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

Abstract

We carry out the first theoretical investigation on yields and the hardest parton splitting of large-radius jets reclustered from small radius ($R=0.2$) anti-$k_t$ 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 $R=1$ is larger than that of inclusive $R=0.4$ jets defined conventionally. The large radius jet constituents are reclustered with the $k_t$ algorithm to obtain the splitting scale $\sqrt{d_{12}}$, 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 $\sqrt{d_{12}}$ 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 $\sqrt{d_{12}}$ dependence of the nuclear modification factor $R_{AA}$. Numerical results for the medium modifications of the jet splitting angle $\Delta R_{12}$ and the splitting fraction $z$ are also presented.

11 pages, 10 figures

References in corpus (15)

• An Introduction to PYTHIA 8.2
• Effects of initial flow velocity fluctuation in event-by-event (3+1)D hydrodynamics
• Radiative and Collisional Jet Energy Loss in the Quark-Gluon Plasma at RHIC
• Dihadron Tomography of High-Energy Nuclear Collisions in NLO pQCD
• Medium response in JEWEL and its impact on jet shape observables in heavy ion collisions
• A theory of jet shapes and cross sections: from hadrons to nuclei
• Tomography of high-energy nuclear collisions with photon-hadron correlations
• Mach cone induced by $\gamma$-triggered jets in high-energy heavy-ion collisions
• Analytical and numerical Gubser solutions of the second-order hydrodynamics
• Towards jet tomography: gamma-hadron correlations
• The physics of $Z^0/{\gamma }^{\ast }$-tagged jets at the LHC
• Medium modification of $\gamma$-jet fragmentation functions in Pb+Pb collisions at LHC
• Liquid-Liquid Critical Point in Phosphorus
• Disentangling Jet Modification in Jet Simulations and in Z+Jet Data
• Detection loophole in quantum causality and its countermeasures

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