$Z^0$ boson associated b-jet production in high-energy nuclear collisions

Abstract

The production of vector boson tagged heavy quark jets potentially provides new tools to probe the jet quenching effect. In this paper, we present the first theoretical study on the angular correlations ($\Delta {\varphi }_{bZ}$), transverse momentum imbalance ($x_{bZ}$), and nuclear modification factor ($I_{AA}$) of $Z^0$ boson tagged b-jets in heavy-ion collisions, which was performed using a Monte Carlo transport model. We find that the medium modification of the $\Delta {\varphi }_{bZ}$ for $Z^0+$b-jet has a weaker dependence on $\Delta {\varphi }_{bZ}$ than that for $Z^0+$jet, and the modification patterns are sensitive to the initial jet $p_T$ distribution. Additionally, with the high purity of the quark jet in $Z^0+$(b-)jet production, we calculate the momentum imbalance $x_{bZ}$ and the nuclear modification factor $I_{AA}$ of $Z^0+$b-jet in Pb+Pb collisions. We observe a smaller $\Delta ⟨x_{jZ}⟩$ and larger $I_{AA}$ of $Z^0+$b-jet in Pb+Pb collisions relative to those of $Z^0+$jet, which may be an indication of the mass effect of jet quenching and can be tested in future measurements.

arXiv comment13 pages, 12 figures, 1 table. The version to appear in CPC

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