scholarly journals The Effect of Unparticle in the Processes \(e^{+}e^{-}\rightarrow \gamma \gamma\) and \(\gamma e^{-}\rightarrow U^{\mu }e^{-}\) when the \(e^{+},e^{-}\) Beams Are Polarized in Unparticle Physics

2021 ◽  
Vol 31 (4) ◽  
Author(s):  
Dao Thi Le Thuy ◽  
Le Nhu Thuc
Keyword(s):  
Differential Cross Section ◽  
Energy Distribution ◽  
Cross Section ◽  
Differential Cross ◽  
Electron Exchange ◽  
Missing Energy ◽  
Scattering Angle ◽  
The Cross

We investigate the influence of unparticle physics on the positron-electron  collider via the scalar unparticle  and electron  exchange. From computing the contribution of the unparticle exchange to the cross-section (CS) as well as evaluating the dependence of differential cross-section (DCS) on the scattering angle , we calculate the production of vector unparticle in the photon-electron  collider in s- and t- channels such as missing energy distribution. Besides, we also found that the polarization of the beams also significantly contributes to the CS and DCS of the unparticle production.

scholarly journals Evaluation of the Compton (Incoherent) and Rayleigh (Coherent) Differential Cross Sections of Scattering for Rhodium 103Rh45 and Tantalum181Ta73 by Employing CSC model

2012 ◽  
Vol 9 (3) ◽  
pp. 554-558 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Form Factors ◽  
Differential Cross Sections ◽  
The Cross

The differential cross section for the Rhodium and Tantalum has been calculated by using the Cross Section Calculations (CSC) in range of energy(1keV-1MeV) . This calculations based on the programming of the Klein-Nashina and Rayleigh Equations. Atomic form factors as well as the coherent functions in Fortran90 language Machine proved very fast an accurate results and the possibility of application of such model to obtain the total coefficient for any elements or compounds.

scholarly journals Wγ AND Zγ PRODUCTION AND LIMITS ON ANOMALOUS WWγ, ZZγ AND Zγγ COUPLINGS WITH D0 DETECTOR

2012 ◽  
Vol 27 (14) ◽  
pp. 1230014
Author(s):  
XUEBING BU
Keyword(s):  
Transverse Momentum ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Final States ◽  
The Cross ◽  
The Difference ◽  
Charged Leptons ◽  
D0 Detector

The recent D0 results on Wγ and Zγ production are presented. First, the cross-section and the difference in rapidities between photons and charged leptons for inclusive W(→lν)+γ production in eγ and μγ final states are discussed, then are the cross-section and differential cross-section as a function of photon transverse momentum for Zγ→l+l-(l = e, μ) process. Finally, I present the limits on anomalous WWγ, ZZγ and Zγγ couplings.

scholarly journals Study of deuteron-proton backward elastic scattering at intermediate energies

2020 ◽  
Author(s):  
Nadezhda Ladygina
Keyword(s):  
Elastic Scattering ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Reaction Mechanisms ◽  
Single Scattering ◽  
Scattering Angle ◽  
Intermediate Energies ◽  
Proton Elastic Scattering ◽  
Reaction Amplitude

We study deuteron- proton elastic scattering in the deuteron energy range between 500 MeV and 2 GeV at the cms scattering angle \theta^*\ge 140^\circθ*≥140∘. The reaction is considered in the relativistic multiple scattering expansion framework. The four reaction mechanisms are included into consideration: one-nucleon exchange, single scattering, double scattering, and the term corresponding to the delta excitation in the intermediate state.The model is applied to describe the angular dependence of the differential cross section at the deuteron energies of between 880 and 1300 MeV. Also the energy dependence of the differential cross section and polarisation observables such as tensor analyzing power T_{20}T20 and polarization transfer from the deuteron to proton \varkappa𝜘 are considered at the scattering angle equal to 180^\circ∘. Contributions of the different reaction mechanisms into the reaction amplitude are demonstrated in comparison with the existing experimental data.

