If the strongly-interacting squarks and gluinos are light enough to be produced at the LHC, they would produce striking events with energetic objects. This talk covers recent searches for ???strong SUSY.??? Emphasis is placed on 3rd generation stops and sbottoms, which are required to be light by Higgs mass naturalness considerations. Additionally, novel searches in final states with charm...
In this talk, we will discuss the consequences of models where dark sector quarks could be produced at the LHC, which subsequently undergo a dark parton shower, generating jets of dark hadrons that ultimately decay back to Standard Model hadrons. This yields collider objects that can be nearly indistinguishable from Standard Model jets, motivating the reliance on substructure observables to...
Experimental uncertainties related to hadronic object reconstruction can limit the precision of physics analyses at the LHC, and so improvements in performance have the potential to broadly increase the impact of results. Recent refinements to reconstruction and calibration procedures for ATLAS jets and MET result in reduced uncertainties, improved pileup stability and other performance gains....
Hadronic object reconstruction is one of the most promising settings for cutting-edge machine learning and artificial intelligence algorithms at the LHC. In this contribution, selected highlights of ML/AI applications by ATLAS to particle and boosted-object identification, MET reconstruction and other tasks will be presented.
There have been a lot of developments on identification of heavy objects decaying hadronically though large-size jets based machine learning. These techniques have revolutionized searches for Supersymmetry at the LHC. In this talk, recent searches for Supersymmetry using heavy object tagging will be presented. The results are obtained from the proton-proton collision data at the center of mass...
Coloured sparticles are expected to be produced copiously at the LHC. As no squarks or gluinos have been found so far, their lower mass limits are in the TeV range, and they would therefore always be produced close to their production threshold. In this kinematical limit, potentially dangerous large logarithms can be summed systematically to all orders by means of threshold resummation...
This talk presents combinations of orthogonal search channels, which improve the sensitivity to supersymmetric models by considering multiple final states simultaneously.
The latest results from searches for electroweak production of SUSY particles with the CMS experiment will be presented. The analyses are based on the full dataset of pp collisions recorded at sqrt(s) = 13 TeV during the LHC Run 2. Searches are performed in multiple final states and the combination of those searches will be also discussed.
We consider the application of machine learning techniques to searches at the Large Hadron Collider (LHC) for pair-produced lepton partners which decay to leptons and invisible particles. This scenario can arise in the Minimal Supersymmetric Standard Model (MSSM), but can be realized in many other models. We focus on the case of intermediate bino-slepton mass splitting (~ 30 GeV), for which,...
Accommodating differing signs of the supersymmetric contributions to $g-2$ values of muon and electron can be difficult in the Minimal Supersymmetric Standard Model (MSSM) in the context of Fermilab muon ${(g-2)}_\mu$ data and electron ${(g-2)}_e$ result as obtained from the fine structure constant ($\alpha$) measurement through ${}^{133}{\rm Cs}$ matter-wave nterferometry. The latter would...
The lack of positive signals from supersymmetry searches at the LHC has pushed most of supersymmetric particles to very heavy masses. The notable exception is the electroweak sector of the MSSM which, due to their mixings and complex parameter structure, could still survive at fairly low masses. In this talk I will present a global study of the electroweak minimal supersymmetry extension of...
We revisit the minimal Nambu-Goldstone(NG)-Higgs supersymmetric (SUSY) SU(5) grand unified model and study its phenomenological implications. The Higgs sector of the model possesses a global SU (6) symmetry, which is spontaneously broken and results in the Higgs doublets of the minimal SUSY Standard Model (MSSM) as NG chiral superfields. Therefore, the model naturally leads to light Higgs...
The lack of evidence for new physics in the LHC data puts stringent constraints on supersymmetric theories. However, searches for supersymmetric particles at the LHC are made channel-by-channel in specific final states, and the results are typically presented in the context of simplified models. It is therefore important to reinterpret the results of these searches by confronting them to full...
FlexibleSUSY provides automated calculations of the mass spectrum of BSM particles and other observables such as muon g-2 precision predictions of the W and Higgs mass, and electric dipole moments in user defined extensions of the standard model. I will summarise capabilities and uses of the code with a focus on recent developments. These include recent improvements to muon g-2, MW, and the...
