Masses of Flavor Singlet Hybrid Baryons

Olaf Kittel, Glennys R. Farrar

We study the possibility that four iso-singlet baryons ${\Lambda }_s(1405)$ $J^P=1/2^{-}$, ${\Lambda }_s(1520)$ $J^P=3/2^{-}$, ${\Lambda }_c(2593)$ $J^P=1/2^{-}$ and ${\Lambda }_c(2625)$ $J^P=3/2^{-}$ are hybrids: th…