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Poster
The ANUBIS experiment is a proposed transverse LLP experiment that would be located on the ceiling of the ATLAS cavern, in the LHC. Its sensitivity to an uncharted region of LLP phase-space, favouring high lifetimes and heavy mediators, compliments the sensitivity of general-purpose detectors as well as longitudinal ones. ProANUBIS, the prototype version of ANUBIS, has been taking data in the...
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Jeremi Niedziela (Vrije Universiteit Brussel (BE))Poster
We investigate the physics potential of SHIFT@LHC, a proposed gaseous fixed target installed in the LHC tunnel, as a novel source of detectable neutrinos. Using simulations of proton-gas collisions, hadron propagation, and neutrino interactions, we estimate that O(10^4) muon-neutrino and O(10^3) electron-neutrino interactions, spanning energies from 20 GeV to 1 TeV, would occur in the CMS and...
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Poster
The ATLAS experiment is implementing a comprehensive software upgrade for Phase-II of the LHC,
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centred on a new all-silicon Inner Tracker (ITk). A key component of this effort is the migration
of track reconstruction to ACTS, an experiment-independent, thread-safe, high-performance tracking
toolkit. While the primary track reconstruction pass ($|d_0| < 2$~mm) has already been... -
Alejandro Novo Cal (Universidade de Santiago de Compostela (ES))Poster
The COmpact DEtector for EXotics at LHCb (CODEX-b) is a proposed detector dedicated to searches for displaced decays of long-lived particles (LLPs) motivated by dark-sector scenarios beyond the Standard Model. The detector is designed as a 10 × 10 × 10 m³ cube of Resistive Plate Chamber (RPC) triplet units with two internal sections, to be installed near the LHCb interaction point. Its design...
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Alberto Martinez Armas (Universidade de Santiago de Compostela (ES))Poster
CODEX-b (COmpact DEtector for EXotics at LHCb) is a proposed transverse detector dedicated to searches for Beyond the Standard Model (BSM) physics through signatures involving Long-Lived Particles (LLPs) with displaced decays. Located in the LHCb cavern, the detector would consist of a 10 × 10 × 10 m³ array of Resistive Plate Chamber (RPC) triplet units, providing sensitivity to regions of...
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Martin Alcalde Martinez (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))Poster
We present a reinterpretation of selected ATLAS and CMS searches for Higgs boson decays into long-lived particles (LLPs) within the scalar portal framework, where the Standard Model is extended by a light scalar that mixes with the Higgs boson. Using public HEPData results, we evaluate the sensitivity of several experimental strategies targeting different final states. The study also...
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Poster
The FORMOSA detector at the proposed Forward Physics Facility is a scintillator-based experiment designed to search for signatures of "millicharged particles" produced in the forward region of the LHC. A pathfinder experiment, the FORMOSA demonstrator, was installed in the FASER cavern at the LHC in early 2024 and has been collecting collisional data. New results, including leading...
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Poster
The High-Luminosity phase of the LHC will introduce unprecedented data rates and pileup conditions, demanding innovative trigger technologies to identify signatures that could uncover new physics with the CMS detector. This talk presents the work done to identify long-lived particle (LLP) decays within the Phase-2 CMS L1 Muon Trigger system. LLPs can produce displaced and unconventional...
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Poster
Particle track reconstruction is one of the most computationally expensive process, which can create a bottleneck in the data processing pipeline. Graph neural networks have been presented as a viable machine learning approach to speed up the track reconstruction process. MATHUSLA is a proposed particle detector to be built at CERN above CMS in order to detect long lived particles produced in...
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Poster
We present an analysis of charged long-lived particle pair production at FCC-ee at $\sqrt{s} = 240~GeV$, focusing on the tracking capabilities of the IDEA detector. In particular, we study long-lived staus, the supersymmetric partners of the tau lepton, decaying within the detector into a tau lepton and a gravitino. These decays give rise to distinctive signatures such as kinked tracks and...
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Poster
Long-lived particles (LLPs) decaying outside the inner tracker volume leave little or no information in the silicon and drift chamber subsystems, making the muon system the only detector capable of reconstructing such tracks at FCC-ee. We present a comprehensive study of the IDEA muon system, designed as a standalone tracker, with a focus on its capabilities for highly displaced...
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Poster
The ANUBIS experiment proposal aims to extend experimental sensitivity to very long-lived particles in the HL-LHC via instrumenting the ceiling of the ATLAS cavern with RPC detectors. The proANUBIS detector, consisting of one prototype module of the planned design for ANUBIS, was installed on the scaffolding near ATLAS and collected cosmic and collision data from 2024 to 2025 in order to...
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Poster
ANUBIS is a proposed transverse detector to be located on the roof of the ATLAS cavern, providing sensitivity to LLPs with macroscopic lifetimes. Axion-like particles (ALPs) are pseudo-scalar particles with a more generic parameter space than the QCD axion, and are of interest as a Physics Beyond Colliders benchmark case. The fermion-coupled ALP benchmark has been analysed with investigations...
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Poster
Long-Lived Particles (LLPs) have strong potential to explain some of the missing components of the Standard Model (SM), such as the nature of Dark Matter (DM) and the origin of the neutrino masses via the seesaw mechanism. The ANUBIS experiment is a dedicated transverse detector, located above the ATLAS Interaction Point (IP) at the LHC, designed to probe particles with proper lifetimes τ >...
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Poster
More than a decade after the Large Hadron Collider (LHC) at CERN started taking data, no clear hint of New Physics has been observed. The preferential coupling of Axion-Like Particles (ALP) to third generation quarks, particularly top quarks, in scenarios where the ALP’s lifetime enhances its decay within the ATLAS detector, leading to displaced jets, has not been explored in detail. In this...
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Jyotismita Adhikary (NCBJ, Warsaw)Poster
Standard sensitivity estimates for far-forward mCP searches at the LHC focus exclusively on production at the interaction point. We show that the forward LHC particle absorber acts as a significant secondary source: energetic forward neutrons and photons initiate hadronic and electromagnetic showers that generate an additional mCP flux. Using Monte Carlo simulations interfaced with Geant4, we...
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Poster
In popular beyond the standard models (BSMs) with sub-GeV vector bosons, the exotic vector boson can be long-lived for certain regions of the mass-coupling parameter space. At $e^+e^−$ colliders, these particles can be searched through displaced decays, where the particles travel a finite distance before decaying. In such searches, two main challenges are reconstructing these events in the...
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