FCNC Processes from D-brane Instantons

Understand

Low string scale models might be tested at the LHC directly by their Regge resonances.

• For such models it is important to investigate the constraints of Standard Model precision measurements on the string scale.
• It is shown that highly suppressed FCNC processes like K0- bar K^0 oscillations or leptonic decays of the D0-meson provide non-negligible lower bounds on both the perturbatively and surprisingly also non-perturbatively induced string theory couplings.
• We present both the D-brane instanton formalism to compute such amplitudes and discuss various possible scenarios and their constraints on the string scale for (softly broken) supersymmetric intersecting D-brane models.