Conveners
SUSY Models
- Andrew Fowlie (Monash University)
SUSY Models
- Csaba Balazs (Monash University)
SUSY Models
- Sujeet Akula (Monash University)
SUSY Models
- Howard Baer (University of Oklahoma)
SUSY Models
- Peter Athron
Using a global Bayesian analysis, it is shown how the results
from searches for supersymmetry performed by CMS constrain
the Minimal Supersymmetric Standard Model (MSSM). The
study is performed within the framework of the
phenomenological MSSM (pMSSM), a 19-parameter realization
of the R-parity conserving weakscale MSSM, that captures
most of the latter’s phenomenological features and...
The two additional singlet-like Higgs bosons, one scalar and one pseudoscalar, of the next-to-minimal supersymmetric standard model (NMSSM) can result in some unique signatures at the Large Hadron Collider (LHC), helping establish the non-minimal nature of supersymmetry. In particular, there exists the possibility of one, or even both, of these new Higgs bosons being almost degenerate with the...
Indications from ATLAS and CMS of a potential new resonance at 750 GeV have seen a wide range of models put forward to explain the excess. Obtaining precise theoretical predictions for a given model can be a formidable computational challenge. On the other hand, relying on simpler analytical approximations often leads to important subtleties being neglected or missed. Here we describe...
Motivated by the naturalness and neutrino mass generation, we study a bilinear R-parity violating supersymmetric scenario with a light Higgsino-like lightest supersymmetric particle (LSP). We observe that the LSP dominantly decays to $\nu h$ in a large part of the parameter space, and thus study the pair production of electroweakinos followed by the decays $\tilde\chi^\pm_1\to \tilde\chi^0_1...
New and updated SUSY fits, using the MasterCode framework, are presented. In particular, results for new GUT based models are discussed.
The stability of the standard electroweak vacuum imposes constraints on flavor violating tri-linear soft terms which are comparable to the experimental bounds coming from the absence of the flavor changing neutral currents. Furthermore, contrary to the bounds coming from flavor changing neutral currents, the vacuum stability constraints do not decouple even if the scale of supersymmetry...
$E_6$ inspired SUSY models are a well-motivated class of models that can solve the $\mu$ problem in the MSSM and allow for the tree-level Higgs mass to be increased. In the simplest variants of these models, multiple exact and approximate discrete symmetries must be introduced for the model to be phenomenologically viable. Here we study a constrained version of a recently proposed $E_6$...
In this talk we propose a new supersymmetric model based on the trinification gauge group with global SU(3) flavour symmetry. We aim at solving the major issues of conventional trinification GUTs, such us multi-TeV SM fermion masses, as well as providing a natural way to introduce a SU(2)_L x SU(2)_R symmetry. We investigate whether it is possible to spontaneously break the original gauge...
We will discuss the low energy predictions arising from a GUT scale Pati-Salam gauge group with an A4 × Z5 family symmetry. This results in four soft scalar masses at the GUT scale: one left-handed soft mass and three right-handed soft masses, one for each generation. We will show that this model can correctly describe measurements of the anomalous magnetic moment of the muon, which currently...
I discuss electroweak symmetry breaking in SUSY models with extra vectorlike fields and show that under certain simple assumptions a 125 GeV Higgs can be achieved in a natural way. Implications for the properties of the Higgs boson and other collider phenomenology are also discussed.
Supersymmetric models with Dirac masses for the gauginos have both a
solid top-down theoretical motivation and a rich phenomenology. We show
that the 750 GeV di-photon excess can be explained by the Minimal Dirac
Gaugino Supersymmetric Standard Model without introducing any additional
"ad-hoc" states. In this model, the resonance is identified with the
scalar partner of the Dirac bino. We...
The 750-760 GeV diphoton resonance may be identified as one or two scalars and/or
one or two pseudoscalars contained in the two singlet superfields $S_{1,2}$
arising from the three 27-dimensional representations of $E_6$. We study the corresponding collider signature within the exceptional supersymmetric standard model (E$_6$SSM). This model is based on the SM gauge group together with an...
