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ω Meson from Lattice QCD.
Phys Rev Lett
November 2024
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany.
Many excited states in the hadron spectrum have large branching ratios to three-hadron final states. Understanding such particles from first principles QCD requires input from lattice QCD with one-, two-, and three-meson interpolators as well as a reliable three-body formalism relating finite-volume spectra at unphysical pion mass values to the scattering amplitudes at the physical point. In this work, we provide the first-ever calculation of the resonance parameters of the ω meson from lattice QCD, including an update of the formalism through matching to effective field theories.
View Article and Find Full Text PDFParity and time-reversal violating nuclear forces with explicit -excitations.
Eur Phys J A Hadron Nucl
October 2024
Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780 Bochum, Germany.
We emphasize the usefulness of treating delta resonances as explicit degrees of freedom in applications of chiral effective field theory (EFT) to parity-violating and time-reversal-violating (PVTV) nuclear interactions. Compared with the delta-less framework, the explicit inclusion of the delta isobar allows one to resum certain types of contributions to the PVTV two-pion exchange two- and three-nucleon potentials without at the same time introducing any unknown parameters up to next-to-next-to-leading order in the EFT expansion. We provide the corresponding expressions for the delta contributions in momentum and coordinate spaces and compare the convergence of the EFT expansion in both formulations.
View Article and Find Full Text PDFGlobal Data-Driven Determination of Baryon Transition Form Factors.
Phys Rev Lett
September 2024
Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA.
Hadronic resonances emerge from strong interactions encoding the dynamics of quarks and gluons. The structure of these resonances can be probed by virtual photons parametrized in transition form factors. In this study, twelve N^{*} and Δ transition form factors at the pole are extracted from data with the center-of-mass energy from πN threshold to 1.
View Article and Find Full Text PDF70 years of hyperon spectroscopy: a review of strange Ξ, Ω baryons, and the spectrum of charmed and bottom baryons.
Rep Prog Phys
September 2024
Department of Physics, University of Florida, Gainesville, FL 32611, United States of America.
The first hyperon was discovered about 70 years ago, but the nature of these particles, particularly with regard to multistrange hyperons, and many of their properties can still be considered to be literally strange. A dedicated and successful global spectroscopy program in the 1960s and 1970s usingK-beams revealed many multistrange candidates, but the available evidence of their existence is statistically limited. For this reason, there is still much to learn about the systematics of the spectrum of excited hyperon states and what they have in common with their non-strange companions, or how they differ from the nucleon and Δ resonances.
View Article and Find Full Text PDFProduction of hypernuclei from antiproton capture within a relativistic transport model.
Eur Phys J A Hadron Nucl
March 2024
CITENI, Campus Industrial de Ferrol, Universidade da Coruña, Ferrol, 15403 Spain.
Production yields of single- hypernuclei from simulated peripheral annihilations of antiprotons after capture on various target nuclei are reported. The initial annihilation process and the production of excited hypernuclei are estimated within the GiBUU transport framework, while their deexcitation process is treated with the ABLA++ code. The yield of excited hypernuclei range from 0.
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