Archivio della ricerca - Fondazione Bruno Kessler
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Search for displaced leptons in √s =13 TeV and 13.6 TeV pp collisions with the ATLAS detector
No full textA search for leptons displaced from the primary vertex is performed with the ATLAS detector at the Large Hadron Collider. The search includes the full proton-proton collision dataset collected during Run 2 at √s =13 TeV and a partial dataset collected during Run 3 in 2022–2023 at √s =13.6 TeV, corresponding to integrated luminosities of 140 fb−1 and 56.3 fb−1, respectively. Final states with displaced electrons or muons are considered, and novel triggers introduced in Run 3 are employed that use large impact parameter tracking to reconstruct displaced tracks with low momentum. In addition, photon reconstruction and multivariate techniques are employed to broaden the sensitivity to channels with large background rates or highly displaced electrons, respectively. The results are consistent with the Standard Model background expectations and are used to set model-independent limits on the production of displaced electrons and muons. The analysis is also interpreted in the context of a gauge-mediated supersymmetry breaking model with pair-produced long-lived sleptons and a dark sector model with pair-produced chargino-like states. The results include 95% confidence level exclusions of selectrons with lifetimes from 4 ps to 60 ns and a mass of 150 GeV, and exclusions of selectrons, smuons, and staus with a lifetime of 0.3 ns for masses up to 740, 830, and 440 GeV, respectively. Dark charginos with masses up to 380 GeV are excluded for a mass difference with the neutral state of 40 GeV, and mass differences down to 17 GeV are excluded for dark charginos with a 100 GeV mass
A New Measurement of Light Yield Quenching in EJ-200 and LYSO Scintillators
No full textLutetium–Yttrium Oxyorthosilicate (LYSO) crystals and EJ-200 plastic scintillators are widely recognized fast scintillating materials, valued for their high light yield and mechanical robustness, which make them well suited for demanding applications in high-energy physics and space research. Their non-proportional light response, along with their non-linear behavior at low-energy X-rays, has been extensively investigated in previous studies, revealing potential systematic effects in existing measurements. In this work, light quenching in both scintillators is measured under charged-particle excitation. The results are interpreted using the modified Birks–Onsager model, which provides a theoretical framework for understanding the underlying quenching mechanisms, as well as a generalized logistic parametrization, offering experimentalists a useful tool to characterize the detector’s light yield and associated uncertainties
Co-Registration Analysis of Coherent Multitemporal Radargrams
No full textRadar Sounder data provide insights into subsurface geology and are typically analyzed using automatic techniques on single-pass acquisitions. A few preliminary studies have explored multitemporal RS data from the cryosphere. However, challenges related to data co-registration exist because of the acquisition geometry and the characteristics of the targets. This paper examines co-registration accuracy in overlapping bi-temporal RS acquisitions co-registered with coherent and non-coherent approaches to evaluate the importance of the phase signal. We project and co-register overlapping radargram pairs to mitigate the horizontal changes related to the ice motion and vertical variations in mass balance. We used the log ratio to compare the co-registered data and highlight backscattering differences in the radargrams due to residual misregistration (and morphological changes). We analyze overlapping radargram pairs acquired in Antarctica in 2014 and 2016
All’origine. I mercanti di legname a Perarolo in età moderna
Get PDFIl saggio indaga la vicenda storica delle attività commerciali di Perarolo di Cadore, che deve la sua origine e il suo sviluppo al commercio del legname. Posta alla confluenza del torrente Boite nel Piave, da dove era possibile la navigazione del legname sulle zattere, fin dal Quattrocento la comunità è stata condizionata dalla crescita della domanda di questa risorsa, così essenziale oggi e ancor più ieri, il cui centro principale dei consumi era Venezia. La costruzione a monte dell’abitato dei ‘cidoli’ – sbarramenti artificiali dei corsi d’acqua che servivano ad ammassare e regolare il deflusso dei tronchi – rese Perarolo uno dei primi scali commerciali del legname in area veneta per almeno quattro secoli
From Waste to Worth: Integrating a Double-Effect Heat Pump in a Pharmaceutical Industry for Process Cooling & District Heating
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From Policy to Reality: Harnessing Data Spaces for Sustainable Urban Development
No full textThe proliferation of detailed data—from satellite observations and sensors to Internet of Things and administrative registries— combined with the widespread adoption of analytical tools is reshaping how we understand and respond to ‘grand’ societal challenges. Climate change is one such challenge, and the European Union has committed through a suite of strategies and measures to becoming climate neutral by 2050 while adapting to environmental shifts already underway. Central to this effort is the recognition of data as a strategic asset. Building a single market for data is expected to unlock social and economic benefits, while supporting the ambitions of the European Green Deal. Cities are at the forefront of this green and digital transition. Cities are mandated with direct service provision and implementation of European Union policies and regulations. Moreover, climate change is felt even more intensively in urban areas due to their morphology, density in population and built-up systems. In the past decades, cities achieved considerable progress in promoting innovative strategies to address environmental concerns, for instance, through the Covenant of Mayors1 initiative. Yet cities have been grappling with leveraging data into policymaking. Despite numerous initiatives to promote data-driven transformation, often, whole-of-system approaches are still lacking. Besides patchy or unavailable data governance frameworks, cities face challenges related to data availability, quality and interoperability. The European Union has mobilised with regulatory frameworks, standardisation efforts and research initiatives to encourage secure, trusted data sharing and use. Cities can tap into valuable resources including collaboration across European cities, exchange knowledge with key stakeholders, access funding and research to deploy context-based, sustainable solutions. Within the evolving landscape of data collaborations and technical solutions, data spaces are emerging as a promising model for facilitating collaboration across sectors and enabling data to be shared and reused in alignment with common policy goals. This policy brief explores two complementary approaches or frameworks for data sharing and use that enable the collaboration between city-relevant stakeholders in the realm of environmental sustainability. Drawing on the examples of two projects outlined further–USAGE and SPOTTED–we aim to understand how technical arrangements and governance mechanisms can harness the potential of data integration to drive environmentally sustainable solutions. Together, these perspectives offer actionable insights for city leaders and policymakers seeking to translate data into tangible climate action. The brief concludes with recommendations grounded in real-world pilot experiences
Search for Dark Matter Produced in Association with a Dark Higgs Boson in the b ̄b Final State Using pp Collisions at √s=13 TeV with the ATLAS Detector
No full textA search is performed for dark matter particles produced in association with a resonantly produced pair of b-quarks with 30<150 GeV using 140 fb^{-1} of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. This signature is expected in extensions of the standard model predicting the production of dark matter particles, in particular those containing a dark Higgs boson s that decays into bb[over ̄]. The highly boosted s→bb[over ̄] topology is reconstructed using jet reclustering and a new identification algorithm. This search places stringent constraints across regions of the dark Higgs model parameter space that satisfy the observed relic density, excluding dark Higgs bosons with masses between 30 and 150 GeV in benchmark scenarios with Z^{'} mediator masses up to 4.8 TeV at 95% confidence level
IGARSS 2025 in Brisbane, Australia: Impressions of the First Days
No full textProvides society information that may include news, reviews or technical notes that should be of interest to practitioners and researchers