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Sabine Kraml (LPSC Grenoble)25/02/2025, 14:00
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Clarisse Prat25/02/2025, 14:15
In this study, we place constraints on a composite t-channel dark matter model using CONTUR and MadAnalysis 5. The model is similar to those currently being studied by the DM working group and is representative of composite dark matter constructions, with a scalar dark matter candidate and three VLQ partners (mediators). We investigate the exclusions obtained from the subprocesses in LO and...
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Simon Jeannot25/02/2025, 14:35
A method to derive constraints on new physics models featuring exotic long-lived particles using detector-corrected measurements of prompt states is presented. The CONTUR workflow is modified to either account for the fraction of long-lived particles which decay early enough to be reconstructed as prompt, or to be sensitive to the recoil of such particles against a prompt system. This makes it...
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Junyi Cheng (Harvard University)25/02/2025, 14:55
The ATLAS collaboration, using 139 fb$^{-1}$ of 13 TeV collisions from the Large Hadron Collider, has placed limits on the decay of a $Z$ boson to three dark photons. We reproduce the results of the ATLAS analysis, and then recast it as a limit on a exotic Higgs decay mode, in which the Higgs boson decays via a pair of intermediate (pseudo)scalars $a$ to four dark photons $V$ (or some other...
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Manuel Kunkel25/02/2025, 15:15
I will present the results of two recent recasting studies using MadAnalysis5, CheckMATE and Rivet/Contur. I will focus on processes that are interesting for composite Higgs models. The first is a study of Drell-Yan production of extended Higgs sectors, putting upper limits on cross section times branching ratio for a large number of final states. Besides the limits themselves, this serves as...
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Nicoline Hemme25/02/2025, 16:10
In this contribution, we will present our recent studies on recasting various ATLAS and CMS analyses in the context of dark QCD models. The analyses were implemented in MadAnalysis5 and the reinterpretation is done focussing on an s-channel Z' portal decaying to two dark quarks which lead to a signature of semi-visible jets with varying invisible fraction.
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Manimala Mitra25/02/2025, 16:30
Heavy neutral lepton (HNL) states can exist at the electroweak scale and can be investigated through current and future collider experiments. The scenario, where other new physics interactions occur at scales much higher than the HNL scale, can be described using an effective field theory (EFT) framework known as NR-EFT. We focus on constraining the Wilson coefficients of NR-EFT operators,...
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Andre Lessa (CCNH - Univ. Federal do ABC)25/02/2025, 16:50
We consider a simple Dark Matter model containing both a scalar and a vector mediator. The model provides a framework for generating the mediators and Dark Matter masses while maintaining a small number of free parameters. Using simplified model results from missing energy and resonance searches, we discuss how well this model is probed by current searches and the interplay between the...
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Hridoy Debnath25/02/2025, 17:10
We discuss a class of theories that predict a fermionic dark matter candidate from gauge anomaly cancellation. As an explicit example, we study the predictions in theories where the global symmetry associated with baryon number is promoted to a local gauge symmetry. In this context, the symmetry-breaking scale has to be below the multi-TeV scale in order to be in agreement with the...
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Dr Giacomo Ortona (Universita e INFN Torino (IT))25/02/2025, 17:30
This talk will give an overview of the CMS statistical model format (Combine datacards) and demonstrate their evaluation with Combine. In addition the review process automated in gitlab-ci will be highlighted.
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Kati Lassila-Perini (Helsinki Institute of Physics (FI))26/02/2025, 09:00
As agreed in the CERN Open Data policy, all LHC experiments are committed to releasing research-quality open data. CMS has pioneered this effort and now celebrates a decade of regular data releases, with all LHC Run 1 data available in the public domain and ongoing releases of Run 2 data. This talk will provide an opportunity for the audience to reflect on what makes event-level open data...
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Peter Meinzinger (Zürich University)26/02/2025, 09:25
For the development of modern event generators, the comparison to data is an invaluable tool for the tuning and validation of the code. I will review efforts where the comparisons to data from past colliders have allowed for improvements and extensions of event generators, with an emphasis on photoproduction and hard diffraction at HERA.
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Zach Marshall (Lawrence Berkeley National Lab. (US))26/02/2025, 09:45
This contribution will describe ongoing efforts to provide event generation output to the broader community. There are a number of advantages that such a project could offer: reduced waste, easier project uptake, better validation, and improved communication between the experimental and phenomenological communities, among others.
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Giovanni Guerrieri (CERN)26/02/2025, 10:05
Experiment analysis frameworks, physics data formats, and the expectations of LHC scientists have evolved towards including interactive analysis with short turnaround times and the possibility to optimize reproducible and re-interpretable workflows.
