Effect of medium recoil and $p_T$ broadening on single inclusive jet suppression in high-energy heavy-ion collisions in the high-twist approach

Jet energy loss and single inclusive jet suppression in high-energy heavy-ion collisions are studied within a pQCD parton model that includes both elastic and radiative interactions between jet shower and medium partons as they propagate through the quark-gluon plasma. The collisional energy loss of jets with a given cone size is found to be relatively small comparing with the radiative energy loss. However, the effect of transverse momentum broadening due to elastic scattering is significant in the calculation of radiative energy loss within the high-twist formalism. The nuclear modification factors for single inclusive jets with different cone sizes are calculated and compared to experimental data as measured by ALICE and ATLAS experiments in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. Results on jet suppression in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV are also presented.

Figure 1

Collisional energy losses for a quark jet that is produced at $x=0, y=0, \varphi =0$ and propagates though the medium in the $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV Pb+Pb collisions in the $0–10\%$ centrality.

Figure 2

Radiative energy loss for a quark jet ($R=0.4$) with (solid) and without (dashed) $p_T$ broadening as a function of the initial jet energy as compared to the parton energy loss (dot-dashed). The initial jet is produced at $x=y=z=0$ and propagates along $\varphi =0$ in $0-10\%$ central Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV.

Figure 3

Radiative energy loss of a 200 GeV quark jet that is produced at the $x=0, y=0, \varphi =0$ and propagates through medium in $0–10\%$ central Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV as a function of the jet-cone size.

Figure 4

Cross section for single inclusive jet production in p+p collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV from NLO pQCD calculation as compared to the experimental data by ATLAS experiment [61].

Figure 5

Quark and gluon fractions in leading-order approximation in p+p collisions at $\sqrt{s}=2.76$ TeV.

Figure 6

Quark and gluon fractions with pythia in p+p collisions at $\sqrt{s}=2.76$ TeV.

Figure 7

Jet suppression factor in central Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV calculated with and without the recoil parton in the collisional energy loss, comparing with the ATLAS data [61].

Figure 8

Jet suppression factor in central Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV calculated with and without recoil parton in the collisional energy loss, comparing with the ALICE data [62].

Figure 9

Jet suppression in central Pb+Pb collisions at 5.02 TeV LHC for $R=0.4$ and $R=0.2$ in the rapidity region $\left|y\right|<2.1$.