Investigation on the Ω(2012) from QCD sum rules

Abstract

We investigate the recently observed $\Omega \left(2012\right)$ baryon using QCD sum rules. By constructing P-wave Ω baryon currents and performing spin projection and parity projection, we obtain the masses of the $J^P=1/2^{-}$ and $3/2^{-}$ states as $M_{1/2^{-}}={2.07}_{-0.07}^{+0.07}\text{GeV}$ and $M_{3/2^{-}}={2.05}_{-0.10}^{+0.09}\text{GeV}$, in good agreement with experiment. This suggests that $\Omega \left(2012\right)$ is likely to be a negative parity P-wave excited state, though its spin remains undetermined and requires further study of its decay properties.