HADRONIC FORM FACTORS IN THE γp→K+Λ PROCESS

2013 ◽  
Vol 28 (14) ◽  
pp. 1350054 ◽  
Author(s):  
T. MART ◽  
A. K. SARI
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Form Factors ◽  
Polarization Data ◽  
Gaussian Form ◽  
Isobaric Model ◽  
Double Polarization ◽  
Gaussian Form Factor ◽  
Photo Production ◽  
Dipole Form

We have investigated the effects of different hadronic form factors on the performance of an isobaric model developed for kaon photo-production off the proton. We found that there is no ideal form factor in this case. The dipole and generalized dipole form factors can help to nicely reproduce the differential cross-section and hyperon polarization data. However, in the case of double polarization data Cx and Cz the Gaussian form factor is found to be superior.

A combination of hadronic form factors for modeling the kaon photoproduction process γp → K+Λ

2015 ◽  
Vol 24 (02) ◽  
pp. 1550008 ◽  
Author(s):  
L. Syukurilla ◽  
T. Mart
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Differential Cross Section ◽  
Cross Section ◽  
Form Factors ◽  
Coupling Constants ◽  
Dipole Form Factor ◽  
Photoproduction Process ◽  
Different Types ◽  
Dipole Form

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.

The influence of the nuclear and atomic form factors on the muon bremsstrahlung cross section

1968 ◽  
Vol 46 (10) ◽  
pp. S377-S380 ◽  
Author(s):  
A. A. Petrukhin ◽  
V. V. Shestakov
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Born Approximation ◽  
Form Factors ◽  
Experimental Results ◽  
Simple Analytical Expression ◽  
Nuclear Form Factor ◽  
The Cross ◽  
Atomic Electrons ◽  
Bremsstrahlung Process

The cross section for the muon bremsstrahlung process is calculated as a function of the nuclear form factor in the Born approximation following the Bethe and Heitler theory. The influence of the nuclear form factor is greater than that taken by Christy and Kusaka. The simple analytical expression for the effect of the screening of the atomic electrons is found. The influence of a decrease in the cross section upon the interpretation of some experimental results is estimated.

scholarly journals Measurement of hadronic form factors at BESIII

2018 ◽  
Vol 172 ◽  
pp. 03002
Author(s):  
Haiming HU
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Center Of Mass ◽  
Polar Angle ◽  
Form Factors ◽  
Pion Form Factor ◽  
Angle Distribution ◽  
Data Set ◽  
Center Of Mass Energy ◽  
The Cross

The measurements of hadronic form factors of three modes using the data samples collected with the BESIII detector at BEPCII collider are presented. The cross section of e+e- → p p̅ at 12 energies from 2232.4 to 3671.0 MeV are measured, the electromagnetic form factor is deduced, and the ratio |GE/GM| is extracted by fitting the polar angle distribution. The preliminary results about the form factors of e+e- → ∧c+ ⊼c- will also be described. The cross section of e+e- → π+ π-between effective center-of-mass energy 600 and 900 MeV is measured by the ISR return method using the data set with the integrated luminosity of 2.93 fb-1 taken at ψ(3773) peak, the pion form factor is extracted.

scholarly journals Studying the Bound State of the BK¯ System in the Bethe-Salpeter Formalism

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Zhen-Yang Wang ◽  
Jing-Juan Qi ◽  
Xin-Heng Guo
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Bound State ◽  
Equation Approach ◽  
Dipole Form Factor ◽  
Instantaneous Approximation ◽  
Particle Exchange ◽  
Dipole Form

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.

scholarly journals Properties of the Inelastic Form Factors of the Nucleus

1978 ◽  
Vol 31 (1) ◽  
pp. 9 ◽  
Author(s):  
WK Koo ◽  
LJ Tassie
Keyword(s):  
Form Factor ◽  
Momentum Transfer ◽  
Inversion Formula ◽  
Sum Rules ◽  
Form Factors ◽  
Identity Operator ◽  
Weighted Sum ◽  
Giant Resonances ◽  
Dipole Form Factor ◽  
Dipole Form

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.

THE STRANGENESS CHANGING ANTINEUTRINO REACTION ${\bar\nu}_L+P\longrightarrow\Lambda+L^+$

2005 ◽  
Vol 20 (06) ◽  
pp. 1212-1220 ◽  
Author(s):  
S. L. MINTZ
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Cross Sections ◽  
Form Factors ◽  
Tau Lepton ◽  
Electric Form Factor ◽  
G Parity ◽  
The Cross ◽  
Pseudoscalar Form Factor ◽  
Near Threshold

We obtain the cross sections for the reactions [Formula: see text] where L is a massive lepton, i.e. a muon or a tau lepton. We do this from near threshold to relativistic energies. We further obtain the contributions of various form factors and interference terms to the cross section with a view to discovering if the contributions from hard to observe form factors such as the weak pseudoscalar form factor, FP, and the weak electric form factor, FE might be obtained via these reactions. The form factor FE is particularly interesting as in the more usually observed p↔n transition it is a second class current and forbidden by G-parity. However in the p↔Λ transition it is not forbidden and it would be desirable to learn if it is present. Finally we discuss our results and prospects for these experiments.

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