Dipole Form Factors

1972 ◽  
Vol 29 (15) ◽  
pp. 1044-1045 ◽  
Author(s):  
C. R. Hagen ◽  
E. C. G. Sudarshan
Keyword(s):  
1999 ◽  
Vol 551 (1-2) ◽  
pp. 3-40 ◽  
Author(s):  
W Hollik ◽  
J.I Illana ◽  
S Rigolin ◽  
C Schappacher ◽  
D Stöckinger

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Zhen-Yang Wang ◽  
Jing-Juan Qi ◽  
Xin-Heng Guo

In this work, we study the BK¯ molecule in the Bethe-Salpeter (BS) equation approach. With the kernel containing one-particle-exchange diagrams and introducing two different form factors (monopole form factor and dipole form factor) in the vertex, we solve the BS equation numerically in the covariant instantaneous approximation. We investigate the isoscalar and isovector BK¯ systems, and we find that X5568 cannot be a BK¯ molecule.


2015 ◽  
Vol 24 (02) ◽  
pp. 1550008 ◽  
Author(s):  
L. Syukurilla ◽  
T. Mart

We have phenomenologically investigated the kaon photoproduction process γp → K+Λ by combining different types of hadronic form factors (HFFs) inside a covariant isobar model. We obtained the best model with the smallest χ2/N by using the dipole form factor in the Born terms and a combination of the dipole, Gaussian, as well as generalized dipole form factors in the hadronic vertices of the nucleon, kaon and hyperon resonances. By utilizing this model we found that the experimental data used in the analysis are internally consistent, whereas the behavior of differential cross-section at forward angles is not significantly affected by the variation of hadronic coupling constants (CCs) and form factor cutoffs in the model.


1971 ◽  
Vol 35 (2) ◽  
pp. 166-168 ◽  
Author(s):  
S.C. Chhajlany ◽  
L.K. Pandit ◽  
G. Rajasekaran
Keyword(s):  

2017 ◽  
Vol 32 (31) ◽  
pp. 1750185 ◽  
Author(s):  
Harleen Dahiya ◽  
Monika Randhawa

In light of the improved precision of the experimental measurements and enormous theoretical progress, the nucleon form factors have been evaluated with an aim to understand how the static properties and dynamical behavior of nucleons emerge from the theory of strong interactions between quarks. We have analyzed the vector and axial-vector nucleon form factors ([Formula: see text] and [Formula: see text]) using the spin observables in the chiral constituent quark model ([Formula: see text]CQM) which has made a significant contribution to the unraveling of the internal structure of the nucleon in the nonperturbative regime. We have also presented a comprehensive analysis of the flavor decomposition of the form factors ([Formula: see text], [Formula: see text] and [Formula: see text] for [Formula: see text]) within the framework of [Formula: see text]CQM with emphasis on the extraction of the strangeness form factors which are fundamental to determine the spin structure and test the chiral symmetry breaking effects in the nucleon. The [Formula: see text] dependence of the vector and axial-vector form factors of the nucleon has been studied using the conventional dipole form of parametrization. The results are in agreement with the available experimental data.


1992 ◽  
Vol 279 (3-4) ◽  
pp. 389-396 ◽  
Author(s):  
W. Bernreuther ◽  
T. Schröder ◽  
T.N. Pham
Keyword(s):  

1978 ◽  
Vol 31 (1) ◽  
pp. 9 ◽  
Author(s):  
WK Koo ◽  
LJ Tassie

Based on an inversion formula for the energy-weighted sum rules, a study is made of the properties of the inelastic form factors of the nucleus. The inversion formula is derived by using a simple representation of the identity operator for a restricted set of non-orthogonal states and it is applicable to both isoscalar and isovector transitions. As a result, it is shown that the longitudinal form factor for a particular multipolarity cannot be explicitly factorized into a product of a function of momentum transfer and a function of excitation energy over the entire range of momentum transfer. Further, the ambiguity arising out of the use of the hydrodynamical model to assign spins of giant resonances is illustrated, taking the isovector electric dipole form factor as an example.


1987 ◽  
Vol 189 (3) ◽  
pp. 267-270 ◽  
Author(s):  
A.E.L. Dieperink ◽  
E. Moya De Guerra

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