Two model-independent results for the momentum dependence of ϱ-ω mixing
نویسندگان
چکیده
منابع مشابه
Two Model-Independent Results for the Momentum Dependence of ρ-ω Mixing ADP-95-35/T189 nucl-th/9506024
Two model-independent results on the momentum-dependence of ρ-ω mixing are described. First, an explicit choice of interpolating fields for the vector mesons is displayed for which both the mixing in the propagator and the isospin-breaking at the nucleon-vector meson vertices (and hence also the one-vector-meson-exchange contribution to NN charge symmetry breaking) vanish identically at q2 = 0....
متن کاملMesonic Width Effects on the Momentum Dependence of the ρ− ω Mixing Matrix Element
It is shown, in a model independent way, that the large difference in ρ and ω widths gives rise to a new source of momentum dependence for the ρ−ω mixing matrix element. The q dependence arising due to the meson widths leads to a significant alteration of the result obtained in the zero-width approximation usually discussed in the literature. The origin of this strong momentum dependence lies i...
متن کامل0 ω − ρ Mixing and the ω → ππγ Decay
We reexamine the ω → π0 π0 γ decay, adding the effect of ω−ρ mixing to the amplitude calculated with the aid of chiral perturbation theory and vector meson dominance. We predict the neutral decay to occur with a width of Γ(ω → π0 π0 γ ) = (390 ± 96)eV and also analyze the effect of the ω − ρ mixing on the Γ(ω → π0 π0 γ )/Γ(ω → π+ π γ ) ratio. Several remarks on the effect of ω − ρ mixing on cer...
متن کاملl - th / 9 30 10 02 v 1 4 J an 1 99 3 The Momentum Dependence of the ρ − ω Mixing Amplitude in a Hadronic Model
The Momentum Dependence of the ρ − ω Mixing Amplitude in a Hadronic Model. We calculate the momentum dependence of the ρ−ω mixing amplitude in a purely hadronic model. The basic assumption of the model is that the mixing amplitude is generated by N ¯ N loops and thus driven entirely by the neutron-proton mass difference. The value of the amplitude at the ω-meson point is expressed in terms of o...
متن کاملThe Okamoto-Nolen-Schiffer anomaly without ρ-ω mixing
We examine the effect of isospin-violating meson-nucleon coupling constants and of π-η mixing on the binding-energy differences of mirror nuclei in a model that possesses no contribution from ρ-ω mixing. The 3He-3H bindingenergy difference is computed in a nonrelativistic approach using a realistic wave function. We find the 3He-3H binding-energy difference very sensitive to the short-distance ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(95)01208-8