Z+jet correlation with NLO-matched parton-shower and jet-medium interaction in high-energy nuclear collisions

Abstract

The impact of jet quenching on $Z^0$-tagged jets in relativistic heavy-ion collisions at the Large Hadron Collider (LHC) is investigated. We employ Sharpa Monte Carlo program that combines next-to-leading order matrix elements with matched resummation of parton shower to compute the initial $Z^0$+jet production. The Linear Boltzmann Transport (LBT) model is then used to simulate the propagation, energy attenuation of and medium response induced by jet partons in the quark-gluon plasma. With both higher-order corrections and matched soft/collinear radiation as well as a sophisticated treatment of parton energy loss and medium response in LBT, our numerical calculations can provide the best description so far of all available observables of $Z^0$+jet simultaneously in both p+p and Pb+Pb collisions, in particular, the shift of the distribution in transverse momentum asymmetry $x_{\mathrm{jZ}}=p_T^{\mathrm{jet}}/p_T^Z$, the modification of azimuthal angle correlation in $\Delta {\varphi }_{\mathrm{j}\mathrm{Z}}=|{\varphi }_{\mathrm{jet}}-{\varphi }_Z|$ and the overall suppression of average number of $Z^0$-tagged jets per boson $R_{\mathrm{jZ}}$ at $\sqrt{s}=5.02$ TeV as measured by the CMS experiment. We also show that higher-order corrections to $Z^0$+jet production play an indispensable role in understanding $Z^0$+jet azimuthal angle correlation at small and intermediate $\Delta {\varphi }_{\mathrm{jZ}}$, and momentum imbalance at small $x_{\mathrm{jZ}}$. Jet quenching of the sub-leading jets is shown to lead to suppression of $Z^0$+jet correlation at small azimuthal angle difference $\Delta {\varphi }_{\mathrm{jZ}}$ and at small $x_{\mathrm{jZ}}$.

5 pages, 5 figures. Final version accepted for publication in Rapid Communication of PRC

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