Conveners
Supersymmetry: Models, Phenomenology and Experimental Results: Session 2
- Antonio Delgado (University of Notre Dame (US))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 1
- Hannsjorg Weber (Fermi National Accelerator Lab. (US))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 3
- Hannsjorg Weber (Fermi National Accelerator Lab. (US))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 4
- Reina Coromoto Camacho Toro (Centre National de la Recherche Scientifique (FR))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 5
- Antonio Delgado (University of Notre Dame (US))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 6
- Radovan Dermisek (Indiana University (US))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 7
- Radovan Dermisek (Indiana University (US))
Supersymmetry: Models, Phenomenology and Experimental Results: Session 8
- Stephen Martin (Northern Illinois University)
Supersymmetry: Models, Phenomenology and Experimental Results: Session 9
- Zachary Louis Marshall (University of California Berkeley (US))
Current experimental searches for new physics seem to have cornered the simplest versions of the Minimal Supersymmetric Standard Model (MSSM). Then, we are compelled to consider less constrained scenarios such as the phenomenological MSSM (pMSSM). However, scanning the parameter space of the pMSSM looking for configurations that fulfil all the experimental bounds is known to be a...
Despite the absence of experimental evidence, weak-scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks of the first two generations, and gluinos in R-parity conserving models that predict dark matter candidates. The searches target final states including jets,...
I will present the quartification Grand Unified Theory as a new extension of the supersymmetric trinification model with a local family SU(3)_F symmetry. I will discuss its origin inspired by the breaking of E8 into E6 x SU(3)_F and will briefly address how such a construction may possibly provide a chiral theory. The evolution of the gauge couplings to low energy-scales will be thoroughly...
Searches for the pair-production of colored supersymmetric particles in events without isolated leptons are presented. The results cover different scenarios of gluino and squark production. The interpretation includes models of split supersymmetry that predict long-lived gluinos. The results are based on proton-proton collisions recorded at sqrt(s) = 13 TeV with the CMS detector.
Many supersymmetric scenarios feature final states with non-standard final state objects. The production of massive sparticles can lead to the production of boosted top quarks or vector bosons, high-pt b-jets. At the same time, transitions between nearly mass-degenerate sparticles can challenge the standard reconstruction because of the presence of very soft leptons or jets. The talk will...
We use the IR fixed point predictions for gauge couplings and the top Yukawa coupling in the MSSM extended with vectorlike families to infer the scale of vectorlike matter and superpartners. We quote results for several extensions of the MSSM and present results in detail for the MSSM extended with one complete vectorlike family. We find that for a unified gauge coupling α_G>0.3 vectorlike...
Although the standard model of particle physics is successful in describing physics as we know it, it is known to be incomplete. Many models have been developed to extend the standard model, none of which have been experimentally verified. One of the main hurdles in this effort is the dimensionality of these models, yielding problems in analysing, visualising and communicating results. Because...
Searches for the pair-production of colored supersymmetric particles in events with one or more isolated leptons are presented. The results cover different scenarios of gluino and squark production. The leptons can originate from the decays of vector bosons or supersymmetric lepton partners produced in the decay chain. The results are based on proton-proton collisions recorded at sqrt(s) = 13...
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. The phenomenology ranges from final states of top or bottom quark pairs and two dark matter candidates, to more complex scenarios involving non-prompt sparticle decays or R-parity violating signatures. This...
In natural GUT, various problems in SUSY GUT, including the doublet-triplet splitting problem, can be solved with a natural assumption in which all interactions (incl. higher dimensional interactions) which are allowed by the symmetry are intoduced with O(1) coefficients. In the models, the Fayet-Iliopoulos (FI) term plays an important role. The FI term can also play an critical role in...
In supersymmetric models with scalar sequestering, superconformal strong dynamics in the hidden sector suppresses the low-energy couplings of mass dimension two, compared to the squares of the dimension one parameters. Taking into account restrictions on the anomalous dimensions in superconformal theories, I point out that the interplay between the hidden and visible sector renormalizations...
The accumulation of 36fb-1 of data at 13 TeV has been a unique window for supersymmetry searches at the LHC, allowing the CMS collaboration to search for specific supersymmetric particles. This talk covers searches of supersymmetric particles of 3rd generation squarks, which might be the only sparticles produced at the LHC, other sparticles being too heavy. It will highlight "compressed...
We present a four-dimensional model where the Higgs mass is protected from the quadratic one-loop top quark corrections by scalar particles that do not carry standard model (SM) color charges. They can even be complete SM singlets. The cancellation of the quadratic divergence is ensured by a Z_3 symmetry that relates the SM top sector and two hidden top sectors, each charged under its own...
Searches for supersymmetry at the LHC have pushed the mass limits for strongly-produced sparticles to the TeV level. At this scale, even heavy decay products such as vector or Higgs bosons can be produced at high transverse momenta and make the reconstruction and identification of boosted objects to an essential tool for current and future searches for supersymmetry. The talk summaries the use...
