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Sparticle mass spectra from SU(5) SUSY GUT models with $b- au$ Yukawa coupling unification | | Howard Baer
; Ilia Gogoladze
; Azar Mustafayev
; Shabbar Raza
; Qaisar Shafi
; | | Date: |
21 Jan 2012 | | Abstract: | Supersymmetric grand unified models based on the gauge group SU(5) often
require in addition to gauge coupling unification, the unification of b-quark
and $ au$-lepton Yukawa couplings. We examine SU(5) SUSY GUT parameter space
under the condition of $b- au$ Yukawa coupling unification using 2-loop MSSM
RGEs including full 1-loop threshold effects. The Yukawa-unified solutions
break down into two classes. Solutions with low taneta ~3-11 are
characterized by gluino mass ~1-4 TeV and squark mass ~1-5 TeV. Many of these
solutions would be beyond LHC reach, although they contain a light Higgs scalar
with mass <123 GeV and so may be excluded should the LHC Higgs hint persist.
The second class of solutions occurs at large taneta ~35-60, and are a subset
of $t-b- au$ unified solutions. Constraining only $b- au$ unification to ~5%
favors a rather light gluino with mass ~0.5-2 TeV, which should ultimately be
accessible to LHC searches. While our $b- au$ unified solutions can be
consistent with a picture of neutralino-only cold dark matter, invoking
additional moduli or Peccei-Quinn superfields can allow for all of our
Yukawa-unified solutions to be consistent with the measured dark matter
abundance. | | Source: | arXiv, 1201.4412 | | Services: | Forum | Review | PDF | Favorites | |
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