منابع مشابه
Mesonic Form Factors
The pion electromagnetic form factor is often considered a good observable for studying the relative accuracy of perturbative and nonperturbative descriptions of QCD as the energy scale varies. It is hoped that because the pion is the lightest and simplest hadron that perturbative descriptions will remain accurate at lower energy scales than predictions for heavier and more complicated hadrons,...
متن کاملMesonic Anapole Form Factors of the Nucleons
The chiral quark model posits pseudoscalar and vector meson couplings to constituent quarks. The parity violating meson-quark couplings lead to anapole moments and form factors of the nucleons. These arise both as parity violating meson loop fluctuations as well as exchange currents and polarization currents that are induced by the parity violating interaction between quarks. Because of cancell...
متن کاملMesonic Tensor Form Factors with Light Front Quark Model
We study the tensor form factors for P → P and P → V transitions in the lightfront quark model with P and V being pseudoscalar and vector mesons, respectively. We explore the behaviors of these form factors in the entire physical range of 0 ≤ p ≤ (Mi−Mf ). At the maximum recoil of p = 0, we compare our results of the form factors in B → π,K, ρ,K with various other calculations in the literature.
متن کاملBounds on Heavy-to-Heavy Mesonic Form Factors
We provide upper and lower bounds on the form factors for B → D,D∗ by utilizing inclusive heavy quark effective theory sum rules. These bounds are calculated to leading order in ΛQCD/mQ and αs. The O(αsβ0) corrections to the bounds at zero recoil are also presented. We compare our bounds with some of the form factor models used in the literature. All the models we investigated failed to fall wi...
متن کاملMesonic Form Factors in the Light-front Quark Model
Form factors for P → P and P → V transitions due to the valence-quark configuration are calculated directly in the physical time-like range of momentum transfer within the light-front quark model. It is pointed out that the Bauer-Stech-Wirbel type of light-front wave function fails to give a correct normalization for the IsgurWise function at zero recoil in P → V transition. Some of the P → V f...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2004
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)02459-9