Year: 2020
Type: article
Abstract: We study the ${\mathrm{\ensuremath{\Lambda}}}_{c}N$ interaction in the covariant chiral effective field theory (ChEFT) at leading order. All the relevant low-energy constants are determined by fitting to the lattice QCD simulations from the HAL QCD Collaboration. Extrapolating the results to the physical point, we show that the ${\mathrm{\ensuremath{\Lambda}}}_{c}N$ interaction is weakly attractive in the $^{1}S_{0}$ channel, but in the $^{3}S_{1}$ channel it is only attractive at extremely low energies and soon turns repulsive for larger laboratory energy. Furthermore, we show that the neglect of the $^{3}S_{1}\text{\ensuremath{-}}^{3}D_{1}$ coupling provided by the leading-order covariant ChEFT would result in an attractive interaction in the $^{3}S_{1}$ channel at the physical point, which coincides with the previous nonrelativistic ChEFT study. As a byproduct, we predict the $^{3}D_{1}$ phase shifts and the mixing angel ${\ensuremath{\varepsilon}}_{1}$, which can be checked by future lattice QCD simulations. In addition, we compare the ${\mathrm{\ensuremath{\Lambda}}}_{c}N$ interaction with the $\mathrm{\ensuremath{\Lambda}}N$ and $NN$ interactions to study how the baryon-nucleon ($BN$) interactions evolve as a function of the baryon mass with the replacement of a light quark by a strange or charm quark in the baryon ($B$).
Source: Physical Review C
Institutions: Beihang University, Centre National de la Recherche Scientifique, Université Paris-Saclay, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, Ministry of Industry and Information Technology, Zhengzhou University
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3093028367