Landscaping CP violating BSM scenarios
Ever wondered how we could uncover new physics beyond the Standard Model? This groundbreaking study explores CP violation at the TeV scale using Effective Field Theory (EFT) to analyze high-energy collider data. Join us as we dive into the world of Higgs production and electroweak interactions! FAQ: Landscaping CP-violating BSM Scenarios 1. What is the motivation for using Effective Field Theory (EFT) in the search for physics beyond the Standard Model (BSM)? The lack of concrete evidence for new particles beyond the Standard Model (BSM) has led to an increased use of EFT methods. These provide a model-independent framework to interpret high energy collider physics results, like those from the Large Hadron Collider (LHC). While many analyses focus on dimension-six operators as leading terms in the EFT expansion, the large number of parameters in this approach often leads to limited sensitivity to specific BSM scenarios. 2. How can EFT analyses be made more sensitive to specific UV completions of the SM? Specific UV scenarios often impose hierarchies among Wilson coefficients (WCs) that reflect the underlying dynamics. By incorporating these hierarchies into the EFT analysis, the number of free parameters can be reduced, leading to enhanced sensitivity and a more streamlined theoretical interpretation. 3. Why is the study focused on CP violation in the gauge-Higgs sector? The research investigates CP-violating (CPV) effective operators arising in the gauge-Higgs sector. This is motivated by the fact that CP violation is a key ingredient for explaining the observed matter-antimatter asymmetry in the universe and that the Higgs boson plays a central role in electroweak symmetry breaking. 4. Why are two heavy vector-like fermions (VLLs) needed to generate CPV operators in the EFT? CPV operators require an odd number of γ5 matrices in the spin traces to generate the Levi-Civita tensor εμνρσ. A single heavy fermion extension of the SM fails to do so. Therefore, at least two heavy VLLs are necessary to achieve this at loop level. 5. What is the role of the QW̃ operator in CP violation, and why is its absence at one-loop matching important? The QW̃ operator is a CPV operator belonging to the X3 class. It is shown to be absent at one-loop matching order in realistic and perturbative extensions of the SM. This absence is crucial because it allows a combined analysis of Higgs and diboson data to constrain the remaining CPV operators at dimension-six, simplifying the EFT interpretation. 6. How do WBF Higgs production and diboson production complement each other in constraining CP violation? WBF Higgs production is sensitive to the CPV operators QHW̃ and QHB̃. Diboson production, particularly the Wγ channel, is mainly sensitive to QHW̃B, which is a blind direction for Higgs data. Combining these processes allows for a more comprehensive constraint on CPV in the electroweak sector. 7. What is the implication of the study for interpreting EFT constraints in specific BSM scenarios? The study emphasizes the importance of considering the hierarchical WC structures expected from specific UV scenarios when interpreting EFT constraints. It provides a framework for translating EFT bounds into relevant model parameter regions, going beyond the limitations of fully marginalized or by-hand zero WC choices. 8. How does the consideration of dimension-eight operators affect the validity of the analysis? The analysis focuses on dimension-six operators and is valid when higher-order deformations are suppressed. The authors acknowledge the need to include dimension-eight contributions in scenarios where they are not negligible. However, they argue that for a range of VLL masses accessible at the LHC, the dimension-six approach remains valid due to the perturbativity of the couplings.
Significance
Section titled “Significance”Understanding these findings helps advance our knowledge and inform better decisions. This research represents an important contribution to the field. For the full details, watch the video above and explore the linked resources.
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