Experimentally inspired parametrization ("effective")

  • σ(gg) ⋅ BR(WW)
  • σ(VBF) / σ(gg)
  • BR(γγ) / BR(WW)
  • BR(bb) / BR(WW)

  • σ(WH) / σ(VBF)
  • σ(WH) / σ(ZH)
  • BR(ZZ) / BR(WW)

  • BR(ττ) / BR(bb)

SM-inspired parametrization ("fundamental")

The exhaustive list of degrees of freedom (as far as I can tell) is:

  • gW, gZ, gb, and gτ
    • Closely related to the experimental outcome (in varying degrees).
    • gW and gZ are linked via SU(2).
    • gb and gτ are linked via fermion symmetries.

  • gtop
    • Not so closely related to the experimental outcome.

  • Total width
    • Likely only an upper limit if the width is the SM one.
    • Sets limits on invisible width if we assume g_charm.

  • gcharm
    • Undetected; requires an assumption in every case.
    • Linked with other fermions
    • When gb and gτ are released, lump it up with an invisible/undetectable width?

  • BSM "plugins"
    • allowance for new particles in the gluon/gamma loops (2 parameters)
    • allowance for invisible width (1 parameter) (but 100% anti-correlated with gcharm assumption)
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Topic revision: r1 - 2012-04-12 - AndreDavid
 
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