Classical ultrarelativistic bremsstrahlung in extra dimensions

Details Classical ultrarelativistic bremsstrahlung in extra dimensions Classical ultrarelativistic bremsstrahlung in extra dimensions

2010-03-15

arxiv.org/abs/1003.2982v2

JHEP 1005:055,2010

Physics

High Energy Physics

High Energy Physics - Theory

Preprint number added

Scientific paper

10.1007/JHEP05(2010)055

The emitted energy and the cross-section of classical scalar bremsstrahlung in massive particle collisions in D=4+d dimensional Minkowski space M_D as well as in the brane world M_4 \times T^d is computed to leading ultra-relativistic order. The particles are taken to interact in the first case via the exchange of a bulk massless scalar field \Phi and in the second with an additional massless scalar \phi confined together with the particles on the brane. Energy is emitted as \Phi radiation in the bulk and/or \phi radiation on the brane. In contrast to the quantum Born approximation, the classical result is unambiguous and valid in a kinematical region which is also specified. For D=4 the results are in agreement with corresponding expressions in classical electrodynamics.

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