Chiral baryon fields in the QCD sum rule

We study the structure of local baryon fields using the method of QCD sum rule. We only consider the single baryon fields and calculate their operator product expansions. We find that the octet baryon fields belonging to the chiral representations [(3, (3) over bar) circle plus ((3) over bar, 3)] and [(8, 1) circle plus (1, 8)] and the decuplet baryon fields belonging to the chiral representations [(3, 6) circle plus (6, 3)] lead to the baryon masses which are consistent with the experimental data of ground baryon masses. We also calculate their decay constants, check our normalizations for baryon fields in Chen et al. (Phys. Rev. D 81: 054002, 2009) and find that they are well-defined.