Signals for Non-Commutative QED in $e γ$ and $γγ$ Collisions

Details Signals for Non-Commutative QED in $e γ$ and $γγ$ Collisions Signals for Non-Commutative QED in $e γ$ and $γγ$ Collisions

2001-11-12

arxiv.org/abs/hep-ph/0111147v1

eConf C010630 (2001) P313

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures, RevTeX 4.0, contributed to APS/DPF/DPB Summer Study on the Future of Particle Physics (Snowmass 2001), Sno

Scientific paper

We study the effects of non-commutative QED (NCQED) in fermion pair production, $\gamma + \gamma \to f + \bar{f}$ and Compton scattering, $e + \gamma \to e + \gamma$. Non-commutative geometries appear naturally in the context of string/M-theory and gives rise to 3- and 4-point photon vertices and to momentum dependent phase factors in QED vertices which will have observable effects in high energy collisions. We consider $e^+ e^-$ colliders with energies appropriate to the TeV Linear Collider proposals and the multi-TeV CLIC project operating in $\gamma \gamma$ and $e\gamma$ modes. Non-commutative scales roughly equal to the center of mass energy of the $e^+e^-$ collider can be probed, with the exact value depending on the model parameters and experimental factors. However, we found that the Compton process is sensitive to $\Lambda_{NC}$ values roughly twice as large as those accessible to the pair production process.

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