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---
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title: Higher dimensionsal terms in superpotential
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permalink: /Higher_dimensionsal_terms_in_superpotential/
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---
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[Category:Model](/Category:Model "wikilink")
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General
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-------
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SARAH is mainly restricted to renormalisable operators. The only exception are the possibility to include interactions of four superfields in the [Superpotential](/Superpotential "wikilink"):
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SuperPotential = ... + [Coefficient] EffOp [Contraction] SuperField1.SuperField2.SuperField3.SuperField4
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SARAH can't so far not include the entire impact of this operator but the following aspects are covered:
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- A soft-term involving four scalars is added (`Q[EffOp]`)
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- The [RGEs](/RGEs "wikilink") for the superpotential term and the soft-term are calculated
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- The four scalar and two scalar-two fermion interactions are added to the Lagrangian. However, for the FFSS interactions only those terms are included in the calculation where at least one scalar is replaced by a VEV, i.e. effective FFS and FF terms are generated.
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Example
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Despite the many limitations in the support of such terms, the given functionality is sufficient to include all important effects from the Weinberg operator. Adding the term
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SuperPotential = WOp/2 Hu.l.Hu.l
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to the superpotential, SARAH calculates the RGEs for `WOp` and uses it to obtain neutrino masses.
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See also
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-------- |
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