Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-04-14
Eur.Phys.J.C71:1653,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Five pages, no figures.
Scientific paper
10.1140/epjc/s10052-011-1653-y
The experimental detection of the effects of noncommuting coordinates in electrodynamic phenomena depends on the magnitude of |\theta B|, where \theta is the noncommutativity parameter and B a background magnetic field. With the present upper bound on \theta, given by \theta_{\rm bound} \simeq 1/(10 {\rm TeV})^2, there was no large enough magnetic field in nature, including those observed in magnetars, that could give visible effects or, conversely, that could be used to further improve \theta_{\rm bound}. On the other hand, recently it has been proposed that intense enough magnetic fields should be produced at the beginning of relativistic heavy ion collisions. We discuss here lepton pair production by free photons as one kind of signature of noncommutativity and Lorentz violation that could occur at RHIC or LHC. This allows us to obtain a more stringent bound on \theta, given by 10^{-3} \theta_{\rm bound}, if such "exotic" events do not occur.
Castorina Paolo
Iorio Alfredo
Zappalà Dario
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