arXiv 2005.070182020-05hep-phnucl-exnucl-th

高能核碰撞中与$Z^0$玻色子伴随产生的b-jet

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

Sa Wang, Wei Dai, Ben-Wei Zhang, Enke Wang

备注：: 13 pages, 12 figures, 1 table. The version to appear in CPC
发表信息：: Chin.Phys.C 47 (2023) 5, 054102
DOI：: 10.1088/1674-1137/acc1ca

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AI总结：

本文首次用蒙特卡洛输运模型研究重离子碰撞中$Z^0$标记b-jet的角关联、动量不平衡和核修正因子，发现其介质修饰对喷注淬火的质量效应敏感。

摘要：

矢量玻色子标记的夸克喷注产生为探测喷注淬火效应提供了新工具。本文使用蒙特卡洛输运模型，首次对重离子碰撞中$Z^0$玻色子标记b-jet的角关联（$Δϕ_{bZ}$）、动量不平衡（$x_{bZ}$）和核修正因子（$I_{AA}$）进行了理论研究。我们发现，$Z^0\,+\,$b-jet的$Δϕ_{bZ}$介质修饰对$Δϕ_{bZ}$的依赖性弱于$Z^0\,+\,$jet，且修饰模式对初始jet $p_T$分布敏感。此外，利用$Z^0\,+\,$(b-)jet产生中夸克喷注的高纯度，我们计算了Pb+Pb碰撞中$Z^0\,+\,$b-jet的动量不平衡$x_{bZ}$和核修正因子$I_{AA}$。观察到Pb+Pb碰撞中$Z^0\,+\,$b-jet的$Δ\left\langle x_{jZ} \right\rangle$较小且$I_{AA}$较大，这可能是喷注淬火质量效应的指示，可在未来实验中检验。

英文摘要：

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 ($Δϕ_{bZ}$), 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 $Δϕ_{bZ}$ for $Z^0\,+\,$b-jet has a weaker dependence on $Δϕ_{bZ}$ 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 $Δ\left\langle x_{jZ} \right\rangle$ 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.

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