The dark shower collider phenomenology splits the signatures into the “semi-visible” and “emerging-jets”, corresponding to seemingly orthogonal simplified models (s-channel vs t-channel). However, those are not exclusive signatures, and hence I will discuss how to hunt for dark showers that give visible and invisible displaced signatures. These Semi-Visible Emerging Jets (SVEJ) have striking...
We propose a novel scheme for performing a beam-dump-like experiment with the general-purpose detectors (ATLAS and CMS) at the LHC. Collisions of high-energy protons result in jets containing a number of energetic hadrons and electromagnetic objects that are essentially “dumped” to hadronic and electromagnetic calorimeters, respectively, and induce the production of secondary hadrons,...
In this talk, I will present the [reinterpretation][1] of the early Run-3 displaced-jets search at CMS[ [Rep. Prog. Phys. 88 (2025) 037801]][2] for emerging-jets signatures. The search analyzes a data sample of proton-proton collisions at a center-of-mass energy of 13.6 $\mathrm{TeV}$, corresponding to an integrated luminosity of 34.7 $\mathrm{fb}^{-1}$, collected with the CMS detector at...
Semi-visible jet signatures have rich phenomenology for experiments to explore. While the details of the dark shower parameters are being studied carefully, the community has identified a critical parameter, $r_\mathrm{inv}$, to capture the main characteristics of such signatures. It is the fraction of invisible dark hadron decays. $r_\mathrm{inv}$ is correlated with key observables in the...
We present the phenomenology of the electroweak portal dark shower. The talk will include a brief introduction to the UV theory. We will also present model-independent experimental bounds from current LHC data and future projections.
Within the Hidden Valley (HV) scenario, for a QCD-like dark sector, novel experimental signatures emerge, characterized by sprays of particles resembling hadronic jets containing stable dark bound states. The resulting signature is characterised by missing momentum aligned with one of the jets, and is known as semi-visible jets (SVJs). We investigate the potential role of the Higgs boson as a...
In the context of Dark Matter detection at colliders, several new signatures have emerged that bridge experimental data with the theoretical models. Among these, Semi-Visible Jets (SVJs) represent a novel promising signature, particularly those mediated by a resonant Z′ boson that enables the production of heavy dark hadrons. In such a scenario, jets consist of both visible SM particles and...
The confining and asymptotically free nature of confining Hidden Valleys (HVs) naturally give rise to long-lived mesons and to “dark showers”. Due to the vast theory space inherent to HV theories, we seek to reinterpret existing collider searches by keeping the mediator properties fixed while varying parameters of the HV theory itself. Such an endeavour necessitates accurate modelling of the...
We present a search for strongly coupled dark matter in the form of semi-visible jets (SVJs) using the full Run~2 CMS dataset. SVJs arise in Hidden Valley models with a confining dark QCD sector, where dark quarks produced via \textit{t}-channel scalar exchange hadronize into dark hadrons---some decaying to Standard Model particles and others escaping detection. This results in jets with both...
We investigate classes of models that can produce a wide range of r_inv values. The model parameter ranges are chosen to occupy phase space regions that are well-understood from perturbative and lattice QCD results. Different parameter variations can change r_inv while preserving similar showering behavior or produce different showers with degenerate or near-degenerate r_inv values. We present...
Comparison of currently used MLM matching scheme and more well motivated CKKWL scheme for t-channel SVJ production will be presented.
Using CONTUR, we studied the viability of a Semi-Visible Jet with leptons (SVJ-l) model, a Beyond the Standard Model (BSM) signature that proposes a connection between the Standard Model and the Dark Sector, mediated by a Z' boson. We probed the possible parameter space of the model by scanning against existing LHC measurements to assess the exclusion of our SVJ-l signals. We performed a...
