Parton splitting scales of reclustered large-radius jets in high-energy nuclear collisions

Shan-Liang Zhang; Meng-Quan Yang; Ben-Wei Zhang

doi:10.1140/epjc/s10052-022-10340-x

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2022) 82: 414
https://doi.org/10.1140/epjc/s10052-022-10340-x

Regular Article - Theoretical Physics

Parton splitting scales of reclustered large-radius jets in high-energy nuclear collisions

Shan-Liang Zhang¹^,2^,3, Meng-Quan Yang¹ and Ben-Wei Zhang¹^,2^c

¹ Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, 430079, Wuhan, China
² Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, 510006, Guangzhou, China
³ Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Southern Nuclear Science Computing Center, South China Normal University, 510006, Guangzhou, China

^c bwzhang@mail.ccnu.edu.cn

Received: 6 June 2021
Accepted: 19 April 2022
Published online: 7 May 2022

Abstract

We carry out the first theoretical investigation on yields and the hardest parton splitting of large-radius jets reclustered from small radius ( $R = 0.2$ $$R=0.2$$ ) anti- $k_{t}$ $$k_t$$ jets in Pb + Pb collisions, and confront them with the recent ATLAS measurements. The Linear Boltzmann Transport (LBT) model is employed for jet propagation and jet-induced medium excitation in the hot-dense medium. We demonstrate that, with their complex structures, the medium suppression of the reclustered large radius jets at $R = 1$ $$R=1$$ is larger than that of inclusive $R = 0.4$ $$R=0.4$$ jets defined conventionally. The large radius jet constituents are reclustered with the $k_{t}$ $$k_t$$ algorithm to obtain the splitting scale $\sqrt{d_{12}}$ $\sqrt{d_{12}}$ , which characterizes the transverse momentum scale for the hardest splitting in the jet. The large-radius jet production as a function of the splitting scale $\sqrt{d_{12}}$ $\sqrt{d_{12}}$ of the hardest parton splitting is overall suppressed in Pb + Pb relative to p + p collisions due to the reduction of jets yields. A detailed analyses show that the alterations of jet substructures in Pb + Pb also make significant contribution to the splitting scale $\sqrt{d_{12}}$ $\sqrt{d_{12}}$ dependence of the nuclear modification factor $R_{AA}$ $R_{AA}$ . Numerical results for the medium modifications of the jet splitting angle $Δ R_{12}$ $\Delta R_{12}$ and the splitting fraction z are also presented.

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