Speaker
Description
I will present recent progress of baryon-baryon interaction from lattice QCD. So far, there are two methods to study the interaction: The direct method based on Luscher's finite volume formula which extracts eigen energies from the plateaux of the temporal correlation functions and the HAL QCD method which extracts observables from the non-local potential associated with the tempo-spatial correlation function. Despite that the two methods should give the same results theoretically, qualitative difference for observables has been reported numerically. In the first part of my talk, I will clarify the origin of this discrepancy and discuss the validity of both methods. In the second part of my
talk, I will discuss ΩΩ interaction in the 1S0 channel from lattice QCD using a large volume 8.1fm, and nearly physical pion mass m_pi~146 MeV. The interaction is qualitatively similar to the central potential of the nucleon-nucleon interaction, i.e., the short range repulsion and the intermediate range attraction. I will show that the attraction leads to the most strange dibaryon, di-Omega, which is located near the unitary limit.
