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Nuclear Theory·nucl-th

Monday·May 23, 2022

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    Exploring the effects of Delta Baryons in magnetars

    K. D. Marquez🇧🇷 · M. R. Pelicer🇧🇷 · S. Ghosh🇮🇳 · J. Peterson🇺🇸 · D. Chatterjee🇮🇳 · V. Dexheimer🇺🇸 · D. P. Menezes🇧🇷

    Strong magnetic fields can modify the microscopic composition of matter with consequences on stellar macroscopic properties. Within this context, we study, for the first time, the possibility of the appearance of spin-3/2 baryons in magnetars. We make use of two different relativistic models for the equation of state of dense matter under the influence of strong magnetic fields considering the effects of Landau levels and the anomalous magnetic moment (AMM) proportional to the spin of all baryons and leptons. In particular, we analyze the effects of the AMM of baryons in dense matter for the first time. {We also obtain global properties corresponding to the EoS models numerically and study the corresponding role of the baryons.} We find that they are favored over hyperons, which causes an increase in isopin asymmetry and a decrease in spin polarization. We also find that, contrary to what generally occurs when new degrees of freedom are introduced, the s do not make the EoS significantly softer and magnetars less massive. Finally, the magnetic field distribution inside a given star is not affected by the presence of s.

    ↳ astro-ph.HEhep-phnucl-thPRC(2022)·20 citations
  2. 07

    Ratio of baryon and electric-charge cumulants at second order with acceptance corrections

    Masakiyo Kitazawa🇯🇵 · ShinIchi Esumi🇯🇵 · Toshihiro Nonaka🇯🇵

    We evaluate the ratio of baryon and electric-charge cumulants at second order from the recent experimental results at GeV by the STAR Collaboration. The baryon number cumulant is reconstructed from the proton number distribution, and effects of the finite acceptance on the transverse momentum are corrected assuming the independent particle emission. We show that the obtained ratio has a dependence on the rapidity window. Comparison of the result with the hadron resonance gas model and lattice QCD numerical simulations suggests that if the fluctuations are generated from a thermal medium its temperature is significantly lower than the chemical freezeout temperature.

    ↳ hep-phnucl-exnucl-thNPA(2023)·4 citations
  3. 08

    First results from the INDRA-FAZIA apparatus on isospin diffusion in Ni+Ni systems at Fermi energies

    C. Ciampi · S. Piantelli · G. Casini · G. Pasquali · J. Quicray · L. Baldesi · S. Barlini · B. Borderie · R. Bougault · A. Camaiani · A. Chbihi · D. Dell'Aquila and 34 other authors

    An investigation of the isospin equilibration process in the reactions Ni+Ni at two bombarding energies in the Fermi regime (MeV/nucleon and MeV/nucleon) is presented. Data have been acquired during the first experimental campaign of the coupled INDRA-FAZIA apparatus in GANIL. Selecting from peripheral to semi-central collisions, both the neutron content of the quasiprojectile residue and that of the light ejectiles coming from the quasiprojectile evaporation have been used as probes of the dynamical process of isospin diffusion between projectile and target for the asymmetric systems. The isospin transport ratio technique has been employed. The relaxation of the initial isospin imbalance with increasing centrality has been clearly evidenced. The isospin equilibration appears stronger for the reactions at MeV/nucleon, as expected due to the longer projectile-target interaction time than at MeV/nucleon. Coherent indications of isospin equilibration come from the quasiprojectile residue characteristics and from particles ascribed to the quasiprojectile decay.

    ↳ nucl-exnucl-thPRC(2022)·28 citations
  4. 09

    Response of a baryon-charged medium to energetic partons

    Lipei Du (McGill U., Ohio State U.)🇨🇦 · Ulrich Heinz (Ohio State U.)🇺🇸

    We explore the response to energetic partons of a baryon-charged medium produced in low energy heavy-ion collisions in which the partonic energy loss rate is expected to depend on both temperature and baryon chemical potential. The energy and momentum deposited by the partons are described by dynamical sources added to hydrodynamic equations of motion. We study the distortions of various hydrodynamic quantities, especially the energy and baryon densities, induced by energetic partons plowing through the medium. By studying the contribution from this medium response to the emission spectra of several identified hadron species we identify qualitative differences between the jet-induced modifications for mesons and net protons.

    ↳ hep-phnucl-thPRC(2022)·7 citations
  5. 10

    Heavy quarkonium dynamics at next-to-leading order in the binding energy over temperature

    Nora Brambilla🇩🇪 · Miguel Ángel Escobedo🇪🇸 · Ajaharul Islam🇺🇸 · Michael Strickland🇺🇸 · Anurag Tiwari🇺🇸 · Antonio Vairo🇩🇪 · Peter Vander Griend🇩🇪

    Using the potential non-relativistic quantum chromodynamics (pNRQCD) effective field theory, we derive a Lindblad equation for the evolution of the heavy-quarkonium reduced density matrix that is accurate to next-to-leading order (NLO) in the ratio of the binding energy of the state to the temperature of the medium. The resulting NLO Lindblad equation can be used to more reliably describe heavy-quarkonium evolution in the quark-gluon plasma at low temperatures compared to the leading-order truncation. For phenomenological application, we numerically solve the resulting NLO Lindblad equation using the quantum trajectories algorithm. To achieve this, we map the solution of the three-dimensional Lindblad equation to the solution of an ensemble of one-dimensional Schrödinger evolutions with Monte-Carlo sampled quantum jumps. Averaging over the Monte-Carlo sampled quantum jumps, we obtain the solution to the NLO Lindblad equation without truncation in the angular momentum quantum number of the states considered. We also consider the evolution of the system using only the complex effective Hamiltonian without stochastic jumps and find that this provides a reliable approximation for the ground state survival probability at LO and NLO. Finally, we make comparisons with our prior leading-order pNRQCD results and experimental data available from the ATLAS, ALICE, and CMS collaborations.

    ↳ hep-phnucl-exnucl-thphysics.comp-phJHEP(2022)·59 citations

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first authorsco-authorsvia INSPIRE