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---
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title: Special fields and parameters in SARAH
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permalink: /Special_fields_and_parameters_in_SARAH/
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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 treats some parameters or particles in a model in a specific way if they are associated with SM and MSSM parameters. In order to make this association, the `Description` statement in [particles.m](/particles.m "wikilink") and [parameters.m](/parameters.m "wikilink") is used.
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Usage of parameters
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-------------------
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SARAH makes use of the information that some particles/parameters correspond to specific SM or MSSM parameters/particles for the following purposes:
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- For particles:
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1. [FlavorKit](/FlavorKit "wikilink") generates the code to calculate flavour observables in the model by knowing what are the SM fermions are
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2. For SM fields the pole masses are used for the decays in [SPheno](/SPheno "wikilink")
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3. The [effective diphoton/digluon vertices](/Diphoton_and_digluon_vertices_with_SPheno "wikilink") for CP-even and CP-odd Higgs states are calculated by [SPheno](/SPheno "wikilink")
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4. ...
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- For parameters:
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1. The running of the strong coupling is included in the [CalcHep/CompHep](/CalcHep/CompHep "wikilink"), [WHIZARD](/WHIZARD "wikilink"), [UFO](/UFO "wikilink") output.
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2. Automatic matching of parameters in the model to measured SM values in [SPheno](/SPheno "wikilink")
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3. VEVs are related to tan *β* and *M*<sub>*Z*</sub> in [SPheno](/SPheno "wikilink")
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4. Giving the option to write the spectrum file of [SPheno](/SPheno "wikilink") in the SCKM basis
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5. ...
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List of keyword
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---------------
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### Particles
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The following keywords to assign particles are understood by SARAH:
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- `Leptons`
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- `Down-Quarks`
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- `Up-Quarks`
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- `Photon`
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- `Gluon`
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- `W-Boson`
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- `Z-Boson`
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- `Up-Squarks`
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- `Higgs`
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- `Pseudo-Scalar Higgs`
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- `Charged Higgs`
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- `Neutrinos`
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- `Sneutrinos`
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### Parameters
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The following keywords to assign parameters are understood by SARAH:
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- `Up-Yukawa-Coupling`
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- `Down-Yukawa-Coupling`
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- `Lepton-Yukawa-Coupling`
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- `Hypercharge-Coupling`
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- `Left-Coupling`
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- `Strong-Coupling`
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- `Up-Squark-Mixing-Matrix`
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- `Down-Squark-Mixing-Matrix`
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- `Left-Lepton-Mixing-Matrix`
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- `Right-Lepton-Mixing-Matrix`
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- `Left-Down-Mixing-Matrix`
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- `Right-Down-Mixing-Matrix`
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- `Left-Up-Mixing-Matrix`
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- `Right-Up-Mixing-Matrix`
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- `Weinberg-Angle`
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- `Down-VEV`
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- `Up-VEV`
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- `Scalar-Mixing-Matrix`
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- `Pseudo-Scalar-Mixing-Matrix`
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- `Softbreaking right Down-Squark Mass`
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- `Softbreaking right Up-Squark Mass`
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- `Softbreaking left Slepton Mass`
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- `Softbreaking right Slepton Mass`
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- `Softbreaking left Squark Mass`
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- `Trilinear-Up-Coupling`
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- `Trilinear-Down-Coupling`
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- `Trilinear-Lepton-Coupling`
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Examples
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--------
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1. **The SM parameters** are set in [parameters.m](/parameters.m "wikilink") via
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ParameterDefinitions = {
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{g1, { Description -> "Hypercharge-Coupling"}},
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{g2, { Description -> "Left-Coupling"}},
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{g3, { Description -> "Strong-Coupling"}},
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{Yu, { Description -> "Up-Yukawa-Coupling" }},
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{Yd, { Description -> "Down-Yukawa-Coupling"}},
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{Ye, { Description -> "Lepton-Yukawa-Coupling"}},
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...
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};
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2. **The SM particles** are set in [particles.m](/particles.m "wikilink") via
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ParticleDefinitions[EWSB] = {
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{hh , { Description -> "Higgs"}},
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{Ah , { Description -> "Pseudo-Scalar Higgs"}},
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{VP, { Description -> "Photon"}},
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{VZ, { Description -> "Z-Boson"}},
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{VG, { Description -> "Gluon" }},
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{VWm, { Description -> "W-Boson" }},
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{Fd, { Description -> "Down-Quarks"}},
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{Fu, { Description -> "Up-Quarks"}},
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{Fe, { Description -> "Leptons" }},
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{Fv, { Description -> "Neutrinos" }},
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...
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};
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See also
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-------- |
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\ No newline at end of file |