Search

We explore the dark matter and LHC implications of t − b − τ quasi Yukawa unification in the framework of supersymmetric models based on the gauge symmetry G = SU ( 4 ) c × SU ( 2 ) L × SU ( 2 ) R . The deviation from exact Yukawa unification is quantified by a dimensionless parameter C ( | C | ≲ 0.2 ), such that the Yukawa couplings at M GUT are related by y t : y b : y τ = | 1 + C | : | 1 − C | : | 1 + 3 C | . In contrast to earlier studies which focused on universal gaugino masses, we consider non-universal gaugino masses at M GUT that are compatible with the gauge symmetry G . Our results reveal a variety of neutralino dark matter scenarios consistent with the observations. These include stau and chargino coannihilation scenarios, the A -resonance scenario, as well as Higgsino dark matter solutions which are more readily probed by direct detection searches. The gluino mass is found to be ≲ 4 TeV , the stop mass is ≳ 2 TeV , while the first two family squarks and sleptons are of order 4–5 TeV and 3 TeV respectively. [ABSTRACT FROM AUTHOR]

Motivated by the recently reported measurement of the W boson mass M W = 80.4335 ± 0.0094 GeV by the CDF collaboration, we propose a type III seesaw extension of the minimal supersymmetric standard model (MSSM) which also includes an R-parity violating term. Without taking potential SUSY radiative corrections into account, we show that the CDF measurement of M W and the LEP measurement of the ρ parameter can be simultaneously accommodated at the 2 σ level. A long-lived gravitino in a few GeV mass range is a unique viable dark matter candidate in this framework. [ABSTRACT FROM AUTHOR]