f_1(1285) → e~+ e~- decay and direct f_1 production in e~+ e~- collisions

摘要

The width of the f_1 (1285 )→ e~+e~- decay is calculated in the vector meson dominance model. The result depends on the relative phase between two coupling constants describing f_1 →ρ~0γ decay. The width Γ (f_1→ e~+e~-) is estimated to be approx-0.07-0.19 eV. Direct f_1 production in e~+e~- collisions is discussed, and the e~+e~-→ f_1 → a_0 π→ ηππ cross section is calculated. Charge asymmetry in the e~+e~-→ ηπ~+π~- reaction due to interference between e~+e~ -→ f_1 and e~+e~ -→ ηρ~0 amplitudes is studied.