum based differential jet measurements at STAR
• Evidence of medium response to hard probes using correlations of Z bosons with hadrons in heavy ion collisions
• Jet shapes and fragmentation functions in Au+Au collisions at sqrt(sNN) = 200 GeV in STAR
• Hadron productions and jet substructures associated with $Z^0/\gamma$ in Pb+Pb collisions at the LHC
• Measurements of jets in heavy ion collisions
• Effect of $\alpha$-clusters on particle production in O$-$O and p$-$O collisions at LHC energies
• Measurement of semi-inclusive jet fragmentation functions in Au+Au collisions at sqrt(s_NN) = 200 GeV in STAR
• Quantifying the Jet Energy Loss in Pb+Pb collisions at LHC
• Quenching of heavy and light flavour jets: experimental overview
• The dijet mass distribution in heavy ion collisions
• The effect of recoils on soft-drop-groomed observables in $\gamma$-tagged jets in a multistage approach