A scenario for stabilization of axionic moduli fields in the context of type IIB Calabi-Yau flux compactifications is discussed in detail. We consider the case of a Calabi-Yau orientifold with h 1,1 − = 0 which allows for the presence of B 2 and C 2 -moduli. In an attempt to generalize the KKLT and the Large Volume Scenario, we show that these axions can also be stabilized -some already at tree level, and others when we include perturbative α ′ -corrections to the Kähler potential K and nonperturbative D3-instanton contributions to the superpotential W . At last, we comment on the possible influence of worldsheet instantons on the process of moduli stabilization.
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