Investigation on the Ω(2012) from QCD sum rules

2024/05/11 by Su, Niu, Chen, Hua-Xing, Gubler, Philipp +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2405.06958

Abstract

We study the recently observed Ω(2012) baryon in QCD sum rules. We construct the P-wave Ω baryon currents with a covariant derivative, and perform spin projection to obtain the currents with total spin 1/2 and 3/2. We then apply the parity-projected QCD sum rules to separate the contributions of the positive and negative parity states. We extract the masses of J^P = 1/2^- and 3/2^- states to be M_1/2^- = 2.07^+0.07_-0.07\rm~GeV and M_3/2^- = 2.05^+0.09_-0.10\rm~GeV. Both results are in good agreement with the experimental result. Therefore, it is likely that the Ω(2012) is a negative parity state, which is interpreted as a P-wave excited state in the quark model. However, its spin is not determined in the present analysis, which can be done by detailed study on its decay properties.

Related

• Improved prediction of the mass splitting for P-wave Ω baryons
• The Ω(2012) as a hadronic molecule
• Observation of the Ω(2012) baryon at the LHC
• Structure of the Ω^-(2012) with Hamiltonian Effective Field Theory
• QCD Sum Rule for 1/2- Baryons