The reaction 15N(e, t0) between 20 and 25 MeV

1979 ◽  
Vol 57 (7) ◽  
pp. 1059-1062 ◽  
Author(s):  
J. Uegaki ◽  
J. Asai ◽  
M. K. Leung ◽  
J. J. Murphy II ◽  
Y. M. Shin ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Virtual Photon ◽  
Separation Energy ◽  
Excitation Energies ◽  
Data Comparison ◽  
Lower Excitation ◽  
The Cross

The differential cross section for the reaction 15N(γ, t0) at θlab = 90° has been obtained for excitation energies between 20 and 25 MeV by the measurement of a triton energy spectrum from the reaction 15N(e, t0)e′12C. A virtual photon analysis was used to extract the photodisintegration cross section from the electrodisintegration data. Comparison of this cross section to the cross section at lower excitation energies shows that the 15N(γ, t0) strength is concentrated in the region between 16 and 21 MeV. Comparison of the (γ, t0) cross section with those of other photodisintegration channels suggests an isospin separation energy of 6 MeV.

Second Born approximation to the Bremsstrahlung differential cross-section

1959 ◽  
Vol 253 (1272) ◽  
pp. 103-120 ◽  
Keyword(s):  
Differential Cross Section ◽  
Pair Production ◽  
Cross Section ◽  
Coulomb Potential ◽  
Differential Cross ◽  
Born Approximation ◽  
Yukawa Potential ◽  
Final States ◽  
The Cross ◽  
Cross Section Differential

In this paper we calculate the second Born approximation contribution to the Bremsstrahlung cross-section differential in both the photon and electron angles. This is divergent if a Coulomb potential is considered, but it is found, on following the idea of Dalitz (1951), that all observable quantities turn out to be finite when we perform the calculation for a Yukawa potential and take the limit of zero screening. It is shown that this is true to order Z 3 in the differential cross-section before it is averaged over spins, and the cross-section is calculated explicitly for the case of an unpolarized beam when the final states of polarization are not observed. Further, it is pointed out that the same methods can be applied satisfactorily in the case of pair production.

The Neutrino Reaction in 3H

1998 ◽  
Vol 07 (02) ◽  
pp. 275-285
Author(s):  
S. L. Mintz ◽  
G. M. Gerstner ◽  
M. A. Barnett ◽  
M. Pourkaviani
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Form Factors ◽  
Individual Form ◽  
Neutrino Reaction ◽  
The Cross ◽  
The Individual ◽  
Sharp Minima

We calculate the cross sections for the reactions, νe+3 H → e-+3 He , and νμ+3 H → μ-+3 He from threshold to 1 GeV. We obtain typical contributions of the individual form factors as well as the interference terms to the cross sections. We find that the cross sections for these processes are extremely large for a number of reasons, making them worthy of consideration for possible experiments. We also obtain a typical differential cross section and note the presence of sharp minima for high neutrino energies.

Regge Pole Plus Background Model of Backward πp Scattering

1974 ◽  
Vol 52 (13) ◽  
pp. 1155-1159
Author(s):  
S. Kogitz ◽  
R. K. Logan
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Charge Exchange ◽  
Differential Cross ◽  
Regge Pole ◽  
Background Model ◽  
Cross Section Data ◽  
Section Data ◽  
The Cross ◽  
Exchange Scattering

We present a model of backward π+p, π−p, and π−p charge exchange scattering consistent with our earlier approach to forward π−p charge exchange and backward π+p. We consider two body differential cross section data which exhibits a dip–bump structure as well as nonzero polarization. This is explained in terms of a dominant Regge pole vanishing at the dip accompanied by a background. The background is primarily responsible for the large u behavior of the cross section which includes the rise after the dip. It is assumed that the presence of nonzero polarization dictates this behavior. We isolate the I = 3/2 amplitude in π−p backwards and determine the I = 1/2 amplitude from π+p backwards. A prediction for π−p → nπ0 follows.

Elastic Photon Scattering Cross Section for the H− Ion in the Asymptotic Approximation

1975 ◽  
Vol 53 (22) ◽  
pp. 2502-2505
Author(s):  
Frederick W. King
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Asymptotic Approximation ◽  
Scattering Cross Section ◽  
Photon Scattering ◽  
Scattering Cross ◽  
The Cross ◽  
Dipole Length

A comparison is made between the calculation of the elastic photon scattering differential cross section for the H− ion in the asymptotic approximation, employing both the dipole length and dipole velocity formulations. The divergence of the cross section using the dipole velocity formulation is discussed.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

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