Universal Scalar Leptoquark Action for Matching

Abstract

In this study we present a universal effective action for one-loop matching of all scalar leptoquarks. We use both the Universal One-Loop Effective Action (UOLEA) and covariant diagrams to evaluate the Wilson coefficients directly in the Green basis for up-to dimension-6 operators. On the technical side, we use the newly developed method of evaluating supertraces, to further validate the results stemming from the use of covariant diagrams. As an application, we perform a fully functional matching onto Standard Model Effective Field Theory (SMEFT) of a model with two scalar leptoquark fields: a weak isospin singlet and a doublet. We demonstrate its use by calculating several observables, such as lepton magnetic and electric dipole moments, neutrino masses, proton decay rate, while we comment upon fine tuning issues in this model. Apart from its phenomenological interest, this model generates the majority of dimension-6 operators and provides an EFT benchmark towards future matching automation.

69 pages, v2: references added, v3: few sign errors and typos corrected, refs added, version matches JHEP publication

References in corpus (18)

• Extending the Standard Model Effective Field Theory with the Complete Set of Dimension-7 Operators
• New physics explanations of $a_{\mu }$ in light of the FNAL muon $g-2$ measurement
• Search for Proton Decay via $p\to e^{+}{\pi }^0$ and $p\to {\mu }^{+}{\pi }^0$ in 0.31 megaton$\cdot$years exposure of the Super-Kamiokande Water Cherenkov Detector
• On the single leptoquark solutions to the $B$-physics anomalies
• Integrating out heavy particles with functional methods: a simplified framework
• Extending the Universal One-Loop Effective Action: Heavy-Light Coefficients
• Consequences of chirally enhanced explanations of $(g-2{)}_{\mu }$ for $h\to \mu \mu$ and $Z\to \mu \mu$
• Effective field theory interpretation of lepton magnetic and electric dipole moments
• Inclusive Nucleon Decay Searches as a Frontier of Baryon Number Violation
• STrEAMlining EFT Matching
• Seesaw mechanism in the sneutrino sector and its consequences
• Functional Prescription for EFT Matching
• SuperTracer: A Calculator of Functional Supertraces for One-Loop EFT Matching
• Radiative neutrino masses, lepton flavor mixing and muon $g-2$ in a leptoquark model
• Complete Lagrangian and Set of Feynman Rules for Scalar Leptoquarks
• Classifying Standard Model Extensions Effectively with Precision Observables
• Scalar Leptoquarks, Baryon Number Violation and Pati-Salam Symmetry
• Proton decay at 1-loop

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• A Proof of Concept for Matchete: An Automated Tool for Matching Effective Theories
• Evanescent Operators in One-Loop Matching Computations
• Neutrino seesaw models at one-loop matching: Discrimination by effective operators
• Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables
• Effective comparison of neutrino-mass models
• EFT Diagrammatica II: Tracing the UV origin of bosonic D6 CPV and D8 SMEFT operators
• Flavour alignment of New Physics in light of the $(g-2{)}_{\mu }$ anomaly
• Constraints on leptoquarks from lepton-flavour-violating tau-lepton processes
• One-loop Matching of Scotogenic Model onto Standard Model Effective Field Theory up to Dimension 7
• Effective Field Theory of Chirally-Enhanced Muon Mass and Dipole Operators