In scenarios of the Minimal Supersymmetric Standard Model where the gravitino is the LSP and the Stop is the NLSP, the Stop could have a long life-time, which makes it a quasi-stable particle that requires special strategies for its search at hadron colliders. We calculate the lifetime for the stop decay in different regions of parameter space where the different N-body modes are open,...
Pure higgsinos are among the simplest and best-motivated candidates for a weakly-interacting thermal relic. However they are rather elusive, evading easy constraint by experiment due to their weak interactions with ordinary matter and small inter-state splittings. I will review the current experimental constraints on pure higgsinos, and present ways in which we can improve the sensitivity to...
We study the Next-to-Minimal Supersymmetric Standard Model (NMSSM)
with non-universal gaugino masses at the unification scale.
A singlet superfield is added to the minimal supersymmetric (SUSY)
extension of the Standard Model.
Its vacuum expectation value gives a SUSY-scale mass term for higgsinos.
The presence of the singlet field makes the Higgs potential complicated
and it is non-trivial...
Many supersymmetry models feature gauginos and sleptons with masses less than a few hundred GeV. These can give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents recent ATLAS results from searches for slepton pair production.
Searches for the production of supersymmetric partners of electroweak gauge and Higgs bosons are presented. The focus of the talk will be on SUSY models with compressed mass spectra, as they are expected if the lightest of these states are dominantly partners of the Higgs bosons. The talk will also cover searches for the direct production of supersymmetric partners of electrons and muons. The...
Charginos and neutralinos are typically the lightest new particles predicted by a wide range of supersymmetry models, and the lightest neutralino is a well motivated and studied candidate for dark matter in models with R-parity conservation. The talk presents recent results from searches for pair produced charginos and neutralinos in final states with leptons and missing transverse momentum.
Searches for the supersymmetric particles in events with one or more hadronically decaying tau leptons are presented. The results focus on the stau pair production, and in addition address scenarios with electroweakly produced SUSY particles leading to final states with multiple tau leptons. The results are based on proton-proton collisions recorded at sqrt(s) = 13 TeV with the CMS detector.
Fine-tuning arguments suggest the mass of the supersymmetric partner of the Higgs boson, the higgsino, is not too far from the weak scale. The search for higgsinos represents an experimental challenge due to the near mass-degeneracy resulting in soft decay products, and the low production cross section. This talk presents recent ATLAS results of analyses explicitly targeting the higgsino with...
In models with Higgs sectors larger than 2 Higgs doublets, as for example found in the Next-to-Minimal Supersymmetric Standard Model (NMSSM), decays of heavy Higgs bosons into pairs of lighter Higgs bosons or a Z boson and a light Higgs (so-called Higgs cascade decays) can have large branching ratios. The presence of the 125 GeV SM-like mode suppresses the couplings of additional heavy Higgs...
Events with isolated photons in the final state can be used in multiple ways to search for supersymmetry. Depending on the composition of the lightest neutralino state, decays to a photon and the gravitino can be a dominant signature for models with gauge-mediated supersymmetry breaking. Photons are also a tool for the identification of Higgs bosons in the decay chains of supersymmetric...
Based on arXiv:1801.08849, this talk will look at how Higgs alignment can be realised naturally in a low energy type-II Higgs doublet model, originating from Dirac gaugino models with extended supersymmetry at higher energies. It will be discussed how alignment, predicted at tree-level at the scale of the extended supersymmetry, is maintained in the low energy effective theory even after...
We study the electroweak phenomenology of Higgs Inflation within the Next-to-minimal Supersymmetric Standard Model (NMSSM). The model has a superconformal symmetry at high scales which is broken by the non-minimal coupling to supergravity responsible for early universe inflation. At low energies, however, the model differs from the usual NMSSM. With an emphasis on the Higgs and Neutralino...
Is supersymmetry fading? Or is there still enough experimental evidence to support our faith in it? In search of a quantitative answer, I review the latest GAMBIT results for the CMSSM, NUHM1 and 2, MSSM7 and MSSM9.
We have explored a minimal supersymmetric Standard Model scenario extended by one pair of gauge singlets per generation, where light neutrino masses and mixing are generated via inverse seesaw mechanism. In such a scenario, a right-handed sneutrino can be the lightest supersymmetric particle and a cold Dark Matter (DM) candidate. We have studied the constraints on such a scenario arising from...
We present a study of searching for massive long-lived particles at the MoEDAL detector. MoEDAL is sensitive to highly ionizing avatar such as magnetic monopoles or massive (meta-)stable charged particles and we focus on the latter in this talk. In the ATLAS and CMS analyses for long-lived particles, some conditions are usually required for triggering or reducing the cosmic ray background,...
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks of the first two generations, and gluinos in less conventional scenarios including R-parity violating models that typically lead to high-multiplicity final...
Searches for R-parity conserving supersymmetry have set stringent limits on sparticle masses. In R-parity violating (RPV) models the characteristic missing transverse momentum signature is absent and these constraints do not apply. Specific searches are designed to detect production and decay of supersymmetric particles via RPV couplings. Results are presented based on data recorded by the CMS...
