https://doi.org/10.1140/epjc/s10052-012-2180-1
Regular Article - Theoretical Physics
Chiral baryon fields in the QCD sum rule
School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China
* e-mail: hxchen@buaa.edu.cn
Received:
21
August
2012
Revised:
23
September
2012
Published online:
19
October
2012
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 ![$[(\mathbf{3},\bar{\mathbf{3}}) \oplus(\bar{\mathbf{3}}, \mathbf{3})]$](/articles/epjc/abs/2012/10/10052_2012_Article_2180/10052_2012_Article_2180_tex_eq1.png)
and [(8,1)⊕(1,8)] and the decuplet baryon fields belonging to the chiral representations [(3,6)⊕(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.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2012
