scholarly journals Charged pion form factor betweenQ2=0.60and 2.45GeV2. I. Measurements of the cross section for the1H(e,e'π+)nreaction

2008 ◽  
Vol 78 (4) ◽  
Author(s):  
H. P. Blok ◽  
T. Horn ◽  
G. M. Huber ◽  
E. J. Beise ◽  
D. Gaskell ◽  
...  
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Charged Pion ◽  
Pion Form Factor ◽  
The Cross

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.

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 Charged pion form factor betweenQ2=0.60and2.45 GeV2. II. Determination of, and results for, the pion form factor

2008 ◽  
Vol 78 (4) ◽  
Author(s):  
G. M. Huber ◽  
H. P. Blok ◽  
T. Horn ◽  
E. J. Beise ◽  
D. Gaskell ◽  
...  
Keyword(s):  
Form Factor ◽  
Charged Pion ◽  
Pion Form Factor

Effect of two-photon exchange on the charged pion form factor

2010 ◽  
Vol 684 (2-3) ◽  
pp. 123-126 ◽  
Author(s):  
Yu Bing Dong ◽  
S.D. Wang
Keyword(s):  
Form Factor ◽  
Charged Pion ◽  
Pion Form Factor ◽  
Photon Exchange ◽  
Two Photon

Gaussian deconvolution: a useful method for a form-free modeling of scattering data from mono- and multilayered planar systems

2012 ◽  
Vol 45 (6) ◽  
pp. 1278-1286 ◽  
Author(s):  
Cristiano L. P. Oliveira ◽  
Barbara B. Gerbelli ◽  
Emerson R. T. Silva ◽  
Frédéric Nallet ◽  
Laurence Navailles ◽  
...  
Keyword(s):  
Form Factor ◽  
Electron Density ◽  
Cross Section ◽  
Density Profile ◽  
Structure Factor ◽  
Electron Density Profile ◽  
Scattering Data ◽  
Planar Systems ◽  
The Cross ◽  
Section Structure

A new method for analysis of scattering data from lamellar bilayer systems is presented. The method employs a form-free description of the cross-section structure of the bilayer and the fit is performed directly to the scattering data, introducing also a structure factor when required. The cross-section structure (electron density profile in the case of X-ray scattering) is described by a set of Gaussian functions and the technique is termed Gaussian deconvolution. The coefficients of the Gaussians are optimized using a constrained least-squares routine that induces smoothness of the electron density profile. The optimization is coupled with the point-of-inflection method for determining the optimal weight of the smoothness. With the new approach, it is possible to optimize simultaneously the form factor, structure factor and several other parameters in the model. The applicability of this method is demonstrated by using it in a study of a multilamellar system composed of lecithin bilayers, where the form factor and structure factor are obtained simultaneously, and the obtained results provided new insight into this very well known system.

scholarly journals Identification of the e+e−→ nn̅ events in CMD-3 detector

2019 ◽  
Vol 212 ◽  
pp. 07006
Author(s):  
A.N. Amirkhanov ◽  
G.V. Fedotovich ◽  
S.S. Gribanov ◽  
I.B. Logashenko ◽  
A.S. Popov ◽  
...  
Keyword(s):  
Form Factor ◽  
Cross Section ◽  
Good Accuracy ◽  
The Cross ◽  
Background Events

A large amount of data collected with the CMD-3 detector above the threshold of the nn̅pair allows to measure the cross section of the process e+e−→ nn̅and the neutron form factor with good accuracy. This task is complicated by a large number of background events and necessity of finding ways to suppress them. A technique of identification for e+e−→ nn̅events is described.

Charged Pion Form Factor Determination in the Range of Q 2 = 0.6 ~ 1.6 (GeV/ c ) 2

2004 ◽  
Vol 42 (1) ◽  
pp. 83-86
Author(s):  
Nader Ghahramany ◽  
Kamran Rostami ◽  
Mohammad Ghanatian
Keyword(s):  
Form Factor ◽  
Charged Pion ◽  
Pion Form Factor

scholarly journals First measurement of the cross section for νμ and ν¯μ induced single charged pion production on argon using ArgoNeuT

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
R. Acciarri ◽  
C. Adams ◽  
J. Asaadi ◽  
B. Baller ◽  
T. Bolton ◽  
...  
Keyword(s):  
Cross Section ◽  
Pion Production ◽  
Charged Pion ◽  
The Cross

ρ-Dominance Electromagnetic Pion Form Factor with Vacuum-Polarization Insertions

1972 ◽  
Vol 50 (2) ◽  
pp. 119-121 ◽  
Author(s):  
R. A. Buchl ◽  
B. P. Nigam
Keyword(s):  
Form Factor ◽  
Vacuum Polarization ◽  
Charged Pion ◽  
Absorptive Part ◽  
Pion Form Factor ◽  
Polarization Tensor ◽  
Vacuum Polarization Tensor

The ρ-meson propagator is modified by insertions of the vacuum-polarization tensor due to charged pion pairs. The sum of all such contributing graphs via the Duffin–Kemmer formalism is seen to give a Breit–Wigner-type expression for the electromagnetic pion form factor. The width of the ρ meson is associated with the absorptive part of the pion form factor and at t = mρ2 we estimate fρππ2/4π = 2.5 using the experimental width Γρ = 125 ± 20 MeV.

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