Jet-like Correlations with Direct-Photon and Neutral-Pion Triggers at $\sqrt{s_{{}_{NN}}}=200$ GeV

Abstract

Azimuthal correlations of charged hadrons with direct-photon (${\gamma }_{dir}$) and neutral-pion (${\pi }^0$) trigger particles are analyzed in central Au+Au and minimum-bias $p+p$ collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV in the STAR experiment. The charged-hadron per-trigger yields at mid-rapidity from central Au+Au collisions are compared with $p+p$ collisions to quantify the suppression in Au+Au collisions. The suppression of the away-side associated-particle yields per ${\gamma }_{dir}$ trigger is independent of the transverse momentum of the trigger particle ($p_T^{\mathrm{trig}}$), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons ($p_T^{\mathrm{assoc}}$). Within uncertainty, similar levels of suppression are observed for ${\gamma }_{dir}$ and ${\pi }^0$ triggers as a function of $z_T$ ($\equiv p_T^{\mathrm{assoc}}/p_T^{\mathrm{trig}}$). The results are compared with energy-loss-inspired theoretical model predictions. Our studies support previous conclusions that the lost energy reappears predominantly at low transverse momentum, regardless of the trigger energy.

arXiv comment9 pages, 7 figures, minor modification, accepted version for publication in Physics Letters B

References in corpus (26)

• A Brief Introduction to PYTHIA 8.1
• 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
• Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at $sqrt {s sub {sub {NN}}}_ = 130 GeV
• The STAR Time Projection Chamber: A Unique Tool for Studying High Multiplicity Events at RHIC
• Disappearance of back-to-back high $p_T$ hadron correlations in central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Azimuthal anisotropy in Au+Au collisions at sqrtsNN = 200 GeV
• Centrality dependence of high pT hadron suppression in Au+Au collisions at sqrt(sNN)=130 GeV
• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Non-Abelian Energy Loss at Finite Opacity
• Jet Quenching in the Opposite Direction of a Tagged Photon in High-Energy Heavy-Ion Collisions
• Parton-to-Pion Fragmentation Reloaded
• Jet Tomography of Au+Au Reactions Including Multi-gluon Fluctuations
• Decomposition of Harmonic and Jet Contributions to Particle-pair Correlations at Ultra-relativistic Energies
• Jet energy loss, photon production, and photon-hadron correlations at RHIC
• Tomography of high-energy nuclear collisions with photon-hadron correlations
• Bulk matter evolution and extraction of jet transport parameter in heavy-ion collisions at RHIC
• Hadron Fragmentation Inside Jets in Hadronic Collisions
• Towards jet tomography: gamma-hadron correlations
• Studying Parton Energy Loss in Heavy-Ion Collisions via Direct-Photon and Charged-Particle Azimuthal Correlations
• Medium modification of jet fragmentation in Au+Au collisions at sqrt(s_NN)=200 GeV measured in direct photon-hadron correlations
• gamma-hadron correlations as a tool to trace the flow of energy lost from hard partons in heavy-ion collisions
• Photon Emission from a Medium-Modified Shower Evolution
• Jet-Triggered Photons from Back-Scattering Kinematics for Quark Gluon Plasma Tomography

Cited by in corpus (31)

• Review of Jet Measurements in Heavy Ion Collisions
• Effects of jet-induced medium excitation in $\gamma$-hadron correlation in A+A collisions
• Direct real photons in relativistic heavy ion collisions
• Measurement of photon-jet transverse momentum correlations in 5.02 TeV Pb+Pb and $pp$ collisions with ATLAS
• Inclusive jet and hadron suppression in a multistage approach
• Observation of medium induced modifications of jet fragmentation in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV using isolated-photon-tagged jets
• Information field based global Bayesian inference of the jet transport coefficient
• Extracting jet transport coefficient via single hadron and dihadron productions in high-energy heavy-ion collisions
• Jet-like correlations with neutral pion triggers in pp and central Pb-Pb collisions at 2.76 TeV
• Medium Response and Jet-Hadron Correlations in Relativistic Heavy-Ion Collisions
• Medium-induced modification of $Z$-tagged charged particle yields in Pb+Pb collisions at 5.02 TeV with the ATLAS detector
• Measurement of two-particle correlations with respect to second- and third-order event planes in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• $\gamma$-hadron spectra in p + Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Highlights from STAR heavy ion program
• Measurement of $\hat{q}$ in Relativistic Heavy Ion Collisions using di-hadron correlations
• Measurement of jet-medium interactions via direct photon-hadron correlations in Au$+$Au and $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Precision Dijet Acoplanarity Tomography of the Chromo Structure of Perfect QCD Fluids
• Search for the jet-induced diffusion wake in the quark-gluon plasma via measurements of jet-track correlations in photon-jet events in Pb+Pb collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 5.02 TeV with the ATLAS detector
• Comparison of fragmentation functions for light-quark- and gluon-dominated jets from $pp$ and Pb+Pb collisions in ATLAS
• E-by-e jet suppression, anisotropy, medium response and hard-soft tomography
• Jet modification via ${\pi }^0$-hadron correlations in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Measurement of medium-induced acoplanarity in central Au-Au and pp collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV using direct-photon+jet and ${\pi }^0$+jet correlations
• Medium-modification of photon-tagged jets in $AA$ collisions
• Quark Gluon Plasma Formation in Proton-Proton Collisions Using PYTHIA
• Dijet Acoplanarity in CUJET3 as a Probe of the Nonperturbative Color Structure of QCD Perfect Fluids
• Measurement of away-side broadening with self-subtraction of flow in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=200$ GeV
• Jet quenching in mini-quark-gluon plasma: Medium modification factor $I_{pA}$ for photon-tagged jets
• Neutral meson production and correlation with charged hadrons in pp and Pb-Pb collisions with the ALICE experiment at the LHC
• Measurement of $\hat{q}$ in RHI collisions using di-hadron correlations
• Latest results from RHIC + Progress on determining $\hat{q}L$ in RHI collisions using di-hadron correlations
• Direct photon-hadron correlation measurement and a way towards photon-triggered jets at RHIC