2013/12/23 by L.V. Filʼkov, Fil'kov, L. V.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.1312.6567
openalex publication_date 2013/12/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using the fact that the contribution of the states with isospin I=0 in the difference of the amplitudes of the processes γγ->π+π- and γγ->π0π0 is very small, we have analyzed the dispersion sum rules for the difference between the dipole polarizabilities of the charged and neutral pions as a function of the σ-meson parameters. Then taken into account the current perturbation value of (α-β)π0=-1.9, we have found (α-β)π^(+-)=9.4--8.2 for values of the σ-meson parameter within the region: Ms=400--550 MeV, Γs=400--600 MeV, Γ\s->γγ= 0--3 keV. It has been shown that the value of the decay width of the h1(1170)- meson into γπ0 can be found if the difference (α-β)π^(+-) is reliably determined from the experiment. Estimation of the optimal value of the decay width σ->γγhas given Γ\s->γγ<0.7keV.