Lattice QCD study of $Λ_c Λ_c$ scattering

Abstract

We present the first lattice result of the near threshold $Λ_cΛ_c$ scattering with $I(J^P) = 0(0^+)$. The calculation is performed on two $N_f = 2+1$ Wilson-Clover ensembles with pion mass $m_π\sim 303$\,MeV and lattice spacing $a = 0.07746$\,fm. The Lüscher's finite volume method is utilized to extract the scattering parameters from the finite-volume spectrum. The coupled channel $Ξ_{cc}N$ is ignored in the scattering analysis based on the observation that the energy levels computed from the $Λ_cΛ_c$ and $Ξ_{cc}N$ operators do not mix. The $Σ_cΣ_c$ channel is not included either since the energy range explored in this study is well below its threshold. Our results indicate that the interaction in the $Λ_cΛ_c$ single channel is repulsive, and the scattering length is determined to be $a_0 = -0.21(4)(8)$\,fm, where the first error is the statistical error and the second is the systematic error.