Speaker
Description
We study $S$-wave interactions in the $I\left(J^{p}\right)=1/2\left(1/2^{-}\right)$
$\Lambda_{c}K^{+}-pD_{s}$ system on the basis of the coupled-channel
HAL QCD method. The potentials which are faithful to QCD S-matrix
below the $ pD^{*} $ threshold are extracted from Nambu-Bethe-Salpeter
wave functions on the lattice. For the simulation, we employ the (2+1)-flavor
gauge configurations on a $\left(2.9fm\right)^{3}$ volume at $m_{\pi}\simeq700$
MeV. For the charm quark, the relativistic heavy quark action is employed
to treat its dynamics on the lattice. We present our results of the
S-wave coupled-channel potentials for the $\Lambda_{c}K^{+}-pD_{s}$
system in the $1/2\left(1/2^{-}\right)$ state as well as scattering
observables obtained from the extracted potential matrix.
