Speaker
Description
Interactions between a nucleon and a meson containing a heavy antiquark, in which quark-antiquark annihilation is absent, have been predicted to be attractive and to form genuine pentaquark states. With realistic lattice QCD simulations for such systems now feasible, first-principles determination of these interactions can provide theoretical prediction for the existence of the pentaquarks.
We investigate kaon-nucleon ($KN$) interaction and its charm-sector counterpart, $\bar{D}$ meson-nucleon ($\bar{D}N$) interaction. The calculation is performed using the configurations at the physical point, $m_{\pi}\approx 137$ MeV. S-wave interaction potentials are extracted via the time-dependent HAL QCD method.
In this talk, I will present the resulting potentials and scattering phase shifts, and discuss the absence of pentaquarks. Furthermore, I will compare the two channels and discuss the underlying physical mechanisms of the interactions.
