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Nuclear Theory·nucl-th

Tuesday·May 12, 2026

12 papers—3 primary·9 cross-listed

All12Primary3Cross-lists9
  1. 01

    Probing Jet-Medium Interactions in Heavy-Ion Collisions Using Energy-Energy Correlators

    Rushil Saraswat · Aditya Prasad Dash · Huan Zhong Huang · Gang Wang · Xin-Nian Wang · Zhong Yang

    Energy-energy correlators (EECs) provide a sensitive probe of both perturbative and nonperturbative dynamics in relativistic heavy-ion collisions. Jet-medium interactions enhance particle multiplicity within the jet cone, which must be properly accounted for when extracting the EEC of jet shower hadrons in experiments. To address this issue, we develop an augmentation method that exploits momentum conservation between the near-side and away-side regions, using -jet events with 0-10\% centrality in Pb+Pb collisions at TeV simulated with the CoLBT-hydro model. This approach yields an experimentally reconstructed EEC that shows improved agreement with the EEC of hadrons originating primarily from jet parton splittings. Comparing EECs of jets from Pb+Pb and p+p collisions with different matching conditions can be sensitive to jet medium interaction dynamics, and provide a novel means to test the scenario of jet energy loss in the QGP, followed by fragmentations outside the QGP.

    nucl-thhep-phnucl-ex0 citations
  2. 02

    Modeling polarization in AuAu collisions at GeV using relativistic spin hydrodynamics

    Matteo Buzzegoli🇷🇴 · Aleksandar Gecic🇷🇴 · Rajeev Singh🇷🇴

    We investigate spin polarization dynamics in relativistic heavy-ion collisions using ideal relativistic spin hydrodynamics, employing non-boost-invariant longitudinal solutions as the hydrodynamic background. Operating in the small-polarization regime, where spin evolves perturbatively on top of the bulk expansion, we first analyze a D setup with transverse homogeneity. In this framework, symmetry-constrained initial conditions for the spin potential lead to non-trivial evolution and generate both local and global hyperon polarization consistent with qualitative experimental trends, though they fail to reproduce observed azimuthal structures. To address this limitation, we extend the framework by incorporating transverse flow and spatial anisotropy at freeze-out, constructing a D model that preserves the longitudinal dynamics. We demonstrate that the inclusion of a longitudinal spin acceleration component, coupled with transverse expansion, results in the emergence of a quadrupole pattern in the longitudinal polarization. The resulting momentum-dependent and integrated observables exhibit qualitative and reasonably good quantitative agreement with experimental data for Au+Au collisions at GeV. Finally, we provide predictions for the in-plane transverse spin polarization, an observable that, to our knowledge, has not yet been experimentally measured.

    nucl-thhep-ph0 citations
  3. 03

    New perspective on cold fusion reactions: A microscopic description

    Yinu Zhang · Bo Han · Yueping Fang · Long Zhu

    A microscopic framework that combines the Hartree-Fock-Bogoliubov (HFB) approach with the fusion by diffusion (FBD) model is proposed to investigate the synthesis mechanism of superheavy nuclei (SHN). For the reaction , the calculated evaporation-residue cross section (ERCS) reproduces the experimental data reasonably well. The method enables self-consistent extraction of the fusion injection point and inner barrier from HFB potential-energy surfaces (PES), thereby incorporating nuclear structure effects while eliminating phenomenological tuning at the fusion stage. For cold-fusion reactions, the PES features a hyperasymmetric valley driven by shell effects. This Pb anchored valley connects the entrance channel to compound nucleus formation and provides an exit channel for cluster decay. We further investigate the cold-fusion reactions and , obtaining a near-exponential decrease of with compound-nucleus charge , consistent with established systematics. This approach demonstrates a self-consistent framework that can reduce uncertainties in the fusion stage of SHN production.

    nucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE