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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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“Gauge Choices, Infrared Pitfalls, and Thermal Effects in Effective Potentials” tackles a longstanding issue of gauge dependence and infrared (IR) divergences in one-loop effective potentials. These are crucial for applications such as inflation, vacuum stability, and phase transitions. It is shown how the multiplicative anomaly which arises from the non-factorisation of elliptic operators in Fermi gauge,
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“Harnessing Higgs Kinematics for HEFT Constraints” explores how future Large Hadron Collider (LHC) data can reveal subtle signs of new physics in Higgs boson pair production. We employ a theoretical framework called the Higgs Effective Field Theory (HEFT), which allows for more flexible and momentum-sensitive modifications to Higgs interactions than the more standard Standard Model-based
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“Z and Higgs Factory Implications of Two Higgs Doublets with First-Order Phase Transitions” investigates the potential of future electron–positron colliders to probe a specific Higgs sector extension (the so-called two-Higgs-doublet model) that can support a strong first-order electroweak phase transition. This is a key ingredient for electroweak baryogenesis, which is a possible explanation of the
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In “A B-anomaly motivated Z′ boson at the energy and precision frontiers”, we perform an in-depth analysis of a specific Z’ boson model (a stipulated heavy sibling of the Z boson of the SM), which could explain anomalies that are currently observed in B-meson decays. We analyse the potential for discovering this Z’ boson at
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In “Distorting the Top Resonance with Effective Interactions”, we examine how interference effects in effective field theory (EFT) analyses can alter the expected sensitivity in top-quark pair production at the LHC. The focus is on four-fermion operators, and we assess how these interactions distort (Breit-Wigner) resonance shapes, leading to potential conflicts in reconstruction techniques applied to
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In “Electroweak Scalar Effects Beyond Dimension-6 in SMEFT” we explore the impact of heavy scalar fields on the Standard Model Effective Field Theory (SMEFT) by computing effective dimension-eight operators. Focusing on the Two Higgs Doublet Model and the Complex Triplet Scalar Model, we ‘integrate out’ heavy scalar fields at one-loop order in the so-called Green’s
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In our recent paper “Impact of New Physics on Momentum-Dependent Particle Widths and Propagators” we investigate how momentum-dependent widths and propagators influence gauge and Higgs bosons, along with the top quark, within the Standard Model (SM) and its SMEFT (Standard Model Effective Field Theory) extensions. We analyse these effects using perturbative resummation techniques. A notable finding is
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