Nuclear Theory·nucl-th
4 papers—2 primary·2 cross-listed
In this contribution, we present the open-flavor strong decays of light baryons computed within the framework of quark model. The transition amplitudes are computed using a modified operator, where a mechanism strange suppression is taken into account. Also we discus the strange suppression within an extension of the quark model.
Ling-Yun Dai🇩🇪 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪
Results for the antinucleon-nucleon () interaction obtained at next-to-next-to-next-to-leading order in chiral effective field theory (EFT) are reported. A new local regularization scheme is used for the pion-exchange contributions that has been recently suggested and applied in a pertinent study of the force within chiral EFT. Furthermore, an alternative strategy for estimating the uncertainty is utilized that no longer depends on a variation of the cutoffs. The low-energy constants associated with the arising contact terms are fixed by a fit to the phase shifts and inelasticities provided by a phase-shift analysis of scattering data. An excellent description of the amplitudes is achieved at the highest order considered. Moreover, because of the quantitative reproduction of partial waves up to , there is also a nice agreement on the level of observables. Specifically, total and integrated elastic and charge-exchange cross sections agree well with the results from the partial-wave analysis up to laboratory energies of MeV, while differential cross sections and analyzing powers are described quantitatively up to - MeV. The low-energy structure of the amplitudes is also considered and compared to data from antiprotonic hydrogen.
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