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The main contribution to the process e+e- --> gamma gamma comes from QED by means of an ordinary electron exchange at t- and u-channel. Because of the two photons in the final state the experimental signature of the process is clean, so the e+e- --> gamma gamma process is a very convenient tool to find some signals for physics beyond the SM. Any deviation from the QED predictions can be interpreted as a sign of new physics beyond the SM. In this work, we study the excited electron contribution to the e+e- --> gamma gamma pair annihilation process at future high energy linear colliders. Here we assume chiral magnetic couplings of spin-1/2 excited electrons to photons and ordinary electrons.
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References: Phys. Lett. B 531 28-38 (2002)
hep-ph/0103132v2 (2004)
Balkan Physics Letters, 18, 181030 (2010)
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