Quantifying jet transport properties via large $p_T$ hadron production

Abstract

Nuclear modification factor $R_{AA}$ for large $p_T$ single hadron is studied in a next-to-leading order (NLO) perturbative QCD (pQCD) parton model with medium-modified fragmentation functions (mFFs) due to jet quenching in high-energy heavy-ion collisions. The energy loss of the hard partons in the QGP is incorporated in the mFFs which utilize two most important parameters to characterize the transport properties of the hard parton jets: the jet transport parameter ${\hat{q}}_0$ and the mean free path ${\lambda }_0$, both at the initial time ${\tau }_0$. A phenomenological study of the experimental data for $R_{AA}(p_T)$ is performed to constrain the two parameters with simultaneous ${\chi }^2/d.o.f$ fits to RHIC as well as LHC data. We obtain for energetic quarks ${\hat{q}}_0\approx 1.1\pm 0.2$ GeV${}^2$/fm and ${\lambda }_0\approx 0.4\pm 0.03$ fm in central $Au+Au$ collisions at $\sqrt{s_{NN}}=200$ GeV, while ${\hat{q}}_0\approx 1.7\pm 0.3$ GeV${}^2$/fm, and ${\lambda }_0\approx 0.5\pm 0.05$ fm in central $Pb+Pb$ collisions at $\sqrt{s_{NN}}=2.76$ TeV. Numerical analysis shows that the best fit favors a multiple scattering picture for the energetic jets propagating through the bulk medium, with a moderate averaged number of gluon emissions. Based on the best constraints for ${\lambda }_0$ and ${\tau }_0$, the estimated value for the mean-squared transverse momentum broadening is moderate which implies that the hard jets go through the medium with small reflection.

8 pages, 6 figures, revised version

References in corpus (20)

• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Calculating the Jet Quenching Parameter from AdS/CFT
• Extracting jet transport coefficient from jet quenching at RHIC and LHC
• Radiative and Collisional Jet Energy Loss in the Quark-Gluon Plasma at RHIC
• Inclusive cross section and double helicity asymmetry for π^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton
• Antiangular Ordering of Gluon Radiation in QCD Media
• Dihadron Tomography of High-Energy Nuclear Collisions in NLO pQCD
• Renormalization of the jet-quenching parameter
• Tomography of high-energy nuclear collisions with photon-hadron correlations
• Prospects of medium tomography using back-to-back hadron correlations
• Jet quenching phenomenology from soft-collinear effective theory with Glauber gluons
• Azimuthal jet flavor tomography with CUJET2.0 of nuclear collisions at RHIC and LHC
• Confronting current NLO parton fragmentation functions with inclusive charged-particle spectra at hadron colliders
• Higher twist jet broadening and classical propagation
• Jet (de)coherence in Pb-Pb collisions at the LHC
• Calculating the Jet Quenching Parameter $\hat{q}$ in Lattice Gauge Theory
• The non-linear evolution of jet quenching
• Initial Conditions for Modified DGLAP Evolution of the Modified Fragmentation Functions in Nuclear Medium
• Radiative energy loss and radiative p_T-broadening of high-energy partons in QCD matter
• Punch-through jets in $A+A$ collisions at RHIC/LHC

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• Jet-like correlations with neutral pion triggers in pp and central Pb-Pb collisions at 2.76 TeV
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: hard probes
• NLO Productions of $\omega$ and $K_{\mathrm{S}}^0$ with a Global Extraction of the Jet Transport Parameter in Heavy Ion collisions
• Jet charge in high energy nuclear collisions
• Medium modifications of girth distributions for inclusive jets and $Z^0+\mathrm{jet}$ in relativistic heavy-ion collisions at the LHC
• Nuclear suppression of $\varphi$ meson yields with large $p_T$ at the RHIC and the LHC
• Relating $\hat{q}$, $\eta /s$ and $\Delta E$ in an expanding Quark-Gluon Plasma
• Probing the in-medium $P_T$-broadening by $\gamma$+HF angular de-correlations
• Production of ${\rho }^0$ meson with large $p_T$ at NLO in heavy-ion collisions
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• Particle production at large $p_T$ in Xe+Xe collisions with jet quenching using the higher twist approach
• Jet cone size dependence of single inclusive jet suppression due to jet quenching in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV