Moduli Dependent μ-Terms in a Heterotic Standard Model

In this paper, we present a formalism for computing the non-vanishing Higgs μterms in a heterotic standard model. This is accomplished by calculating the cubic product of the cohomology groups associated with the vector bundle moduli (φ), Higgs (H) and Higgs conjugate (H̄) superfields. This leads to terms proportional to φHH̄ in the low energy superpotential which, for non-zero moduli expectation values, generate moduli dependent μ-terms of the form 〈φ〉HH̄. It is found that these interactions are subject to two very restrictive selection rules, each arising from a Leray spectral sequence, which greatly reduce the number of moduli that can couple to Higgs–Higgs conjugate fields. We apply our formalism to a specific heterotic standard model vacuum. The non-vanishing cubic interactions φHH̄ are explicitly computed in this context and shown to contain only four of the nineteen vector bundle moduli. ∗vbraun, yanghe, [email protected]; [email protected]