scholarly journals Study of the process e+e−→ π+π−π0η at the SND detector

2019 ◽  
Vol 218 ◽  
pp. 02007
Author(s):  
A.A. Botov
Keyword(s):  
Vector Meson ◽  
Cross Section ◽  
Vector Meson Dominance ◽  
Dominance Model ◽  
Vector Meson Dominance Model ◽  
Intermediate States ◽  
Reaction Proceeds

The reaction e+e−→ π+ π−π0η has been studied in the experiment with the SND detector at the VEPP-2000 e+ e− collider. The reaction proceeds via the four intermediate states: ωη, φη, a0ρ, and structureless π+π−π0η state, which may be, for example, ρ(1450) with ρ(1450) → ρ(770)η. The total e+e−→ π+π−π0η cross section and cross section for the four intermediate states have been measured and fitted in the vector meson dominance model.

scholarly journals f1(1285) → e+e- decay and direct f1 production in e+e- collisions

2018 ◽  
Vol 182 ◽  
pp. 02106
Author(s):  
A.S. Rudenko
Keyword(s):  
Vector Meson ◽  
Cross Section ◽  
Relative Phase ◽  
Charge Asymmetry ◽  
Coupling Constants ◽  
Vector Meson Dominance ◽  
Dominance Model ◽  
Vector Meson Dominance Model

The width of the f1(1285) → e+e+e- decay is calculated in the vector meson dominance model. The result depends on the relative phase between two coupling constants describing f1 → ρ0γ decay. The width Γ( f1 → e+e+e-) is estimated to be ≃ 0:07 - 0:19 eV. Direct f1 production in e+e+e- collisions is discussed, and the e+e+e- → f1 → a0π → ηππ cross section is calculated. Charge asymmetry in the e+e+e- → ηπ+π- reaction due to interference between e+e+e- → f1 and e+e+e- → ηρ0 amplitudes is studied.

scholarly journals THE ωρπ COUPLING IN THE VMD MODEL REVISITED

2012 ◽  
Vol 27 (19) ◽  
pp. 1250101 ◽  
Author(s):  
D. GARCÍA GUDIÑO ◽  
G. TOLEDO SÁNCHEZ
Keyword(s):  
Vector Meson ◽  
Decay Width ◽  
Cross Section ◽  
Weighted Average ◽  
Contact Term ◽  
Radiative Decays ◽  
Vector Meson Dominance ◽  
Dominance Model ◽  
Vector Meson Dominance Model ◽  
Definite Answer

We determine the value of the ω-ρ-π mesons coupling (gωρπ), in the context of the vector meson dominance model, from radiative decays, the ω→3π decay width and the e+e-→3π cross-section. For the last two observables we consider the effect of either a heavier resonance (ρ′(1450)) or a contact term. A weighted average of the results from the set of observables yields gωρπ = 14.7±0.1 GeV -1 in absence of those contributions, and gωρπ = 11.9 ± 0.2 GeV -1 or gωρπ = 11.7 ± 0.1 GeV -1 when including the ρ′ or contact term, respectively. The inclusion of these additional terms makes the estimates from the different observables to lay in a more reduced range. Improved measurements of these observables and the ρ′(1450) meson parameters are needed to give a definite answer on the pertinence of the inclusion of this last one in the considered processes.

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