Jet nuclear modification factor R_AA increases with cone radius R as in-cone energy loss from elastic recoils and radiated gluons decreases at larger radii.
Tomography of high-energy nuclear collisions with photon-hadron correlations
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abstract
Within the next-to-leading order (NLO) perturbative QCD (pQCD) parton model, suppression of away-side hadron spectra associated with a high $p_{T}$ photon due to parton energy loss is studied in high-energy heavy-ion collisions. Dictated by the shape of the $\gamma$-associated jet spectrum in NLO pQCD, hadron spectra at large $z_T=p_T^{h}/p_T^{\gamma} \stackrel{>}{\sim} 1$ are more sensitive to parton energy loss and therefore are dominated by surface emission of $\gamma$-associated jets, whereas small $z_{T}$ hadrons mainly come from fragmentation of jets with reduced energy which is controlled by the volume emission. These lead to different centrality dependence of the $\gamma$-hadron suppression for different values of $z_{T}$. Therefore, a complete measurement of the suppression of $\gamma$-triggered hadron spectra, including its dependence on the orientation of the $\gamma$-hadron pair with respect to the reaction plane, allows the extraction of the spatial distribution of jet quenching parameters, achieving a true tomographic study of the quark-gluon plasma in high-energy heavy-ion collisions.
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ALICE observes strong suppression of associated hadron yields per trigger photon in central Pb-Pb collisions at 5.02 TeV, extending the kinematic reach of photon-hadron correlation measurements.
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Jet cone size dependence of single inclusive jet suppression due to jet quenching in Pb+Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
Jet nuclear modification factor R_AA increases with cone radius R as in-cone energy loss from elastic recoils and radiated gluons decreases at larger radii.
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Measurement of isolated-prompt photon$-$hadron correlations in Pb$-$Pb collisions at $\mathbf{\sqrt{\textit{s}_{\rm NN}} = 5.02}$ TeV
ALICE observes strong suppression of associated hadron yields per trigger photon in central Pb-Pb collisions at 5.02 TeV, extending the kinematic reach of photon-hadron correlation measurements.