π-η mixing from QCD sum rules
نویسندگان
چکیده
منابع مشابه
Π-η Mixing from Qcd Sum Rules
The q2 dependence of the π-η mixing amplitude is examined with the use of QCD sum rules. The linear slope of the mixing function θ(q2) is found to be much smaller than that for ρ-ω mixing. Thus the mixing amplitude is approximately the same in the space-like region as in the time-like one, and one may neglect the q2 dependence of the mixing. A comparison between a hadron-meson, an effective chi...
متن کاملπ with light - cone QCD sum rules
In this article, we take the point of view that the light scalar meson a0(980) is a conventional qq̄ state, and calculate the coupling constants ga0ηπ0 and ga0η′π0 with the light-cone QCD sum rules. The central value of the coupling constant ga0ηπ0 is consistent with the one extracted from the radiative decay φ(1020) → a0(980)γ → ηπ0γ. The central value and lower bound of the decay width Γa0→ηπ0...
متن کاملTHE SEMILEPTONIC DECAYS D → π(ρ)eν AND B → π(ρ)eν FROM QCD SUM RULES
We investigate the semileptonic decays of B and D mesons into π and ρ mesons, respectively, by means of QCD sum rules. We find that for the vector formfactors involved the pole dominance hypothesis is valid to good accuracy with pole masses in the expected range. Pole dominance, however, does not apply to the axial formfactors which results in specific predictions for the predominant polarizati...
متن کاملTransition Form Factor γγ ∗ → π 0 and QCD sum rules
The transition γ * (q 1)γ * (q 2) → π • (p) is studied within the QCD sum rule framework. As a first step, we analyze the kinematic situation when both photon virtualities are spacelike and large. We construct a QCD sum rule for F γ * γ * π • (q 2 1 , q 2 2) and show that, in the asymptotic limit |q 2 1 |, |q 2 2 | → ∞, it reproduces the leading-order pQCD result. Then we study the limit |q 2 1...
متن کاملfBs from QCD sum rules
The decay constants of the pseudoscalar mesons B and Bs are evaluated from QCD sum rules for the pseudoscalar two-point function. Recently calculated perturbative three-loop QCD corrections are incorporated into the sum rule. An analysis in terms of the bottom quark pole mass turns out to be unreliable due to large higher order radiative corrections. On the contrary, in the MS scheme the higher...
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(94)01461-k