The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area with connections to dark matter and the naturalness of the Higgs mass. The small production cross-sections and challenging experimental signatures lead to difficult searches. This talk will highlight the most recent results of searches performed by the ATLAS...
A wide variety of searches for Supersymmetry have been performed by experiments at the Large Hadron Collider. In this talk, we focus on searches for electroweak production of Supersymmetric particles as well as third generation Supersymmetric particles. Some analyses are optimized for Supersymmetric particles in compressed spectra. The results are obtained from the proton-proton collision data...
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results of searches conducted by the...
We discuss the possibility that light new physics in the top quark sample at the LHC can be found by investigating with greater care well known kinematic distributions, such as the invariant mass mbโโ of the b-jet and the charged lepton in fully leptonic ttbar events. We demonstrate that new physics can be probed in the rising part of the already measured mbโmbโโ distribution. To this end we...
The search for weakly interacting particles is one of the main objectives of the high luminosity LHC. In the Minimal Supersymmetric Extension of the Standard Model (MSSM), these particles include the lightest neutralino, which is a good Dark Matter candidate and whose relic density may be fixed to realistic values through its co-annihilation with the second lightest neutralino and lightest...
As in arXiv:2307.04255, we consider a radically modified form of supersymmetry (called susy here to avoid confusion), which initially combines standard Weyl fermion fields and primitive (unphysical) boson fields. A stable vacuum then requires that the initial boson fields, whose excitations would have negative energy, be transformed into three kinds of scalar-boson fields: the usual complex...
Superstring flux compactifications can stabilize all moduli while
leading to an enormous number of vacua solutions,
each leading to different $4-d$ laws of physics.
While the string landscape provides at present the only plausible explanation
for the size of the cosmological constant, it may also predict the form of
weak scale supersymmetry which is expected to emerge.
Rather general...
In this talk, I will present recent results on precision calculations for the squark-(anti)squark production processes at the LHC with a center-of-mass energy of $\sqrt{S} = 13.6$ TeV in the framework of the Minimal R-symmetric Supersymmetric Standard Model (MRSSM). In contrast to the Minimal Supersymmetric Standard Model (MSSM), the MRSSM has a higher degree of symmetry, which affects, in...
The split-supersymmetry method was proposed to address the naturalness (or hierarchy) problem in physics beyond the standard model without the need for a light supersymmetric spectrum. This talk will address this mechanism for supersymmetry breaking within a finite grand unification model, particularly in the $SU(3)^3$ model, motivated by a scenario of anomaly-mediated SUSY breaking....
Rather general considerations from the string landscape imply a statistical draw to large soft terms which must be tempered by a pocket-universe derived value of the weak scale within the ABDS window. The statistical approach realizes Douglas' notion of stringy naturalness leading to mh~125 GeV and sparticles somewhat or well beyond present LHC search limits. Light higgsinos ~100-350 GeV are...
In this talk I will present results from two new GAMBIT studies of LHC searches for supersymmetry, the largest such GAMBIT studies to date. We focus on LHC searches for charginos and neutralinos, and consider both scenarios with and without a gravitino as the lightest supersymmetric particle. By running full event simulations at each sampled MSSM parameter point, we carry out detailed and...
The most recent searches by the ATLAS and CMS Collaborations in final states with soft leptons and missing transverse energy show mild excesses predominantly associated with dilepton invariant masses of about 10-20 GeV, which can result from decays of electroweakinos that are heavier than the lightest neutralino by $\mathcal{O}(10)$ GeV. On the other hand, these analyses are insensitive to...
We discuss the various excesses observed consistently between ATLAS and CMS in the search for $pp \to \tilde\chi_2^0 \tilde\chi_1^\pm$. We analyze the MSSM scenarios that can accommodate these excesses, as well as their phenomenological implications for current and future colliders.
We unveil blind spot regions in dark matter (DM) direct detection (DMDD), for weakly interacting massive particles with a mass around a few hundred~GeV that may reveal interesting photon signals at the LHC. We explore a scenario where the DM primarily originates from the singlet sector within the $Z_3$-symmetric Next-to-Minimal Supersymmetric Standard Model (NMSSM). A novel DMDD...
