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Nuclear Theory·nucl-th

Wednesday·August 1, 2018

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    and spin interaction with meson fields generated by the baryon current in high energy nuclear collisions

    L. P. Csernai🇳🇴 · J. I. Kapusta🇺🇸 · T. Welle🇺🇸

    We propose a dynamical mechanism which provides an interaction between the spins of hyperons and antihyperons and the vorticity of the baryon current in noncentral high energy nuclear collisions. The interaction is mediated by massive vector and scalar bosons which is well known to describe the nuclear spin-orbit force. It follows from the Foldy-Wouthuysen transformation and leads to a strong-interaction Zeeman effect. The interaction may explain the difference in polarizations of and hyperons as measured by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider. The signs and magnitudes of the meson-baryon couplings are closely connected to the binding energies of hypernuclei and to the abundance of hyperons in neutron stars.

    nucl-thPRC(2019)·69 citations
  2. 02

    Shells in a Toroidal Nucleus in the Intermediate Mass Region

    Cheuk-Yin Wong🇺🇸 · Andrzej Staszczak🇵🇱

    Attention is fixed on shells in toroidal nuclei in the intermediate mass region using a toroidal single-particle potential. We find that there are toroidal shells in the intermediate mass region with large single-particle energy gaps at various nucleon numbers located at different toroidal deformations characterized by the aspect ratios of toroidal major to minor radius. These toroidal shells provide extra stability at various toroidal deformations. Relative to a toroidal core, Bohr-Mottelson spin-aligning particle-hole excitations may be constructed to occupy the lowest single-particle Routhian energies to lead to toroidal high-spin isomers with different spins. Furthermore, as a nucleon in a toroidal nucleus possesses a vorticity quantum number, toroidal vortex nuclei may be constructed by making particle-hole excitations in which nucleons of one type of vorticity are promoted to populate un-occupied single-particle orbitals of the opposite vorticity. Methods for producing toroidal high-spin isomers and toroidal vortex nuclei are discussed.

    nucl-thnucl-exPRC(2018)·4 citations
  3. 03

    Accessing quark helicity in and SIDIS via dihadron correlations

    Hrayr H. Matevosyan🇦🇺

    The correlation between the longitudinal polarization of a fragmenting quark and the transverse momenta of the produced hadrons was predicted over two decades ago. Nevertheless, experimental searches in the electron-positron annihilation process, both through the so-called jet handedness measurements by the {\tt SLD} Collaboration and more recently via the measurements of the azimuthal asymmetry containing the helicity-dependent dihadron fragmentation function (DiFF) by the Collaboration, did not yield a signal. We will first discuss our recent explanation of the zero result at , and the two new methods for accessing the helicity-dependent DiFFs both in the electron-positron annihilation experiments, and in the semi-inclusive deep inelastic scattering (SIDIS) experiments with a longitudinally polarized target. We will also for the first time describe yet another, new method for accessing the helicity-dependent DiFFs in SIDIS using polarized beam asymmetry. Finally, we will present a new Monte Carlo calculation of the specific Fourier moments of the helicity-dependent DiFF entering in to the new asymmetries, performed within the extended quark-jet model, and compare the results to those for the interference DiFF.

    ↳ hep-phhep-exnucl-thPoS(2018)·4 citations
  4. 04

    Fermionic spectral functions with the Functional Renormalization Group

    Ralf-Arno Tripolt🇮🇹 · Johannes Weyrich🇩🇪 · Lorenz von Smekal🇩🇪 · Jochen Wambach🇮🇹

    We present first results on the calculation of fermionic spectral functions from analytically continued flow equations within the Functional Renormalization Group approach. Our method is based on the same analytic continuation from imaginary to real frequencies that was developed and used previously for bosonic spectral functions. In order to demonstrate the applicability of the method also for fermionic correlations we apply it here to the real-time quark propagator in the quark-meson model and calculate the corresponding quark spectral functions in the vacuum.

    ↳ hep-phhep-thnucl-thPRD(2018)·32 citations
  5. 05

    Gradient resummation for nonlinear chiral transport: an insight from holography

    Yanyan Bu🇨🇳 · Tuna Demircik🇮🇱 · Michael Lublinsky🇮🇱

    Nonlinear transport phenomena induced by chiral anomaly are explored within a 4D field theory defined holographically as Maxwell-Chern-Simons theory in Schwarzschild-. In presence of weak constant background electromagnetic fields, the constitutive relations for vector and axial currents, resummed to all orders in the gradients of charge densities, are encoded in nine momenta-dependent transport coefficient functions (TCFs). These TCFs are first calculated analytically up to third order in gradient expansion, and then evaluated numerically beyond the hydrodynamic limit. Fourier transformed, the TCFs become memory functions. The memory function of the chiral magnetic effect (CME) is found to differ dramatically from the instantaneous response form of the original CME. Beyond hydrodynamic limit and when external magnetic field is larger than some critical value, the chiral magnetic wave (CMW) is discovered to possess a discrete spectrum of non-dissipative modes.

    ↳ hep-thhep-phnucl-thEPJC(2019)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE