Publications

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TOP2024: an overview of experimental results

Abideh Jafari

SciPost Phys. Proc. 18, 029 (2026) · published 29 January 2026 | · pdf

The $17^\text{th}$ edition of the international workshop on top quark physics featured a diverse set of outstanding results. This note is an attempt to summarize the workshop from the experimental perspective and suggest ways forward for the future investigations. As it has not been possible to touch upon every single physics analysis in this note, interested reader are referred to individual proceedings for details.
On electroweak metastability and Higgs inflation

Isabella Masina, Mariano Quiros

SciPost Phys. Proc. 18, 028 (2026) · published 29 January 2026 | · pdf

For the central values of the relevant experimental inputs, that is the strong coupling constant and the top quark and Higgs masses, the effective Higgs potential displays two minima, one at the electroweak scale and a deeper one at high energies. We review the phenomenology of the Higgs inflation model, extending the Standard Model to include a non-minimal coupling to gravity; as recently shown, even configurations that would be metastable in the Standard Model, become viable for inflation if the non-minimal coupling is large enough to flatten the Higgs potential at field values below the barrier between the minima.
Stability of the Higgs potential in the Standard Model and beyond

Tom Steudtner

SciPost Phys. Proc. 18, 027 (2026) · published 29 January 2026 | · pdf

The question of stability of the Higgs potential in the Standard Model is revisited employing advanced theoretical precision and recent experimental results. We show that the top mass and strong coupling constants are key observables in order to reach or refute absolute stability. We highlight new physics scenarios that lead to a decisive stabilisation of the Higgs sector. These proceedings summarise findings first reported in [G. Hiller et al., Phys. Rev. D 106, 115004 (2022); Phys. Rev. D 110, 115017 (2024)].
ATLAS EFT results in the top quark sector

Dongwon Kim, on behalf of the ATLAS collaboration

SciPost Phys. Proc. 18, 026 (2026) · published 29 January 2026 | · pdf

With no evidence of direct production of beyond the Standard Model (BSM) particles at the TeV scale, deviations from the Standard Model (SM) can be explored systematically through Effective Field Theories (EFTs) such as the Standard Model EFT (SMEFT). The SMEFT, a framework for probing BSM effects, extends the SM by introducing higher-dimensional operators parameterized by Wilson coefficients. This contribution highlights three recent analyses using the ATLAS Run-2 dataset at a center-of-mass energy of $\sqrt{s}$ = 13 TeV with an integrated luminosity of 140 $\text{fb}^{-1}$. Combined measurements enhance sensitivity to Wilson coefficients, exploring the potential of SMEFT in the top quark sector.
Combined EFT interpretation of top quark, Higgs boson, electroweak and QCD measurements at CMS

Niels Van den Bossche, on behalf of the CMS collaboration

SciPost Phys. Proc. 18, 025 (2026) · published 29 January 2026 | · pdf

A recent EFT result from CMS is presented, combining differential cross section and direct EFT measurements performed by the CMS Collaboration across four branches of the Standard Model: top, Higgs, electroweak and QCD physics. To maximize the sensitivity, measurements of electroweak precision observables from LEP and SLC are included as well. 64 Wilson Coefficients (WC) are targeted in this combined measurement, both individually and with a simultaneous fit to 42 linear combinations of the Wilson Coefficients.
Searches for top-associated dark matter production at the LHC

Dominic Stafford, on behalf of the ATLAS and CMS collaborations

SciPost Phys. Proc. 18, 024 (2026) · published 29 January 2026 | · pdf

Recent searches for dark matter (DM) produced in association with top quarks from the ATLAS and CMS experiments using data collected between 2015 and 2018 are presented. These comprise searches from both experiments for DM in association with a single top quark; an improved ATLAS search for DM in single lepton $t\bar{t}$ final states; an ATLAS search for stop squarks decaying to a top quark, a charm quark and neutralinos; and a CMS search for DM produced in association with a pair of top quarks or a single top. These analyses feature novel machine learning and advanced background estimation techniques. No statistically significant excess is observed in any of these searches.
Constraining the SMEFT at present and future colliders

