منابع مشابه
47 v 1 3 0 O ct 1 99 6 Preprint Numbers : ANL - PHY - 8585 - TH - 96 TRI - PP - 96 - 63 K l 3 and π e 3 transition form factors
Kl3 and πe3 transition form factors are calculated as an application of DysonSchwinger equations. The role of nonanalytic contributions to the quark–W-boson vertex is elucidated. A one-parameter model for this vertex provides a uniformly good description of these transitions, including the value of the scalar form factor of the kaon at the Callan-Treiman point. The Kl3 form factors, f K ± , are...
متن کاملMeson Elastic and Transition Form Factors
The Dyson–Schwinger equations of QCD, truncated to ladder-rainbow level, are used to calculate meson form factors in impulse approximation. The infrared strength of the ladder-rainbow kernel is described by two parameters fitted to the chiral condensate and fπ; the ultraviolet behavior is fixed by the QCD running coupling. This obtained elastic form factors Fπ(Q) and FK(Q ) agree well with the ...
متن کاملAxial anomaly and transition form factors.
We investigate the properties of the amplitude induced by the anomaly. In a relatively high energy region those amplitudes are constructed by the vector meson poles and the anomaly terms, in which the anomaly terms can be essentially evaluated by the triangle quark graph. We pay our attention to the anomaly term and make intensive analysis of the existing experimental data, i.e., the electromag...
متن کاملNucleon Transition Form Factors and New Perspectives
The status of the electro-excitation program to study baryon resonances at Jefferson Lab will be exemplified by the most recent results on resonance parameters and transition form factors in single and double-pion production. These results demonstrate that the separation of resonance and background contributions and therefore the extraction of the electro-coupling amplitudes of resonances becom...
متن کاملHeavy to light baryon transition form factors.
Recently, Stech found form factor relations for heavy to light transitions based on two simple dynamical assumptions for spectator partical. In this work we generalize his approach to the case of baryons and find that for ΛQ → Λ (Q=b or c) only one independent form factor remains in limit mQ → ∞. Furthermore, combining with the model of Guo and Kroll we determine both of the two form factors fo...
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: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)00271-2