An Exponentially Small μμ--term in String Theory

preprint2009arXivOpen access

Abstract

We describe a mechanism that produces an exponentially small μμ--term on the world--volumes of D5 branes wrapping a deformed and fibered A3A_3 singularity. The small μμ arises due to brane instanton effects which can be calculated after a geometric transition at one of the nodes of the singularity.

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