The majority of searches for supersymmetry assume conservation of R-parity, in which the lightest supersymmetric particle is a stable dark matter candidate that escapes detection and produces large missing transverse energy. This talk covers searches for R-parity violating supersymmetry, in which the lightest supersymmetric particle is unstable and can decay to standard model particles. These...
Many extensions of the standard model predict new particles with long lifetimes or other properties that give rise to non-conventional signatures in the detector. This talk discusses new techniques to detect such signatures in the CMS detector, and presents recent results from such searches in CMS using the full Run 2 data set of the LHC.
Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of...
The neutralinos are well-motivated dark matter candidates and have been studied extensively. If the mass difference between the neutralino and chargino is relatively small, then they can be detected as, for example, disappearing charged tracks in collider experiments. The constraint on the chargino mass by those experiments strongly depends on the chargino lifetime, and hence, it is important...
A new fundamental theory [1] unavoidably predicts supersymmetry, SO(N) grand unification, and a new description of all fundamental scalar bosons. As discussed in our previous papers [2-5] and many recent talks, this last feature in turn unavoidably predicts a dark matter WIMP which is consistent with all experimental and observational constraints, and which should be observable via direct...
The presence of a non-baryonic Dark Matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If Dark Matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS Collaboration has developed a broad search program for DM candidates in final states with large missing transverse momentum produced in association...
We discuss Dark Matter (DM) in combination of $(g-2)_\mu$ in the MSSM. Six different scenarios according to the nature of the Next-to-lightest SUSY particle are identified. All relevant bounds from LHC searches, DM relic abundance and direct detection (DD) are taken into account. We show how collider searches and direct detection experiments can fully test these scenarios.
We revisit the model where bino coannihilates with slepton and higgsino is also at electroweak scale.
We update the LHC constraints and the dark matter direct detection constraints. Also, we consider the new physics contributions to muon g-2 and we find that there remains unexplored regions.
Higher-order corrections involving (external) charginos and/or neutralinos require a renormalization of this sector. External particles should be renormalized on-shell (OS). Since the six chargino/neutralino masses are controlled by three mass parameters, many different OS renormalization schemes (RS) are possible. A given RS can be well suited to yield "stable" and "well behaved" higher-order...
In gaguge-mediated supersymmetry breaking (GMSB) scenarios, the lightest SUSY particles is a nearly massless gravitino. Searches for GMSB SUSY are presented in which the next-to-lighest SUSY particles are the higgsinos, which decay to a Higgs or Z boson and the gravitino, leading to final states with missing transverse energy and ZZ, Zh, or hh boson pairs.
Results from the CMS experiment are presented for supersymmetry searches targeting so-called compressed spectra, with small mass splittings between the different supersymmetric partners. Such a spectrum presents unique experimental challenges. This talk describes the new techniques utilized by CMS to address such difficult scenarios. The searches use proton-proton collision data at the center...
Under supersymmetry (SUSY) models with low electroweak naturalness (natSUSY), which have been suggested to be the most likely version of SUSY to emerge from the string landscape, we examine the viabilities of future search for the heavy SUSY Higgs bosons H, A, H^\pm through various their decay signatures in LHC. The traditional H, A -> tautau, as well as H^\pm -> tau+nu, t+b, with a spectator...
If the strongly-interacting squarks and gluinos are too heavy to be produced at the LHC with observable rates, searches for the weakly-interacting charginos, neutralinos, and sleptons could offer the best path to discovering supersymmetry. These particles can lead to challenging signatures with lower production rates and less energetic final state objects.
The $E_6$ inspired extension of the minimal supersymmetric (SUSY) standard model (MSSM) with an extra $U(1)_{N}$ gauge symmetry, under which right-handed neutrinos have zero charge, involves exotic matter beyond the MSSM to ensure anomaly cancellation. In particular, there are three families of extra exotic quarks and several $SU(2)_W$-doublets that have the quantum numbers of the MSSM Higgs...
The latest results of searches for supersymmetry in photonic final states with the CMS experiment will be presented. The analyses are based on the full dataset of proton-proton collisions collected during the Run 2 of the LHC at a center-of-mass energy of 13 TeV. The results are interpreted in models including the stealth SUSY models and gauge mediated supersymmetry breaking models.
