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Leading directions in the SMEFT
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abstract
Short-distance new physics at (or slightly) above the TeV scale should not excessively violate the approximate flavor symmetries of the SM in order to comply with stringent constraints from flavor-changing neutral currents. In this respect, flavor symmetries provide an effective organizing principle for the vast parameter space of the SMEFT. In this work, we classify all possible irreducible representations under $U(3)^5$ flavor symmetry of new heavy spin-0, 1/2, and 1 fields which integrate out to dimension-6 operators at the tree level. For a general perturbative UV model, the resulting flavor-symmetric interactions are very restrictive and, in most cases, predict a single Hermitian operator with a definite sign. These leading directions in the SMEFT space deserve particular attention. We derive an extensive set of present experimental constraints by utilizing the existing global SMEFT fits, which incorporate data from top quark, Higgs boson, and electroweak measurements, along with constraints on dilepton and 4-lepton contact interactions. The derived set of bounds comprehensively summarises the present knowledge from indirect searches of flavor-blind new physics mediators.
Forward citations
Cited by 4 Pith papers
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A Guide to Functional Methods Beyond One-Loop Order
Functional methods are generalized to two-loop EFT matching and running with manifest gauge covariance, and the hard-region matching formula is proven to all loop orders.
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Tailored PDFs for New Physics searches
Using closure tests with W', Z', and coloron models, the paper shows that either excluding high-energy data or fitting PDFs jointly with SMEFT coefficients prevents new-physics signals from being absorbed into the pro...
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Connecting $t$-channel Dark Matter Models to the Standard Model Effective Field Theory
One-loop SMEFT Wilson coefficients for leptophilic t-channel dark matter, combined with global fits, exclude large coupling regions, especially C_ell_ell for doublet mediators and C_ed above 3 TeV.
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Fingerprinting New Physics with Effective Field Theories
A thesis compiling published SMEFT global fits, automated UV-model constraints, and ML-based unbinned observables, with projections for HL-LHC, FCC-ee, and CEPC.
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