THE CHOU-YANG MODEL AND ≡−p → ≡−p AT HIGH ENERGIES

1987 ◽  
Vol 02 (01) ◽  
pp. 217-222 ◽  
Author(s):  
MUJAHID KAMRAN ◽  
I. B. QURESHI
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Electric Form Factor ◽  
High Energies ◽  
Elastic Data ◽  
Good Agreement

The Chou-Yang model is applied to the ≡−p elastic data from the SPS hyperon beam experiments under the assumption that hyperons have approximately equal form factors. Three different expressions for the proton electric form factor are used. All cases yield similar results in good agreement with experiment. The model predicts a dip in dσ/dt around −t ≃ 1 (GeV/c) 2 at present energies.

THE CHOU-YANG MODEL AND ELASTIC πp SCATTERING AT HIGH ENERGIES

1987 ◽  
Vol 02 (06) ◽  
pp. 1871-1886
Author(s):  
MUJAHID KAMRAN ◽  
I.E. QURESHI
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Proton Form Factor ◽  
Electromagnetic Form Factors ◽  
Matter Distribution ◽  
High Energies ◽  
Proton Form ◽  
200 Gev ◽  
Elastic Data

By considering 14 different pion and proton form-factor combinations it is shown that the Chou-Yang model is not successful in describing πp elastic data at 200 GeV/c. It is further shown that a modified version in which the proton matter distribution is different from its electromagnetic form factors is able to describe the data well. Aspects of amplitude structure are also discussed.

scholarly journals Form-faсtor of the holograms of composite images

2018 ◽  
Vol 42 (3) ◽  
pp. 362-368 ◽  
Author(s):  
S. A. Shoydin ◽  
A. V. Trifanov
Keyword(s):  
Form Factor ◽  
Diffraction Efficiency ◽  
Form Factors ◽  
Brightness Distribution ◽  
Gaussian Beams ◽  
Optimal Parameters ◽  
Main Attention ◽  
Gaussian Distributions ◽  
Non Gaussian ◽  
Good Agreement

This article is a follow-on study of the influence of the form-factor of holograms on their optimal characteristics, such as the optimal exposure, subject to a known visibility distribution, and the maximum achievable values of the average diffraction efficiency in a hologram. The main attention is paid to the verification of the applicability of the form-factor concept to calculating the optimal parameters of a phase hologram. The results obtained suggest that the technique of calculation and practical use of the form-factor is suitable for holograms of real images formed by complex beams. Using 30-plus real images, the approach to determining the form factor for visual holograms is analyzed. A fairly good agreement between the form factors of the holograms of real portrait images and those of Gaussian beams has been found. The real images have been shown to have near-Gaussian brightness distribution statistics. Note that for non-Gaussian distributions, the proposed method of calculating and using the form-factor is also suitable.

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.

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.

Helm model interpretation of 16O form factors: application to pion photoproduction and muon capture

1980 ◽  
Vol 58 (1) ◽  
pp. 48-62 ◽  
Author(s):  
R. D. Graves ◽  
B. A. Lamers ◽  
Anton Nagl ◽  
H. Überall ◽  
V. Devanathan ◽  
...  
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Form Factors ◽  
Muon Capture ◽  
Physical Parameters ◽  
Medium Energy ◽  
Model Interpretation ◽  
Charged Pions ◽  
Transition Densities ◽  
Energy Processes

The available experimental data for the form factors of the T = 1 levels in 16O, obtained from electron scattering at low (Darmstadt), medium (Tohoku), and high momentum transfer (Stanford), are interpreted by the generalized Helm model. This phenomenological model reduces the form factor description of each level to the listing of a few physical parameters, i.e., the radius and smearing width of the transition densities of charge (current) and magnetization, and their corresponding strength constants. Its parameters having been determined by the form factor fits, the model may then be used to predict the results of other medium energy processes; this is done here for the photoproduction of charged pions and for muon capture in16O.

scholarly journals Variation in rms charge radii of deuteron and helium nuclei with s\sqrt s

Nukleonika ◽  
2020 ◽  
Vol 65 (4) ◽  
pp. 211-215
Author(s):  
Sarwat Zahra ◽  
Bushra Shafaq ◽  
Bushra Kanwal ◽  
Nosheen Akbar
Keyword(s):  
Center Of Mass ◽  
Form Factors ◽  
Mass Energy ◽  
Charge Radii ◽  
Center Of Mass Energy ◽  
Theoretical Predictions ◽  
Dependent Form ◽  
Energy Dependent ◽  
The Relationship ◽  
Good Agreement

AbstractBy considering energy-dependent form factors extracted from generalized Chou–Yang model, root mean square (rms) charge radii of deuteron and helium nuclei (alpha) are predicted at different values of center of mass energy which are in good agreement with theoretical predictions and experimental results. The rms radius is inversely proportional to mass of nuclei. Besides, the relationship between radii and energy are also derived.

scholarly journals The Nuclear Structure for Exotic Neutron-Rich of 42, 43, 45,47K Nuclei

2016 ◽  
Vol 13 (1) ◽  
pp. 146-154
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Dipole ◽  
Electron Scattering ◽  
Dipole Moments ◽  
Exotic Nucleus ◽  
Form Factors ◽  
Model Space ◽  
Density Distributions ◽  
Plane Wave Born Approximation ◽  
Magnetic Electron ◽  
Good Agreement

In this paper the proton, neutron and matter density distributions and the corresponding root mean square (rms) radii of the ground states and the elastic magnetic electron scattering form factors and the magnetic dipole moments have been calculated for exotic nucleus of potassium isotopes K (A= 42, 43, 45, 47) based on the shell model using effective W0 interaction. The single-particle wave functions of harmonic-oscillator (HO) potential are used with the oscillator parameters b. According to this interaction, the valence nucleons are asummed to move in the d3f7 model space. The elastic magnetic electron scattering of the exotic nuclei 42K (J?T= 2- 2), 43K(J?T=3/2+ 5/2), 45K (J?T= 3/2+ 7/2) and 47K (J?T= 1/2+ 9/2) investigated through Plane Wave Born Approximation (PWBA). The inclusion of core polarization effect through the effective g-factors is adequate to obtain a good agreement between the predicted and the measured magnetic dipole moments.

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