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---
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title: Dirac Spinors
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permalink: /Dirac_Spinors/
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---
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[Category:Model](/Category:Model "wikilink") Event generators and programs for calculating Feynman Diagrams are normally written for Dirac spinors, but SARAH does all internal calculations for Weyl spinors. Therefore, it is necessary to define, how the Weyl spinors combine to Dirac spinors. That can be done for each all eigenstates separately
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DEFINITION[$EIGENSTATES][DiracSpinors]={
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Dirac Spinor -> {Weyl 1, Weyl 2},
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...
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}
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`Dirac Spinor` is the new name of the Dirac spinor, while `Weyl 1` and `Weyl 2` the names of the Weyl spinors building the left respectively right component of the Dirac spinor.
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##### Example
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The electron `Fe` is built from the components `FeL` and `FeR` by
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DEFINITION[EWSB][DiracSpinors]={
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Fe -> {FeL, FeR},
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...
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}
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while the neutralinos `Chi`, which are Majorana particles, consists only of the Weyl spinor `L0`
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Chi -> {L0, conj[L0]}
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See also
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-------- |
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