Improved Z -> gamma gamma decay in the renormalizable gauge sector of   the noncommutative standard model
  In this work we propose the Z -> gamma gamma decay as a process strictly forbidden in the standard model, suitable for the search of noncommutativity of coordinates at very short distances. We computed the Z -> gamma gamma partial width in the framework of the recently proposed one-loop renormalizable gauge sector of the noncommutative standard model. New experimental possibilities at LHC are analyzed and a firm bound to the scale of noncommutativity parameter is set around 1 TeV. 
M. Buric, D. Latas, V. Radovanovic, J. Trampetic