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Theory uncertainties of the irreducible background to VBF Higgs production
No full textHiggs boson production through gluon fusion in association with two jets is an irreducible background to Higgs boson production through vector boson fusion, one of the most important channels for analyzing and understanding the Higgs boson properties at the Large Hadron Collider. Despite a range of available simulation tools, precise predictions for the corresponding final states are notoriously hard to achieve. Using state-of-the-art fixed-order calculations as the baseline for a comparison, we perform a detailed study of similarities and differences in existing event generators. We provide consistent setups for the simulations that can be used to obtain identical parametric precision in various programs used by experiments. We find that NLO calculations for the two-jet final state are essential to achieve reliable predictions
The ATLAS simulation R&D programme for Run 4
No full textThe High Luminosity phase of the Large Hadron Collider is bringing much higher data rates, requiring large datasets of Monte Carlo simulated samples. As computing resources are not expected to scale with the increased requirements, optimisations and new developments are needed. This document outlines the ATLAS experiments simulation R&D programme for Run 4
Move more, eat better campaign
No full textAnthony Garnier, Physical trainer/Préparateur physique du Genève Servette Football clu
Open Science Fair 2025
No full textThe EU-funded OSTrails project is building a federated Open Science infrastructure by enabling researchers and institutions to discover, plan, track, and assess their work in transparent and interoperable ways. With 41 partners and 25 pilots—including cross-domain, national, and Horizon Europe testbeds—OSTrails is piloting the practical integration of over 80 interoperable tools and services. This diversity reflects the scale needed to support a truly federated Open Science ecosystem.
At the core of the project are two key enablers: a modular Interoperability Reference Architecture and a tool independent Plan-Track-Assess (PTA) framework. Together, these provide a shared foundation for aligning diverse research management services—from Data Management Planning platforms to Scientific Knowledge Graphs and FAIR assessment tools—across distributed infrastructures.
To ensure long-term impact, OSTrails has launched a comprehensive training and capacity-building programme, equipping research communities and service providers with the knowledge and tools to adopt and extend project outcomes. These efforts build on the co-designed pilots, which validate interoperability across varied institutional, disciplinary settings.
For researchers, OSTrails simplifies cross-institutional Research Data Management workflows and clarifies pathways to Open Science best practices. For service providers, it offers a practical model for aligning with EOSC while retaining domain-specific autonomy.
This presentation will showcase how OSTrails contributes to a federated EOSC ecosystem by delivering standards-driven solutions that prioritise interoperability and FAIRness as essential components of a sustainable and inclusive infrastructure, supporting both federation and the development of the Web of FAIR Data and Services
Open Science Fair 2025
No full textWhat’s driving Open Science forward, and what’s holding it back? This invited panel brings together policy experts to unpack the major shifts, challenges, and opportunities shaping Open Science today. Join us for a lively discussion on aligning agendas, empowering institutions, and ensuring that Open Science policies are equitable, inclusive, and globally impactful.
This invited panel will be a forum to discuss the current policy landscape for Open Science. After a short introduction of the panelists and their involvement in open science, we hope to create a dynamic and engaging session around the following topics.
Key topics of this panel session will include:
1. What are the major policy shifts currently driving (or hindering) Open Science implementation?
2. How can national and international policy agendas better align to support a cohesive Open Science landscape?
3. What roles do public institutions, funders, and governments play in fostering openness and collaboration in research?
4. How can we ensure that Open Science policies are equitable, inclusive, and globally relevant
Coherently enhanced decoherence and cloud substructure of atom interferometers
No full textWe study how coherent scattering of a background gas off an atom (or other matter) interferometer can lead to enhanced signals from phase shifts and contrast loss. We focus on the inclusion of realistic features of atom interferometers such as finite temperature, cloud substructure, and time-dependent cloud radii. The inclusion of these effects, extending beyond the previously considered point-like cloud approximation, naturally allow us to study the smooth transition between the coherent and incoherent scattering regimes. We discuss how the formalism presented herein can be tested in the lab (with near-infrared photons or an eV-scale electron gun), and discuss an application for the detection of dark matter interacting via long-range forces
Future Circular Collider: A Physics Manifesto
No full textAbstract:
The Future Circular Collider is profiling itself as the next flagship project at CERN. Its ambitious program would be a unique opportunity to fuel the field of high-energy physics for several decades to come. Be it for testing the standard model predictions with unprecedented precision or to search directly and indirectly for new particles at high and low scales, this machine is being designed with versatility and diversity at the heart of its multi-stage program. This presentation will aim at providing a snapshot at the current state of affairs upon the completion of the feasibility study in March 2025 and before the release of recommendations of the European Strategy for Particle Physics Update expected in early 2026. Emphasis will be given on the physics case of the FCC-ee early stage and the complementarity with the FCC-hh later stage will be illustrated on some concrete examples.
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A model-independent measurement of the CKM angle in the decays and ()
No full textA model-independent determination of the CKM angle is presented, using the and decays, with . This measurement is the first phase-space-binned study of these decay modes, and uses a sample of proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of fb. The phase-space bins are optimised for sensitivity to , and in each bin external inputs from the BESIII experiment are used to constrain the charm strong-phase parameters. The result of this binned analysis is , where the uncertainty includes both statistical and systematic contributions. Furthermore, when combining with existing phase-space-integrated measurements of the same decay modes, a value of is obtained, which is one of the most precise determinations of to dateA model-independent determination of the CKM angle is presented, using the and decays, with . This measurement is the first phase-space-binned study of these decay modes, and uses a sample of proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of fb. The phase-space bins are optimised for sensitivity to , and in each bin external inputs from the BESIII experiment are used to constrain the charm strong-phase parameters. The result of this binned analysis is , where the uncertainty includes both statistical and systematic contributions. Furthermore, when combining with existing phase-space-integrated measurements of the same decay modes, a value of is obtained, which is one of the most precise determinations of to date