# Classical ultrarelativistic bremsstrahlung in extra dimensions - High Energy Physics - Theory

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Abstract: The emitted energy and the cross-section of classical scalar bremsstrahlungin massive particle collisions in D=4+d dimensional Minkowski space M D as wellas in the brane world M 4 \times T^d is computed to leading ultra-relativisticorder. The particles are taken to interact in the first case via the exchangeof a bulk massless scalar field \Phi and in the second with an additionalmassless scalar \phi confined together with the particles on the brane. Energyis emitted as \Phi radiation in the bulk and-or \phi radiation on the brane. Incontrast to the quantum Born approximation, the classical result is unambiguousand valid in a kinematical region which is also specified. For D=4 the resultsare in agreement with corresponding expressions in classical electrodynamics.

Autor: D.V. Gal'tsov, G. Kofinas, P. Spirin, T.N. Tomaras

Fuente: https://arxiv.org/