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Nuclear Theory·nucl-th

Monday·February 28, 2022

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 01

    Constraints on the Lambda-neutron interaction from charge-symmetry breaking of A=4 hypernuclei

    Andreas Nogga🇩🇪 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪

    We include the leading charge symmetry breaking contributions into the hyperon-nucleon interactions derived within chiral effective field theory up to next-to-leading order. Two low energy constants are determined using the experimentally known differences of Lambda separation energies of 4-Lambda-He and 4-Lambda-H. This allows one to predict the Lambda-neutron scattering lengths for the first time based on data. Various sources of uncertainty are discussed.

    nucl-thPoS(2024)·0 citations
  2. 02

    Canonical and phenomenological formulations of spin hydrodynamics

    Asaad Daher🇵🇱 · Arpan Das🇵🇱 · Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱

    Two formulations of relativistic hydrodynamics of particles with spin 1/2 are compared. The first approach, dubbed the canonical one, uses expressions for the energy-momentum and spin tensors that have properties that follow a direct application of Noether's theorem, which yields a totally antisymmetric spin tensor. The other one is based on a simplified form of the spin tensor and is commonly used in the current literature under the name of a phenomenological approach. We show that these two frameworks are equivalent, i.e., they can be directly connected by a suitably defined pseudogauge transformation, only if the first framework is initially improved by a suitable modification of the energy-momentum tensor (addition of a divergence-free term that cannot be interpreted as a pseudogauge). Our analysis uses arguments related to the positivity of entropy production. The latter turns out to be equivalent for the improved canonical and phenomenological frameworks.

    nucl-thhep-phPRC(2023)·65 citations
  3. 03

    Hadronization and Color Transparency

    Kai gallmeister🇩🇪 · Ulrich Mosel🇩🇪

    In this article we review our work on the production of hadrons in the nuclear environment. We work with a string-breaking model for the initial production of hadrons and with a quantum-kinetic transport model (GiBUU) to describe the final state interactions of the newly formed (pre)hadrons. The latter are determined both by the formation times and by the time-development of the hadron-hadron cross section. We first show that only a linear time-dependence is able to describe the available hadronization data. We then compare with detailed data from HERMES and JLAB; very good agreement is reached in all reactions studied without any tuning of parameters. We also repeat predictions of spectra for pions and kaons at JLAB@12GeV. We finally explain the absence of CT effects in the recent experiment on proton transparencies in quasielastic (QE) events on nuclei. We propose to look instead for CT effects on protons in semi-inclusive DIS (SIDIS) events.

    nucl-thhep-exhep-phnucl-exMDPI Physics(2022)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE