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9th General Meeting of the LHC EFT Working Group

1–3 Dec 2025
CERN
Europe/Zurich timezone

Session

HEFT & two-loop SMEFT

2 Dec 2025, 09:00
4/3-006 - TH Conference Room (CERN)

4/3-006 - TH Conference Room

CERN

110
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Conveners

HEFT & two-loop SMEFT

  • Alejo Nahuel Rossia (University of Padua and INFN Sezione di Padova)

Presentation materials

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  1. 5. The Art of Counting: where to cut-off SMEFT and HEFT in Higgs Pair Production
    Konstantin Schmid (University and INFN Padova)
    02/12/2025, 09:00

    In searches for beyond the Standard Model (BSM) Physics, bottom-up effective field theories (EFTs) such as the Standard Model EFT (SMEFT) and Higgs EFT (HEFT) have become crucial theoretical tools. Besides specifying their particle content and the respective symmetries on which the higher-dimensional operators are built, the choice of a power counting in a small parameter is the third...

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  2. 11. (Remote) The Potential of HEFT and the scale of New Physics
    Susobhan Chattopadhyay (Tata Institute of Fundamental Research (TIFR), Mumbai)
    02/12/2025, 09:25

    We consider a scalar theory with an $(N_{GB} + 1)$-plet undergoing spontaneous symmetry breaking $SO(N_{GB} + 1) \to SO(N_{GB})$, with interactions governed by a general potential $V$. Using geometric methods, we compute the high-energy leading term of all scattering amplitudes involving arbitrary numbers of Higgs-like and Goldstone bosons. This infinite set of amplitudes allows us to derive...

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  3. 2. Two-loop running in the SMEFT at dimension-six
    Lukas Born
    02/12/2025, 09:50

    The Standard Model Effective Field Theory (SMEFT) provides a powerful framework for parameterizing potential new physics in a model-independent way. To analyze data from experiments across different energy scales and to reliably extrapolate ultraviolet (UV) physics effects, it is crucial to know the renormalization group evolution (RGE) of SMEFT operators.

    In this talk, I will present the...

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  4. 7. Two loop running effects in the Higgs gluon coupling
    Barbara Anna Erdelyi (Università degli Studi di Padova and INFN Sezione di Padova)
    02/12/2025, 10:15

    In this work we extend the existing literature on two-loop renormalisation group equations (RGEs) for the dimension-six Standard Model Effective Field Theory operator involving two gluons and two Higgs bosons. This operator generates an effective coupling between the Higgs boson and gluons. In particular, we extend and complete the contributions that enter the RGEs proportionally to $g_s^2...

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