2014/01/10 by Shuntaro Sakai, Sakai, Shuntaro, Teiji Kunihiro +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Quantum Chromodynamics and Particle Interactions #Quantum, superfluid, helium dynamics #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.1401.2239
5pages, 3 figures, Contribution to the proceedings of XV International Conference on Hadron Spectroscopy (Hadron 2013), November 4-8 2013, Nara, Japan
openalex publication_date 2014/01/10 · arxiv created 2015/01/29 · arxiv updated 2015/01/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
It is known that the decay process η→π0π+π- in free space is possible due to the isospin-symmetry breaking in Quantum Chromodynamics (QCD), i.e., the small mass difference between u and d quarks: The small width is intimately related with the mixing property between ηand π0 mesons for which the chiral anomaly play a role. In asymmetric nuclear matter such as heavy nuclei, isospin-symmetry breaking is large and it is expected that the mixing property of the mesons changes significantly and the above-mentioned decay width of the ηcreated in such a medium may be enhanced. This is an intriguing possibility to revealing a medium effect on a hadron in nuclei. We apply the in-medium chiral perturbation theory to estimate the modification of the η-π0 mixing angle and the partial width of ηπ0π+π- in asymmetric nuclear matter as a function of the isospin asymmetry. We find that these quantities can be greatly enhanced in neutron-rich matter, which should be deteactable in experiment.