Speaker
Etsuko Itou
(iTHEMS, RIKEN)
Description
In the vacuum of ordinary QCD, the lightest hadron is the pion, which is an isotriplet pseudoscalar meson. This can be shown using QCD inequalities, if we assume that the theory possesses gamma_5 Hermiticity and that disconnected diagrams do not contribute. However, in the finite-density regime, gamma_5 Hermiticity is lost, and this argument no longer holds. In contrast, in two-color QCD, an analogous argument based on the pseudo-reality of fermions shows that the isosinglet scalar meson becomes the lightest hadron. This naturally leads to the question: what happens to the masses of other hadrons?
In this talk, I will present results for the hadron mass spectrum obtained from first-principles calculations in two-color QCD.
Author
Etsuko Itou
(iTHEMS, RIKEN)