Speaker
Description
There exists an unresolved discrepancy regarding calculations of two-baryon interactions from lattice QCD. This difference initially began as a disagreement between two very different methods (i.e. Lüscher’s two-particle quantization condition and the HAL QCD potential method), leading to questions regarding the control over systematics within each method. For instance, Lüscher’s quantization condition relies on the two-hadron finite-volume spectrum which can be affected by unwanted excited-state contamination within a lattice QCD calculation, especially in cases where a severe signal-to-noise problem exists like in multi-baryon systems. In this talk, I will show calculations for two-lambda baryon interactions, from which the H-dibaryon binding energy can be estimated, utilizing the variational approach for extracting finite-volume energies reliably. This work includes six lattice spacings, allowing us to take a continuum limit which is found to be necessary for obtaining correct results, and marks the first time this systematic has ever been controlled in a lattice QCD calculation.