We investigate exclusion limits on the the non-universal gaugino mass scenario
in the Minimal Supersymmetric Standard Model (MSSM), according the the latest results of the super-particle search at the LHC8 and the LHC13. In this scenario, suitable ratios of wino to gluino mass can realize the observed value of the Higgs boson mass, while keeping a small $\mu$ parameter.
Such a small $\mu$...
The next-to-minimal supersymmetric standard model (NMSSM)
with an extended Higgs sector offers at least one Higgs boson as the
Standard model (SM) like Higgs with a mass around 125 GeV.
We revisit the mass spectrum and couplings of non-SM-like
Higgs bosons taking into consideration most relevant constraints.
We evaluate the rates of productions of these non-SM-like Higgs bosons at the LHC for...
We propose an NMSSM scenario that can explain the excess in the diphoton spectrum at 750 GeV recently observed by ATLAS and CMS. We show that in a certain limit with a very light pseudoscalar one can reproduce the experimental results without invoking exotic matter. The 750 GeV excess is produced by two resonant heavy Higgs bosons with masses ~750 GeV, that subsequently decay to two light...
We present predictions for SUSY Dark Matter searches and analyses based on the MasterCode framework.
The accurate measurements of the neutrino oscillation parameters including a CP phase are
one of the important issues to understand the fermion mass hierarchy in unification picture.
It is expected that all the elements in the neutrino mass matrix can be obtained (up to Majorana phases)
after the accurate measurements.
Before the measurements of 13-mixing and the CP phase, it was not...
We study the Yukawa unification, in particular, the unification of the Yukawa coupling constants of $b$ and $\tau$, in the framework of supersymmetric (SUSY) model. We concentrate on the model in which the SUSY breaking scalar masses are of the order of the gravitino mass while the gaugino masses originate from the effect of anomaly mediation and hence are one-loop suppressed relative to the...
The discovery of a 125 GeV Higgs-like boson and null results in searches for new physics at the LHC have lead to renewed interest in next-to-minimal supersymmetric models and doubts about traditional measures of fine-tuning in supersymmetric models. We investigate fine-tuning in next-to-minimal and minimal supersymmetric models with Bayesian statistics by picking non-informative priors for...
Flavour symmetries a la Froggatt-Nielsen provide a compelling way to explain the hierarchy of fermionic masses and mixing angles in the Yukawa sector. In Supersymmetric extensions of the SM where the breaking of Supersymmetry occurs at scales much larger than the breaking of flavour,
this flavour symmetry must be respected not only by the Yukawas of the superpotential, but by the soft -...
Minimal Supersymmetry offers an explanation for the Hierarchy Problem in the Standard Model of Particle Physics, however still requires fine tuning in order to receive the correct higgs mass. We can consider compressed spectrum SUSY, where we can decouple the sparticle sector from the electroweak physics and still maintain a light higgs mass. The phenomenology of such situations, including...
In $N=1$ supergravity (SUGRA) supersymmetric (SUSY) and non-supersymmetric
Minkowski vacua originating in the hidden sector can be degenerate. This allows for
consistent implementation of the multiple point principle (MPP) assumption.
We present no--scale inspired SUGRA model where the MPP assumption is realised
at the tree--level without extra fine-tuning. In the supersymmetric phase in...
A compressed spectrum is seen as an natural explanation for the elusiveness of low-energy supersymmetry at the LHC. Some characteristic signals, such as mono-jet + MET, had been accepted as its trademark signals although investigations suggested that lower limits on the supersymmetric particle masses are quite stringent in spite of compression. Also, most compressed SUSY scenarios studied so...
In this analysis we explore the phenomenological constraints of models
with non-holomorphic soft SUSY breaking terms in a beyond the MSSM scenario
having identical particle content. The model referred as NHSSM shows various
promising features like the possibility of a strong reduction in electroweak fin
e-tuning even for a scenario of a heavy higgsino type of LSP, a fact that is...