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The CERN IT's Pilot Analysis Facility, the CERN Virtual Research Environment, and REANA have emerged as key solutions, as well as a platform... -
Sukanya Sinha (The University of Manchester (GB))26/02/2025, 10:25
One of the objectives of the EOSC (European Open Science Cloud) Future Project was to integrate diverse analysis workflows from Cosmology, Astrophysics and High Energy Physics in a common framework. This led to the inception of the Virtual Research Environment (VRE) at CERN, a prototype platform supporting the goals of Dark Matter and Extreme Universe Science Projects in compliance with FAIR...
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Graeme Watt26/02/2025, 11:15
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Dr Carsten Burgard (Technische Universitaet Dortmund (DE))26/02/2025, 11:35
The complexity of modern high-energy physics (HEP) experiments demands robust, flexible, and interoperable tools for statistical modeling. The HEP Statistics Serialization Standard (HS³) addresses this need by providing a unified framework for serializing statistical models and datasets in HEP research that allows to seamlessly switch between different implementations and modeling frameworks....
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Abdelhamid Haddad (Laboratoire de Physique de Clermont-Auvergne (LPCA)), Dr Louie Dartmoor Corpe (Laboratoire de Physique Clermont Auvergne (LPCA))26/02/2025, 11:55
I will present the reinterpretation material of the CalRatio + X ATLAS analysis (arXiv:2407.09183). The analysis focuses on neutral long-lived particles decaying within the ATLAS hadronic calorimeter. The reinterpretation involves a Boosted Decision Tree (BDT) trained on truth-level variables to estimate the probability of events within the ABCD plane and assess the sensitivity of the...
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Martin Habedank (University of Glasgow)26/02/2025, 16:00
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Alejandro Gomez Espinosa (Carnegie-Mellon University (US))26/02/2025, 16:20
This talk will cover the analysis preservation efforts in CMS, including BSM analysis implementations in REANA and possibly experience with HEPData
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Mariel Pettee (Lawrence Berkeley National Lab. (US))26/02/2025, 16:40
Traditional approaches to precise Standard Model (SM) measurements of fundamental particles at the LHC generally restrict the format of these measurements to just one or two properties at a time in predetermined histogram bins. The ATLAS Experiment recently published such a measurement in a notable new format for LHC experiments: high-dimensional and unbinned datasets that can be used for a...
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Tomasz Procter (University of Glasgow (GB))26/02/2025, 17:00
As machine learning becomes increasingly embedded in ATLAS analyses, ensuring the long-term usability of ML-based results poses several challenges. This talk will examine different aspects of ML preservation, including storing and documenting trained models, handling evolving software dependencies, and ensuring accessibility of input features tied to detector conditions. We will discuss the...
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Joshua Hiltbrand (Baylor University (US))26/02/2025, 17:20
This talk summarizes recommendations and status of efforts towards preservation of ML models (and accompanying validation material) in CMS, in particular in view of reuse for BSM (re)interpretations outside the collaboration.
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Michele Selvaggi (CERN)26/02/2025, 17:40
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27/02/2025, 08:55
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Nikita Schmal27/02/2025, 09:00
Global SMEFT analyses combine a vast range of LHC measurements to construct likelihoods to put constraints on physics beyond the Standard Model. However, constructing and evaluating profile likelihoods for such analyses is computationally intensive and prone to instability and noise. We show how modern numerical techniques, similar to neural importance sampling, can dramatically enhance both...
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Christopher Chang27/02/2025, 09:20
Monte Carlo simulations to interpret searches for new physics result in noisy approximate estimators of selection efficiencies and likelihoods. In this talk, I present an exact-approximate MCMC method that returns unbiased exact inferences despite the underlying noisy simulation. I will introduce a Poisson likelihood unbiased estimator and show its behaviour in the context of a search for...
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Volker Andreas Austrup (The University of Manchester (GB))27/02/2025, 09:40
In recent years, LHC experiments are increasingly publishing the full likelihood models for statistical analysis in HEPData. For the purporse of reproducing and reinterpreting such analyses, it is essential to understand the contents of these statistical workspaces. As part of the validation process for an ATLAS combination of searches for Beyond-Standard-Model particles, I have developed an...
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Mark Dayvon Goodsell (Centre National de la Recherche Scientifique (FR))27/02/2025, 10:30
ATLAS and CMS have conducted two pairs of broadly equivalent analyses, and find excesses in all four cases. This consists of searches for soft leptons (originally in supersymmetric models with compressed spectra) and monojets. I will describe recent work on trying to interpret these excesses, and quantify their significance, in terms of both supersymmetric and non-supersymmetric models, and to...
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Martin Habedank (University of Glasgow)27/02/2025, 10:50
The landscape of frameworks for (re)implementing HEP analyses for reinterpretation is, fortunately, diverse. One advantage of this diversity is that multiple reimplementations of the same HEP analysis in different frameworks can be cross-validated. On the downside, statistical combinations of analyses across different frameworks must carefully
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avoid double-counting events, which could... -
Tomasz Procter (Jagiellonian University)27/02/2025, 11:10
Following on from discussions at previous reinterpretation forums on the reinterpretation of ML-based searches; we look at how one of these (ATLAS-SUSY-2018-30) has been used as a test-bed for studies of ML-based reweighting, which can reduce the computational load of studying large parameter spaces. Some new features of YODA 2 which allowed the project to run in Rivet will also be highlighted.