From strongly produced initial states, SUSY phenomenology offers a rich array of observable signatures. Several supersymmetric models predict massive long-lived supersymmetric particles that may be detected through abnormal specific energy loss, appearing or disappearing tracks, displaced vertices, long time-of-flight or late calorimetric energy deposits. This talk summarises recent ATLAS...
Experimental limits from LHC searches on the masses of SUSY states are becoming quite stringent, especially for the gluino of the MSSM. The MRSSM is an alternative supersymmetric model featuring an unbroken R-symmetry. This leads leads to the prediction of a Dirac-type gluino. Compellingly, it is natural for a Dirac gluino to have a large mass outside the current bounds. The Dirac nature also...
We compare models with a non-universal
gaugino and/or sfermion sector in different grand unification scenarios,
namely SO(10), SU(5), flipped SU(5) and Pati-Salam unification. We explore the different
constraints arising from LHC supersymmetry searches and dark
matter experiments. We also investigate whether the models can predict a
significant SUSY contribution to the muon g-2. We find that...
We implement inflation in realistic supersymmetric and non-supersymmetric extensions of the Standard Model. We compare and contrast a number of predictions related to primordial gravity waves, dark matter and proton decay.
A massive particle charged under the electroweak gauge symmetry, such as a Higgsino and Wino, is one of the most promising candidate of the dark matter and called "Minimal dark matter." Such electroweakly interacting particle will affect the standard model processes thorough quantum effects. In this talk, I will discuss search strategies for such a dark matter with precision measurements of...
It is one of the major issues to realize a vacuum which breaks supersymmetry (SUSY) and R-symmetry, in a supersymmetric model. We study the model, where the same sector breaks the gauge symmetry and SUSY. In general, the SUSY breaking model without gauge symmetry has a flat direction at the minimum of F-term scalar potential. When we introduce U(1) gauge symmetry to such a SUSY breaking model,...
Natural SUSY models have Higgsinos as the lightest supersymmetric
particles with masses of at most a few hundred GeV. Assuming
that the gauginos are significantly heavier this implies that the
relic dark matter density is significan below the observed values.
At the same time neutrino masses need to be explaine. We propse
thus a model with light right-handed (s)neutrinos where the...
We have investigated the constrained minimal supersymmetric standard model with three right-handed Majorana neutrinos whether there still is a parameter region which is consistent with all existing experimental data/limits such as Leptogenesis and the dark matter abundance and we also can solve the Lithium problem. Using Casas-Ibarra parameterization, we have found that a very narrow parameter...
How light can a fermion be if it has unit electric charge? We revisit the lore that LEP robustly excludes charged fermions lighter than about 100 GeV. We review LEP chargino searches, and find them to exclude charged fermions lighter than 90 GeV, assuming a higgsino-like cross section. However, if the charged fermion couples to a new scalar, destructive interference among production channels...
Searches for GUT-inspired heavy gauge bosons Z' have been so far carried out by assuming that they can decay according to Standard Model modes, namely dilepton and dijet final states. I will discuss Z' phenomenology in a U(1) extension of the MSSM, where it can decay into sleptons, squarks and gauginos, leading to final states
with charged leptons and missing energy. In particular, I will...
Despite the absence of experimental evidence, Supersymmetry remains attractive from the theoretical and phenomenological point of view. In order to comply with the stringent experimental constraints, non-minimal realizations of the theory have to be considered. While typical studies are carried out assuming minimal flavour violation (MFV), I will focus on the hypothesis of non-minimal flavour...
The observed Higgs boson at the LHC gives information of the supersymmetric (SUSY) extensions of the standard model. In particular, to explain the mass of the observed Higgs boson, the SUSY scale should be above several TeV scale.
Further, the mixings and CP phases in the neutrino sector have been revealed by various neutrino experiments.
In the supersymmetric grand unified theories (SUSY...
We present the current perspectives for SUSY at the LHC in Run 2 and beyond, and at future colliders, in a phenomenological Minimal Supersymmetric Standard Model with eleven parameters (pMSSM11) and in the subGUT-CMSSM, where the input scale, $M_{in}$, at which the soft SUSY breaking terms are universal is treated as an additional free parameter in the sampling instead of being assumed to be...
Missing Transverse Momentum is an extremely important quantity in the searches for RPC Supersymmetry. The accurate reconstruction of this quantity in high pile-up conditions is challenging. Missing transverse momentum is reconstructed from the vector sum of reconstructed objects. Energy from pile-up collisions enter jet cones altering the scale of jets and also increasing the resolution....
The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver an integrated luminosity of up to 3000 fb-1. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (“pileup”) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. The sensitivity to find new physics Beyond the...
A future proton-proton collider with center of mass energy around 100 TeV will have a remarkable capacity to discover massive new particles and continue exploring weak scale naturalness. In this work we will study its sensitivity to two stop simplified models as further examples of its potential power: pair production of stops that decay to tops or bottoms and Higgsinos; and stops that are...
Sparticls with smaller mass gaps are used successfully to understand the correct dark matter content of the universe. In this talk, I will discuss slepton pair-production processes with soft leptons (plus at least one jet) and small missing transverse energyassociated with a mass difference between the lightest neutralino and the lightest slepton (Δm) is ≲60 GeV. We utilize the angular...
