2022/04/29 by Yin Cheng, Qiang Zhao, Q. Zhao · 2 citations
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research
paper · pdf · doi:10.1103/physrevd.105.076023
Based on the one-state assumption of \ensuremathη(1405) and \ensuremathη(1475), \ensuremathη(1295) and \ensuremathη(1405/1475) thus being organized as the first radial excitations of \ensuremathη and \ensuremathη^\ensuremath', respectively, we investigate the productions and radiative decays of these two states in J/\ensuremathψ\ensuremath→\ensuremathγ\ensuremathηX\ensuremath→\ensuremathγ\ensuremathγV, where \ensuremathηX stands for \ensuremathη(1295) and \ensuremathη(1405/1475) and V stands for vector mesons \ensuremathρ0, \ensuremathω, \ensuremathφ. As we have learned from previous studies that the hadronic decays of these two states receive important contributions from the intermediate KK*+c.c. meson loops due to the triangle singularity mechanism, we show that some measurable effects can also arise from the KK*+c.c. meson loops in their radiative decays. Our calculation shows that the impact of the KK*+c.c. meson loops on the \ensuremathη(1405/1475) radiative decays is relatively smaller than on \ensuremathη(1295) since the latter has a much larger coupling to KK*+c.c. However, the production of \ensuremathη(1295) in the J/\ensuremathψ radiative decays will be strongly suppressed due to its being the radial excitation state of the \ensuremathη meson. As a consequence of the KK*+c.c. meson loop contributions, we find that the mixing angle extracted in the radiative decays of \ensuremathη(1295) and \ensuremathη(1405/1475) will be different from each other, and both are different from the one determined in other processes.