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Joe Egan (University College London)27/02/2025, 11:30
An update on Contur (Contraints On New Theories Using Rivet) developments
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Ahmetcan Sansar (Istanbul University (TR))27/02/2025, 14:00
We present recent developments in the Analysis Description Language (ADL) and the runtime interpreter CutLang in the context of (re)interpretation studies. The talk will cover ongoing validation efforts from LHC BSM analyses and various improvements to the infrastructure to accommodate analysis implementation and validation requirements. We will also present studies using ATLAS open data....
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Are Raklev (University of Oslo (NO))27/02/2025, 14:20
ColliderBit is the GAMBIT module responsible for simulating LHC physics in the GAMBIT global fitting tool. In this talk we will present recent technical developments in ColliderBit, including new LHC analysis implemented, improvements to three-body decay kinematics relevant for supersymmetry searches, as well as updates to interfaces to other codes.
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Krzysztof Rolbiecki (Warsaw University)27/02/2025, 14:40
I will discuss recent developments and new features in CheckMATE, in particular multibin signal regions, new searches using machine learning methods and (perhaps) statistical combination of searches.
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Andre Lessa (CCNH - Univ. Federal do ABC)27/02/2025, 15:00
SModelS is a public tool for fast reinterpretation of LHC searches for new physics based on a large database of simplified model results. Version 3 includes a new framework based on a description of arbitrary simplified model topologies as directed graphs. This new development allows the tool to go beyond Z2-preserving topologies, including results from resonance searches, R-Parity violating...
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Jack Y. Araz (Stony Brook University)27/02/2025, 15:50
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Andy Buckley (University of Glasgow (GB))27/02/2025, 16:10
The Rivet framework is widely used for analysis preservation and Monte Carlo validation, featuring around 2000 analysis routines, and is primarily used in BSM reinterpretation through the measurement-focused Contur method and tool. However, it is much less established in preservation of BSM searches, despite possessing the essential features such as detector "smearing" of physics objects, and...
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Matthew Feickert (University of Wisconsin Madison (US))27/02/2025, 16:30
While advancements in software development practices across particle physics and adoption of Linux container technology have made substantial impact in the ease of replicability and reuse of analysis software stacks, the underlying software environments are still primarily bespoke builds that lack a full manifest to ensure reproducibility across time. The [HEP Packaging...
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27/02/2025, 16:50
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Mr Rameswar Sahu28/02/2025, 09:00
We revisit Gauge Mediated SUSY Breaking (GMSB) scenarios in the context of LHC data. The ATLAS mono-photon search at 139 inverse femtobarn integrated luminosity at the 13 TeV LHC, in the context of a simplified General Gauge Mediation (GGM) scenario (which is a phenomenological version of GMSB with an agnostic approach to the nature of the hidden sector), relies on assumptions that do not hold...
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Kirtiman Ghosh28/02/2025, 09:20
We explore the collider phenomenology of the fat-brane realization of the Minimal Universal Extra Dimension (mUED) model, where Standard Model (SM) fields propagate in a small extra dimension while gravity accesses additional large extra dimensions. This configuration allows for gravity-mediated decay (GMD) of Kaluza-Klein (KK) particles, resulting in unique final states with hard photons,...
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Jayita Lahiri28/02/2025, 09:40
Recasting is an extremely powerful tool to derive limits on new physics models. With so many NP models at our disposal, recasting makes it easy to use the limits derived on certain models by experimental searches, to constrain any model of our choice. However, this method can fail, if the model of our interest not only differs from the one it is being recasted from, in terms of event rates,...
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Andreas Crivellin (University of Zurich (CH))28/02/2025, 10:30
Statistically significant di-photon excess at 95 GeV (>3sigma) and 152 GeV (>4sigma) have been observed. Furthermore, strong tensions exist between the SM predictions and measurements of W and top-like signatures at the LHC. I discuss the status of these anomalies and detail the reinterpretation studies done on the relevant ATLAS searches to assess how the excesses can be related to new...
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Nazila Mahmoudi (CERN and Lyon University (FR))28/02/2025, 10:55
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28/02/2025, 11:20
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Martin Habedank (University of Glasgow), Sabine Kraml (LPSC Grenoble), Sezen Sekmen (Kyungpook National University (KR))28/02/2025, 12:15
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Arpita Mondal (Indian Institute of Technology Patna)
We probe the trilinear R-parity violating (RPV) supersymmetric (SUSY) scenarios with specific non-zero interactions in the light of neutrino oscillation, Higgs, and flavor observables. We attempt to fit the set of observables using a state-of-the-art Markov Chain Monte Carlo (MCMC) set-up and study its impact on the model parameter space. Our main objective is to constrain the trilinear...
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