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Nuclear Theory·nucl-th

Friday·January 17, 2020

12 papers—6 primary·6 cross-listed

All12Primary6Cross-lists6
  1. 07

    Boost-invariant description of polarization within hydrodynamics with spin

    Rajeev Singh🇵🇱

    We briefly review a recently proposed formalism of perfect-fluid hydrodynamics with spin, which is a generalization of the standard hydrodynamic framework and provides a natural tool for describing the evolution of spin-polarized systems of particles with spin 1/2. It is based on the de Groot - van Leeuwen - van Weert forms of energy-momentum and spin tensors and conservation laws. Using Bjorken symmetry we show how this formalism may be used to determine observables describing the polarization of particles measured in the experiment.

    ↳ hep-phnucl-thActa Phys.Polon.Supp.(2020)·4 citations
  2. 08

    Population synthesis of helium white dwarf--red giant star mergers and the formation of lithium-rich giants and carbon stars

    Xianfei Zhang · C.Simon Jeffery · Yaguang Li · Shaolan Bi

    The formation histories of lithium-rich and carbon-rich red giants are not yet understood. It has been proposed that the merger of a helium-core white dwarf with a red giant branch star might provide a solution. We have computed an extended grid of post-merger evolution models and combined these with predictions of binary star population synthesis. The results strongly support the proposal that the merger of a helium white dwarf with a red giant branch star can provide the progenitors of both lithium-rich red clump stars and early-R carbon stars. The distribution of post-merger models in , , , the surface abundances of lithium and carbon, and the predicted space densities agree well with the observed distributions of these parameters for Li-rich and early-R stars in the Galaxy.

    ↳ astro-ph.SRnucl-thApJ(2020)·3 citations
  5. 11

    Inclusive spectra and Bose-Einstein correlations in small thermal quantum systems

    M.D. Adzhymambetov🇺🇦 · Yu.M. Sinyukov🇺🇦

    The spectra and correlation of identical particles emitted from small local-equilibrium sources are considered. The size of the system is defined by the negative part of the parabolic falling chemical potential. The analytical solution of the problem is found for the case of inclusive measurements. It is shown that in the case where the size of the system is comparable to the thermal wavelength of the particles, the spectra and correlation functions are far from the quasiclassical approximation expected for large systems, and observed femtoscopy scales (interferometry radii) will be essentially smaller than the Gaussian radii of the source. If the maximum value of the chemical potential approaches the critical one, specific for the system, one can consider the possibility of the Bose-Einstein condensation. In such a case the reduction of the intercept of the correlation function for inclusive measurements takes place. The results can be used for the searching of femtoscopy homogeneity lengths in proton-proton collisions at LHC energies.

    ↳ hep-phnucl-thPRD(2020)·1 citation
  6. 12

    Triangle Singularities and Charmonium-like States

    Feng-Kun Guo🇨🇳

    The spectrum of hadrons is important for understanding the confinement of quantum chromodynamics. Many new puzzles arose since 2003 due to the abundance of experimental discoveries with the structures in the heavy quarkonium mass region being the outstanding examples. Hadronic resonances correspond to poles of the -matrix, which has other types of singularities such as the triangle singularity due to the simultaneous on-shellness of three intermediate particles. Here we briefly discuss a few possible manifestations of triangle singularities in the physics, paying particular attention to the formalism that can be used to analyze the data for charged structures in the distributions of the reaction .

    ↳ hep-phhep-exnucl-thNucl.Phys.Rev.(2020)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE