Derivative F-Terms from Heterotic M-Theory Five-brane Instantons
arXiv:hep-th/0611119 · doi:10.1016/j.physletb.2006.12.039
Abstract
We study non-perturbative effects due to a heterotic M-theory five-brane wrapped on Calabi-Yau threefold. We show that such instantons contribute to derivative F-terms described recently by Beasley and Witten rather than to the superpotential.
10 pages, Latex, minor corrections