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Nuclear Theory·nucl-th

Monday·December 21, 2020

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    -wave dibaryon resonances in elastic scattering and near-threshold pion production

    O.A. Rubtsova🇷🇺 · V.I. Kukulin🇷🇺 · M.N. Platonova🇷🇺

    It is demonstrated within the dibaryon-induced model for interaction that scattering in waves is governed mainly by the production of the intermediate dibaryon resonances. Two dibaryon resonances with a mass of about 2200 MeV discovered recently by the ANKE-COSY Collaboration are shown to determine both elastic phase shifts and inelasticities in the and - channels from zero energy up to - GeV. It is also demonstrated clearly that the dibaryon plays a decisive role in near-threshold neutral pion production in collisions which is poorly understood to date. The missing dibaryon contribution is found to be the very possible reason for the failure of traditional approaches to explain near-threshold production.

    nucl-thhep-phPRD(2020)·6 citations
  2. 02

    CFNS Ad-Hoc meeting on Radiative Corrections Whitepaper

    Andrei Afanasev · Jaseer Ahmed · Igor Akushevich · Jan C. Bernauer · Peter G. Blunden · Andrea Bressan · Duane Byer · Ethan Cline · Markus Diefenthaler · Jan M. Friedrich · Haiyan Gao · Alexandr Ilyichev and 16 other authors

    Current precision scattering experiments and even more so many experiments planed for the Electron Ion Collider will be limited by systematics. From the theory side, a fundamental source of systematic uncertainty is the correct treatment of radiative effects. To gauge the current state of technique and knowledge, help the cross-pollination between different direction of nuclear physics, and to give input to the yellow report process, the community met in an ad-hoc workshop hosted by the Center for Frontiers in Nuclear Science, Stony Brook University. This whitepaper is a collection of contributions to this workshop.

    nucl-th6 citations
  3. 03

    Enhanced production of strange baryons in high energy nuclear collisions from a multiphase transport model

    Tianhao Shao🇨🇳 · Jinhui Chen🇨🇳 · Che Ming Ko🇺🇸 · Zi-Wei Lin🇺🇸

    We introduce additional coalescence factors for the production of strange baryons in a multiphase transport (AMPT) model in order to describe the enhanced production of multistrange hadrons observed in Pb-Pb collisions at = 2.76 TeV at the Large hadron Collider (LHC) and Au+Au collisions at = 200 GeV at Relativistic Heavy-Ion Collider (RHIC).This extended AMPT model is found to also give a reasonable description of the multiplicity dependence of the strangeness enhancement observed in high multiplicity events in collisions at = 7 TeV and -Pb collisions at = 5.02 TeV. We find that the coalescence factors depend on the system size but not much on whether the system is produced from A+A or p+A collisions. The extended AMPT model thus provides a convenient way to model the mechanism underlying the observed strangeness enhancement in collisions of both small and large systems at RHIC and LHC energies.

    nucl-thnucl-exPRC(2020)·25 citations
  4. 04

    A benchmark of initial state models for heavy-ion collisions at 27 and 62 GeV

    Jakub Cimerman · Iurii Karpenko · Boris Tomášik · Barbara Antonina Trzeciak

    Description of relativistic heavy-ion collisions at the energies of RHIC Beam Energy Scan program with fluid dynamic approach poses several challenges, one of which being a complex geometry and a longer duration of the pre-hydrodynamic stage. Therefore, existing fluid dynamic models for heavy-ion collisions at the RHIC Beam Energy Scan energies rely on rather complex initial states, such as UrQMD cascade or multi-fluid dynamics. In this study, we show that functionally simpler, non-dynamical initial states can be employed for the fluid dynamical simulations of Au-Au collisions at \mbox{\sqrt{s_{_{\rm NN}}}}=27 and 62.4~GeV. We adapt the initial states based on Monte Carlo Glauber model (GLISSANDO 2) and ansatz based on reduced thickness (TENTo ), extended into the longitudinal direction and finite baryon density. We find that both initial states, when coupled to a 3D event-by-event viscous fluid dynamic + cascade model, result in an overall fair reproduction of basic experimental data: pseudorapidity distributions, transverse momentum spectra and elliptic flow, at both collision energies. This is a rather surprising, given that the ansatz is functionally similar to the EKRT and IP-Glasma models, which are successful at much larger energies and rely on a partonic picture of the initial state.

    nucl-thnucl-exPRC(2021)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE