Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-11-12
JHEP 0805:078,2008
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 1 figure, minor corrections, comments added, figure changed
Scientific paper
10.1088/1126-6708/2008/05/078
In this paper we show that it is possible to derive non-perturbative superpotential terms from a stringy instanton without introducing orientifold planes. The instanton is realized by a Euclidean D brane wrapping a non-trivial cycle upon which we also wrap a single space-filling D brane. The standard problem of unwanted neutral fermionic zero modes is evaded by the appearance of couplings to charged bosonic zero modes in the instanton moduli action. Since the Euclidean D brane wraps a cycle which is not associated to any low energy gauge dynamics, it can not be interpreted as an ordinary gauge instanton, but rather as a stringy one. By considering such a brane configuration at an orbifold singularity, we can explicitly evaluate the instanton moduli space integral and find a holomorphic superpotential term with the structure of a baryonic mass term.
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