Phenomenological study of the angle between jet axes in heavy-ion collisions
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866916896878624768 |
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| author | Kang, Jin-Wen Wang, Sa Wang, Lei Zhang, Ben-Wei |
| author_facet | Kang, Jin-Wen Wang, Sa Wang, Lei Zhang, Ben-Wei |
| contents | This paper presents a phenomenological study on the angle between the Standard and the Winner-Take-All (WTA) jet axes ($ΔR_{\rm axis}^{\rm WTA-Std}$) in high-energy nuclear collisions. The $p$+$p$ baseline is provided by the Pythia8 event generator. The in-medium jet propagation is simulated by the linear Boltzmann transport (LBT) model, which considers both the elastic and inelastic jet-medium interactions. Our theoretical results calculated by the LBT model show that the $ΔR_{\rm axis}^{\rm WTA-Std}$ distribution in Pb+Pb at $\sqrt{s}=5.02$ TeV is narrower than that in $p$+$p$, which agrees well with the recent ALICE measurements. The narrowing of $ΔR_{\rm axis}^{\rm WTA-Std}$ seems to violate the $p_T$-broadening nature of the jet quenching effect, usually explained by the influence of "selection bias". However, the physical details still need to be fully understood. Utilizing a matching-jet method to track the jet evolution in the QGP to remove the selection bias in the Monte Carlo simulations, we observe that the $ΔR_{\rm axis}^{\rm WTA-Std}$ distribution becomes broader due to the jet-medium interactions. At the same time, by rescaling the quark/gluon-jet fractions in Pb+Pb collisions to be the same as that in $p$+$p$, we find that the fraction change may not significantly influence the modification pattern of jet $ΔR_{\rm axis}^{\rm WTA-Std}$. On the other hand, the selected jet sample in A+A collisions has a significantly narrower initial $ΔR_{\rm axis}^{\rm WTA-Std}$ distribution than the $p$+$p$ baseline, and such a biased comparison between $p$+$p$ and A+A conceals the actual jet-broadening effect in the experimental measurements. The investigations presented in this paper will deepen our understanding of the relationship between the actual intra-jet modifications in the QGP and the experimental observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_15518 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Phenomenological study of the angle between jet axes in heavy-ion collisions Kang, Jin-Wen Wang, Sa Wang, Lei Zhang, Ben-Wei High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory This paper presents a phenomenological study on the angle between the Standard and the Winner-Take-All (WTA) jet axes ($ΔR_{\rm axis}^{\rm WTA-Std}$) in high-energy nuclear collisions. The $p$+$p$ baseline is provided by the Pythia8 event generator. The in-medium jet propagation is simulated by the linear Boltzmann transport (LBT) model, which considers both the elastic and inelastic jet-medium interactions. Our theoretical results calculated by the LBT model show that the $ΔR_{\rm axis}^{\rm WTA-Std}$ distribution in Pb+Pb at $\sqrt{s}=5.02$ TeV is narrower than that in $p$+$p$, which agrees well with the recent ALICE measurements. The narrowing of $ΔR_{\rm axis}^{\rm WTA-Std}$ seems to violate the $p_T$-broadening nature of the jet quenching effect, usually explained by the influence of "selection bias". However, the physical details still need to be fully understood. Utilizing a matching-jet method to track the jet evolution in the QGP to remove the selection bias in the Monte Carlo simulations, we observe that the $ΔR_{\rm axis}^{\rm WTA-Std}$ distribution becomes broader due to the jet-medium interactions. At the same time, by rescaling the quark/gluon-jet fractions in Pb+Pb collisions to be the same as that in $p$+$p$, we find that the fraction change may not significantly influence the modification pattern of jet $ΔR_{\rm axis}^{\rm WTA-Std}$. On the other hand, the selected jet sample in A+A collisions has a significantly narrower initial $ΔR_{\rm axis}^{\rm WTA-Std}$ distribution than the $p$+$p$ baseline, and such a biased comparison between $p$+$p$ and A+A conceals the actual jet-broadening effect in the experimental measurements. The investigations presented in this paper will deepen our understanding of the relationship between the actual intra-jet modifications in the QGP and the experimental observations. |
| title | Phenomenological study of the angle between jet axes in heavy-ion collisions |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2312.15518 |