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Investigation on the $$Omega(2012)$$ from QCD sum rules

QCD和則による$$Omega(2012)$$の研究

Su, N.*; Chen, H.-X.*; Gubler, P. ; 保坂 淳

Su, N.*; Chen, H.-X.*; Gubler, P.; Hosaka, Atsushi

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

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