Two photons flying in opposite directions collide Let E 1 and E 2 be their energies (1) Find the minimum value of E 1 to allow the process 1 2 e e to occur if E 2 10 eV (2) Answer the same question if E 1 2E 2 (3) Find the centre of mass speed in the latter case (4) Draw the lowest order Feynman di...

1 The required energy for an electron and a positron ...

Two photons flying in opposite directions collide. Let E 1 and E 2 be their energies. (1)

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Two photons flying in opposite directions collide. Let E₁ and E₂ be their energies.

(1) Find the minimum value of E₁ to allow the process γ₁ + γ₂ → e⁺ + e^- to occur if E₂ = 10 eV.

(2) Answer the same question if E₁ = 2E₂.

(3) Find the centre of mass speed in the latter case.

(4) Draw the lowest-order Feynman diagram of the process.

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Introduction to Elementary Particle Physics

ISBN: 978-1107050402

2nd edition

Authors: Alessandro Bettini

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Question Posted: Mar 12, 2020 12:43 PM

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Two photons flying in opposite directions collide. Let E 1 and E 2 be their energies. (1)

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