scholarly journals High-Energyγ-Ray Source from Electron-Positron Pair Annihilation

1965 ◽  
Vol 137 (3B) ◽  
pp. B730-B739 ◽  
Author(s):  
Yung-Su Tsai
Keyword(s):  
Electron Positron ◽  
Pair Annihilation ◽  
Electron Positron Pair

The Conservation of Energy and Momentum in the Positron-Electron Annihilation According to Complete Relativity

2014 ◽  
Vol 5 (3) ◽  
pp. 854-858
Author(s):  
Giuseppe Bellotti
Keyword(s):  
Three Dimensional ◽  
Standing Waves ◽  
Energy Conditions ◽  
Conservation Of Energy ◽  
Electron Positron ◽  
Pair Annihilation ◽  
Conservation Of Momentum ◽  
Energy And Momentum ◽  
The Right ◽  
Electron Positron Pair

According to Complete Relativity (an improvement of Special Relativity where a new postulate was introduced: an electron cannot move at average speeds less than  u0 = αc / π  where  α  is the constant of fine structure and  c  is the speed of light), and with the hypothesis that the electron and positron are two three-dimensional electromagnetic spherical standing waves, the electromagnetic standing waves of an electron-positron pair can overlap in the low energy conditions and generate a single  γ ray  of  E = 1.022  MeV.  Instead the actual physical theories consider a model of positron-electron pair annihilation, where conservation of momentum requires the creation of two 511 keV photons moving toward opposite directions. But in the paper we do not consider any photons: there is only a progressive electromagnetic wave compound by two electromagnetic standing waves. Only a thorough test will be able to decide the right model.

scholarly journals New physics searches at the ILC positron and electron beam dumps

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Kento Asai ◽  
Sho Iwamoto ◽  
Yasuhito Sakaki ◽  
Daiki Ueda
Keyword(s):  
Positron Beam ◽  
New Physics ◽  
Beam Dump ◽  
Dark Photon ◽  
Electron Positron ◽  
Pair Annihilation ◽  
Light Scalar ◽  
Production Mechanisms ◽  
Electron Positron Pair ◽  
Higher Sensitivity

Abstract We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are considered as new physics scenarios, where all the important production mechanisms are included: electron-positron pair-annihilation, Primakoff process, and bremsstrahlung productions.We find that the ILC beam dump experiment has higher sensitivity than past beam dump experiments, with the positron beam dump having slightly better performance for new physics particles which are produced by the electron-positron pair-annihilation.

scholarly journals Compton Scattering, Pair Annihilation, and Pair Production in a Plasma

2000 ◽  
Vol 195 ◽  
pp. 359-366
Author(s):  
V. Krishan
Keyword(s):  
Compton Scattering ◽  
Cross Sections ◽  
High Plasma ◽  
Electron Positron ◽  
Pair Annihilation ◽  
The Cross ◽  
Unmagnetized Plasma ◽  
Electron Photon ◽  
Electron Positron Pair ◽  
Photon Coupling

The square of the four-momentum of a photon in vacuum is zero. However, in an unmagnetized plasma, it is equal to the square of the plasma frequency. Further, the electron-photon coupling vertex is modified in a plasma to include the effect of the plasma medium. I calculate the cross sections of three processes in a plasma—Compton scattering and electron-positron pair annihilation and production. At high plasma densities, the cross sections are found to change significantly. Such high plasma densities exist in several astrophysical sources.

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