Zobrazeno 1 - 10
of 1 521
pro vyhledávání: '"Meißner, U. G."'
We work out the spatial density distributions corresponding to the axial-vector charge density operator for spin-1/2 systems using states described by sharply localized wave packets in arbitrary Lorentz-frames. The static approximation, leading to th
Externí odkaz:
http://arxiv.org/abs/2412.05050
Autor:
Haidenbauer, J., Meißner, U. -G.
Near-threshold $p\bar\Lambda$ mass spectra for the reactions $e^+e^- \to K^- p\bar\Lambda$ and $J/\psi \to K^- p\bar\Lambda$ are investigated with an emphasis on the role played by the interaction in the $p\bar\Lambda$ system. As guideline for the $p
Externí odkaz:
http://arxiv.org/abs/2403.18706
The gravitational form factors of the transition from the proton to the $\Delta^+$ resonance are calculated to leading one-loop order using a manifestly Lorentz-invariant formulation of chiral perturbation theory. We take into account the leading ele
Externí odkaz:
http://arxiv.org/abs/2312.05193
The matrix elements of the electromagnetic current and the energy-momentum tensor for sharply localized states of spin-1 systems are considered. Their interpretation as local spatial densities of various characteristics of the considered system is di
Externí odkaz:
http://arxiv.org/abs/2305.01491
Publikováno v:
JHEP02(2023)163
The definition of local spatial densities by using sharply localized one-particle states is applied to spin-3/2 systems. Matrix elements of the electromagnetic current and the energy-momentum tensor are considered and integral expressions of associat
Externí odkaz:
http://arxiv.org/abs/2212.11505
Publikováno v:
Eur.Phys.J.C 83 (2023) 7, 617
We work out details of defining the spatial densities corresponding to the gravitational form factors of spin-0 and spin-1/2 systems using spherically symmetric sharply localized wave packets. The expressions for the spatial densities are provided in
Externí odkaz:
http://arxiv.org/abs/2211.09596
The leading one-loop corrections to the gravitational form factors of the delta resonance are calculated in the framework of chiral effective field theory. Various contributions to the energy-momentum tensor and the renormalization of the low-energy
Externí odkaz:
http://arxiv.org/abs/2209.01233
Autor:
Haidenbauer, J., Meißner, U. -G.
The J\"ulich-Bonn group aims at an extensive study of the baryon-baryon ($BB$) interaction involving strange baryons ($\Lambda$, $\Sigma$, $\Xi$) within SU(3) chiral effective field theory. An overview of achievements and new developments over the pa
Externí odkaz:
http://arxiv.org/abs/2208.13542
An unambiguous definition of the electromagnetic spatial densities for a spin-1/2 system is proposed and worked out in the zero average momentum frame and in moving frames. The obtained results are compared with the traditional definition of the dens
Externí odkaz:
http://arxiv.org/abs/2205.15061
Autor:
Haidenbauer, J., Meißner, U. -G.
Studies of the baryon-baryon interaction involving hyperons within chiral effective field theory, so far performed up to next-to-leading order (NLO) in the chiral expansion, have shown that for the strangeness $S=-1$ ($\Lambda N$, $\Sigma N$) and $S=
Externí odkaz:
http://arxiv.org/abs/2201.08238