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Top quark decay at next-to-leading order in the Standard Model Effective Field Theory

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arxiv 1907.00997 v2 pith:XRDBBSYD submitted 2019-07-01 hep-ph

Radja Boughezal , Chien-Yi Chen , Frank Petriello , Daniel Wiegand This is my paper · ORCID
classification hep-ph
keywords smeftdecayoperatorsordercalculationdataeffectivefield
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We consider top quark decay in the Standard Model Effective Field Theory (SMEFT). We present a calculation of the total decay width and the $W$-boson helicity fractions at next-to-leading order (NLO) in SMEFT. Our result includes the complete set of contributing four-fermion operators in addition to QCD dipole operators and bottom-mass suppressed effects. We show that operators that first appear at NLO in the SMEFT can be bounded by the current data as well as future data from both a high-luminosity LHC and a potential $e^+e^-$ collider, demonstrating the importance of going beyond leading order when studying the SMEFT. We discuss technical aspects of our calculation that we believe will be useful in future higher-order studies of the SMEFT, in particular the treatment of $\gamma_5$ in loop diagrams.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Precision tests of third-generation four-quark operators: $gg \to h$ and $h \to \gamma \gamma$

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Two-loop SMEFT corrections from third-generation four-quark operators to gg to h and h to gamma gamma are computed with full mass dependence, including new two-loop anomalous dimensions.

  2. Counting b-jets at the FCC-ee as a probe of top-quark flavor physics

    hep-ph 2026-07 accept novelty 5.5 of 10

    FCC-ee at 240 GeV can probe Λ_eff ∼ 7–13 TeV for scalar, vector and tensor eetu/eetc operators by counting b_P-odd single-b-jet multi-jet events.

  3. Flavor physics at the EIC with b-jet tagging

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Single b-jet counting in charged-current events at the EIC could probe new flavor-changing physics up to Λ_eff ≈ 5 TeV, about 30 times the collider energy, assuming tight b-tagging and polarized beams.

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