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Several recent LHC measurements involving top quarks show an intriguing pattern. Electroweak single-top processes such as tWZtWZ and tqγtq\gamma have been measured somewhat above their Standard Model predictions, while measurements involving a Higgs boson also show interesting shifts. At the same time, closely related multiboson processes remain largely Standard-Model-like. These observations are not independent: the…
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This work investigates how the early Universe changed its state as it cooled down. Such phase transitions are important because they could help explain why the Universe contains more matter than antimatter, and they might also have produced gravitational waves that future experiments could observe. Most existing calculations describe these transitions using perturbative methods –…
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Our paper investigates a long-standing puzzle in particle physics: certain decays of B mesons occur at rates that significantly disagree with precise theoretical predictions. These decays are considered especially clean, meaning they should be well understood. Therefore, the discrepancy is surprising and could potentially point to new physics beyond the Standard Model. One possible explanation…
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In this work, we develop and explore a new way to search for undiscovered particles at the Large Hadron Collider. Traditionally, one looks for “bumps” in data. These small and local excesses of events at a particular energy signal the presence of a new particle if the excess is statistically significant. However, in many well-motivated…
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Perturbative quantum field theory typically alternates between diagrammatic calculations and functional approaches, which are elegant but can obscure physical quantities like anomalous dimensions. This work revisits that balance using the background field method combined with the heat-kernel expansion, asking whether renormalisation-group information can be extracted without reverting to Feynman diagrams. The key point is that…
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Neutrinos are a standard candles in the search for new physics beyond the Standard Model. This work revisits one of the ‘classic’ explanations for tiny neutrino masses: the so-called type-II seesaw model. In this framework, the Standard Model is extended by an additional Higgs-like field with non-SM quantum numbers. A striking prediction is a doubly…
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The Higgs boson, discovered in 2012, is crucial for maintaining mathematical consistency in particle interactions at high energies. But if the Higgs does not interact exactly as the Standard Model predicts, new particles must appear to “fix” this consistency, a principle called unitarity restoration. The paper “Weak boson probes of Higgs unitarity restoration at 10 TeV…
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Physicists often use simplified models to describe possible new particles or forces, especially when experiments like the Large Hadron Collider have not yet revealed clear signs of new physics. One such framework is the “Higgs Effective Field Theory” (HEFT), which extends the Standard Model by allowing the Higgs boson to behave more flexibly than the Standard…
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“Future Collider Perspectives on Higgs CP Violation” investigates how upcoming collider facilities can advance the search for new sources of Charge Conjugation and Parity (CP) violation. This is a crucial ingredient for explaining the observed matter–antimatter asymmetry in the universe, and our best theory so far, the Standard Model, does not provide enough CP violation to…
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“Phenomenology of a kinetic Higgs portal” investigates non-minimal Higgs portal interactions, focusing on momentum-dependent couplings between the Standard Model Higgs and a hidden scalar sector. Such “kinetic portals” naturally emerge in effective field theory frameworks and differ from the minimal, renormalisable Higgs portal by introducing non-decoupling effects, e.g. from strong interactions. We analyse collider implications,…
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