To maximise the information obtained from various independent new physics searches conducted at the LHC, it is imperative to contemplate the combination of multiple analyses. We consider a simplified SUSY scenario with all particles but one squark flavor and a bino-like neutralino decoupled to showcase the exclusion power gained by combining uncorrelated signal regions from different searches....
Since the classic searches for supersymmetry under R-parity conserving scenarios have not given any strong indication for new physics yet, more and more supersymmetry searches are carried out on a wider range of supersymmetric scenarios. This talk focuses on searches looking for signatures of stealth and R-parity-violating supersymmetry. The results are based on proton-proton collisions...
Various theories beyond the Standard Model predict new, long-lived particles decaying at a significant distance from the collision point. These unique signatures are difficult to reconstruct and face unusual and challenging backgrounds. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer are examples of experimentally demanding signatures....
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. With increasing mass bounds on MSSM scenarios other non-minimal variations of supersymmetry become increasingly interesting. This talk will present the latest results of searches conducted by the ATLAS experiment...
A wide variety of searches for Supersymmetry have been performed by experiments at the Large Hadron Collider. In this talk, we focus on searches for electroweak production of Supersymmetric particles as well as third generation Supersymmetric particles. Some analyses are optimized for Supersymmetric particles in compressed spectra. The results are obtained from the proton-proton collision data...
Supersymmetry (SUSY) models with featuring small mass splittings between one or more particles and the lightest neutralino could solve the hierarchy problem as well as offer a suitable dark matter candidate consistent with the observed thermal-relic dark matter density. However, the detection of SUSY higgsinos at the LHC remains challenging especially if their mass-splitting is O(1 GeV) or...
In this work, we explore a well motivated beyond the Standard Model
scenario, namely, R-parity violating Supersymmetry, in the context of light neutrino
masses and mixing. We assume that the R-parity is only broken by the lepton
number violating bilinear term. We try to fit two non-zero neutrino mass square
differences and three mixing angle values obtained from the global ฯ 2 analysis...
Proton decay, although unobserved so far, is a natural expectation when attempting to explain the baryon asymmetry of the universe. p→K+νยฏ or p→K+χ̃ 01, with χ̃ 01 a light exotic neutral particle, represent possible decay channels achievable in models of physics beyond the Standard Model, such as the MSSM with trilinear R-parity violating terms, or the...
We conduct a model-independent analysis for exotic colored scalars, such as leptoquarks and diquarks, naturally predicted by the E$_{6}$SSM at the LHC with a center-of-mass energy of 13TeV. This analysis focuses on their pair production and subsequent decay into $t \bar{t}\tau \bar{\tau}$ (for leptoquarks) and $t \bar{t} b \bar{b}$ (for diquarks) intermediate states. In the case of...
Even though the light Higgs bosons receive a strong negative impact from the experimental analyses, the extensions of MSSM can consistently place such light scalars in the low scale spectrum. These light scalar can be tested in near future analyses through their decays into SM gauge bosons and/or fermions. Even though the current results rather provide strong exclusions, these scalars can...
Supersymmetric models with low electroweak finetuning are expected to be more prevalent on the string landscape than finetuned models. We assume a fertile patch of landscape vacua containing the minimal supersymmetric standard model (MSSM) as low energy/weak scale effective field theory (LE-EFT). Then, a statistical pull by the landscape to large soft terms is balanced by the requirement of a...
We present the production rates of colored states at a multi-TeV muon collider. We include the cases of a color-triplet scalar, color-triplet fermion, color-octet scalar, and color-octet fermion.
Recently, a novel collider, called $\mu$TRISTAN, has been proposed, offering the capability to achieve high-energy collisions of anti-muons.
This high-energy collider presents an exceptional opportunity for the discovery of electroweak-interacting massive particles (EWIMPs), which are predicted by various new physics models.
In a lepton collider like $\mu$TRISTAN, the potential for...
