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Effect of differential cross section in Breit-Wheeler pair beaming

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Academic year: 2021

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Figure 2. Pair energy distribution for E γ 1 = E γ 2 = 4 MeV and θ p = 40 ◦ . (a) For isotropic (b) for BW differential cross section.
Figure 3. Electron-positron pair production from a pair of photons represented to the first order by Feynman diagrams, corresponding to the BW process: γ + γ → e + + e − .
Figure 4. (a) BW differential cross section dσ/dxdφ (in units of r 2 e ) blue and red arrows give the photon direction and black arrow the CM frame velocity direction for photon beams with equal energy of 4 MeV and θ p = 40 ◦
Figure 5. Pair emission in the laboratory frame for E γ 1 = E γ 2 = 4 MeV and θ p = 40 ◦ with anisotropic differential cross section
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