Abstract
The decay width of is as large as that of . This is in evident conflict with simple expectations based on flavor symmetry and phase space. Similarly, the decay width of is larger than predicted by flavor symmetry. In this work, we propose that the axial anomaly is responsible for an enhanced coupling of (some) excited baryons to the meson. We test this idea by including a new, chirally symmetric but anomalous, term in an effective hadronic model describing baryons and their chiral partners in the mirror assignment. This term enhances the decay of the chiral partners into baryons and an meson, such as . Moreover, a strong coupling of to emerges (this is important for studies of production processes). Our approach shows that is predominantly the chiral partner of , and the chiral partner of . Finally, our formalism can be used to couple the pseudoscalar glueball to baryons. We expect a large cross section for the reaction , which can be experimentally tested in the future PANDA experiment.
- Received 8 August 2017
DOI:https://doi.org/10.1103/PhysRevD.97.014007
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society