2019/08/14 by Peng-Yu Niu, Bin Zhou, Niu, Peng-Yu +2
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1908.05003
openalex publication_date 2019/08/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
By including the strong isospin symmetry breaking effects and the electromagnetic contributions between the pseudoscalar mesons, we calculate the phase shifts of the P-wave ππ and Kπ scattering up to O(p4) in the framework of the SU(3) chiral perturbation theory (ChPT) and coupled channel inverse amplitude method. We re-fit the low energy constants with the present meson-meson scattering data and derive the mass differences for the charged and neutral iso-multiplets of ρ and K*. Our results show that the mass difference between ρ^± and ρ0 is very small while the mass difference between the charged and neutral K^* can reach a relatively large value of mK*0-mK*+= 2.91+1.43-1.41 MeV. This full one-loop ChPT calculation would shed some light towards a better understanding of the long-standing puzzle about the K^* mass splitting.