Eugenia Celada

SciPost Phys. Proc. 18, 023 (2026) · published 29 January 2026 | · pdf

We present results from SMEFiT3.0, a global SMEFT fit of Higgs, top quark, and diboson production data from the LHC. Our updated analysis includes recent inclusive and differential measurements from the LHC Run II, together with the exact implementation of electroweak precision observables (EWPOs) from LEP and SLD. We then analyse the impact of HL-LHC measurements by adding to SMEFiT3.0 the projections obtained by extrapolating from Run II data. Finally we estimate the potential of two proposed high-energy circular $e^+e^-$ colliders, the FCC-ee and the CEPC, in further improving the bounds on the SMEFT parameters.
Top observables as precise probes of the ALP

Anh Vu Phan

SciPost Phys. Proc. 18, 022 (2026) · published 29 January 2026 | · pdf

Measurements of the top quark by the ATLAS and CMS experiments go beyond testing the Standard Model (SM) with high precision. Axion-like particles (ALPs), a potential SM extension involving new pseudoscalar particles, exhibit strong interactions with heavy SM fermions. Consequently, they can significantly affect the kinematic distributions of top quarks in top-antitop pair production. Moreover, such strong interactions can induce other ALP couplings at low energies, leading to a rich phenomenology. We summarize recent developments in probing the ALP-top coupling and use LHC data from run 2 to constrain the ALP parameter space.
Proposal for simplified template cross-sections extension using $\mathcal{CP}$ observables in $t\overline{t}H$

Carnelli Alberto

SciPost Phys. Proc. 18, 021 (2026) · published 29 January 2026 | · pdf

The Large Hadron Collider (LHC) offers a unique opportunity to investigate $\mathcal{CP}$ violation in the Yukawa coupling between the Higgs boson and the top quark by studying Higgs production in association with top quarks; this is of fundamental importance, seeing that the $\mathcal{CP}$ properties of the Higgs boson are yet to measure with high precision. To address this, the focus of this work has been an extension of the simplified template cross-section (STXS) framework, devised to be sensitive to $\mathcal{CP}$ effects. Our study focused on $\mathcal{CP}$-sensitive observables across multiple Higgs decay channels, comparing their performances. The result indicates that the most efficient extension of the current binning used in the STXS framework, which currently uses the Higgs boson's transverse momentum $p_{T,H}$, requires adding one further split using $\mathcal{CP}$-sensitive observables. Between these observables, one of the best is the Collins-Soper angle $|\cos\theta^*|$, a variable derived from momenta information of the top quarks. We have investigated the improvement brought by our two-dimensional STXS setup and compared it to the currently employed methodologies, finding an increase in performances at an integrated luminosity of $300 \mathrm{ fb}^{-1}$. Moreover, our results highlight that this advantage seems to be present also at $3000 \mathrm{ fb}^{-1}$.
Search for heavy scalar or pseudoscalar states in $\mathrm{t \bar{t}}$ events at CMS

Laurids Jeppe, on behalf of the CMS collaboration

SciPost Phys. Proc. 18, 020 (2026) · published 29 January 2026 | · pdf

A search for scalar or pseudoscalar states decaying to a top quark-antiquark pair ($\mathrm{t \bar{t}}$), using $138 \mathrm{ fb}^{-1}$ of pp collision data taken at $\sqrt{s} = 13 \mathrm{ TeV}$ using the CMS detector, is presented. Events with one or two leptons are analyzed using the invariant $\mathrm{t \bar{t}}$ mass ($m_{\mathrm{t \bar{t}}}$) as well as angular and spin correlation observables. An excess in the data is observed for low values of $m_{\mathrm{t \bar{t}}}$, preferring a pseudoscalar over a scalar hypothesis. It is interpreted in terms of a generic model of (pseudo)scalar boson production, as well as a simplified model of a $\mathrm{t \bar{t}}$ bound state ($\eta_{\mathrm{t}}$), yielding good agreement with the data. Moreover, limits on the couplings of additional (pseudo)scalar bosons to top quarks are set.

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