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Basis for Anomalous Quartic Gauge Couplings
/ Durieux, Gauthier (Louvain U., CP3) ; Remmen, Grant N. (New York U., CCPP) ; Rodd, Nicholas L. (LBL, Berkeley ; UC, Berkeley) ; Éboli, O.J.P. (Sao Paulo U.) ; Gonzalez-Garcia, M.C. (YITP, Stony Brook ; ICREA, Barcelona ; Barcelona, Autonoma U.) ; Kondo, Dan (Tokyo U., IPMU ; Tokyo U., ICRR) ; Murayama, Hitoshi (LBL, Berkeley ; UC, Berkeley ; Tokyo U., IPMU ; Tokyo U., ICRR) ; Okabe, Risshin (Tokyo U., IPMU ; Tokyo U., ICRR)
In this note, we give a definitive basis for the dimension-eight operators leading to quartic - but no cubic - interactions among electroweak gauge bosons. These are often called anomalous quartic gauge couplings, or aQGCs. [...]
CERN-LHCEFTWG-2024-002; CERN-LPCC-2024-002; arXiv:2411.02483.-
Geneva : CERN, 2024 - 8 p.
Fulltext: CERN-LHCEFTWG-2024-002 - PDF; 2411.02483 - PDF; arXiv v1: PDF;
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2.
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Focus topics for the ECFA study on Higgs / Top / EW factories
/ de Blas, Jorge (Granada U.) ; Koppenburg, Patrick (Nikhef, Amsterdam) ; List, Jenny (DESY) ; Maltoni, Fabio (Louvain U.) ; Maestre, Juan Alcaraz (Madrid, CIEMAT) ; Alimena, Juliette (DESY) ; Alison, John (Carnegie Mellon U.) ; Azzi, Patrizia (INFN, Padua) ; Azzurri, Paolo (INFN, Pisa) ; Bagnaschi, Emanuele (CERN ; INFN, Italy) et al.
In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. [...]
arXiv:2401.07564.
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65.
Fulltext
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EFT matching from analyticity and unitarity
/ De Angelis, Stefano (IPhT, Saclay) ; Durieux, Gauthier (CERN)
We present a new on-shell method for the matching of ultraviolet models featuring massive states onto their massless effective field theory. We employ a dispersion relation in the space of complex momentum dilations to capture, in a single variable, the relevant analytic structure of scattering amplitudes at any multiplicity. [...]
arXiv:2308.00035; CERN-TH-2023-150.-
2024-03-12 - 22 p.
- Published in : SciPost Phys. 16 (2024) 071
Fulltext: 2308.00035 - PDF; Publication - PDF;
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Charting the Higgs self-coupling boundaries
/ Durieux, Gauthier (CERN) ; McCullough, Matthew (CERN) ; Salvioni, Ennio (Padua U.)
Could new physics first manifest itself in Higgs self-coupling measurements? In other words, how large could deviations in the Higgs self-coupling be, if other Higgs and electroweak measurements are compatible with Standard Model predictions? Using theoretical arguments supported by concrete models we derive a bound on the ratio of self-coupling to single-Higgs coupling deviations in ultraviolet completions of the Standard Model where parameters are not fine-tuned. Broadly speaking, a one-loop hierarchy is allowed. [...]
arXiv:2209.00666; arXiv:2209.00666; CERN-TH-2022-140.-
2022-12-27 - 24 p.
Fulltext: document - PDF; erratum - PDF; 2209.00666 - PDF;
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6.
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Snowmass White Paper: prospects for the measurement of top-quark couplings
/ Durieux, Gauthier (CERN) ; Camacho, Abel Gutiérrez (Valencia U., IFIC) ; Mantani, Luca (Cambridge U., DAMTP) ; Miralles, Víctor (Valencia U., IFIC ; INFN, Rome) ; López, Marcos Miralles (Valencia U., IFIC) ; Llácer Moreno, María (Valencia U., IFIC) ; Poncelet, René (Cambridge U.) ; Vryonidou, Eleni (Manchester U.) ; Vos, Marcel (Valencia U., IFIC)
In this contribution to the 2021 Snowmass community planning exercise that informs the American strategy for particle physics, we present the prospects for measurements of the top-quark couplings at future colliders. [...]
arXiv:2205.02140.
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35 p.
eConf - Fulltext
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7.
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Theoretical developments in the SMEFT at dimension-8 and beyond
/ Alioli, Simone (INFN, Milan Bicocca) ; Boughezal, Radja (Argonne) ; Cao, Weiguang (Tokyo U., IPMU ; Tokyo U.) ; Chala, Mikael (Granada U., Theor. Phys. Astrophys.) ; Díaz-Carmona, Álvaro (Granada U., Theor. Phys. Astrophys.) ; Bakshi, Supratim Das (Granada U., Theor. Phys. Astrophys.) ; Durieux, Gauthier (CERN) ; Gráf, Lukáš (UC, Berkeley ; UC, San Diego) ; Guedes, Guilherme (Granada U., Theor. Phys. Astrophys.) ; Henning, Brian Quinn (EPFL, Lausanne, LPTP) et al.
In this contribution to the Snowmass 2021 process we review theoretical developments in the Standard Model Effective Field Theory (SMEFT) with a focus on effects at the dimension-8 level and beyond. [...]
arXiv:2203.06771.
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37.
eConf - Fulltext
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Gegenbauer's Twin
/ Durieux, Gauthier (CERN) ; McCullough, Matthew (CERN) ; Salvioni, Ennio (U. Padua, Dept. Phys. Astron. ; INFN, Padua)
In Twin Higgs models the dominant source of fine-tuning is the cancellation of order $v^2/f^2$ required to obtain a Standard Model-like Higgs, where $v$ and $f$ are the electroweak and new physics scales, respectively. Recently proposed Gegenbauer Goldstone models naturally realise $v^2/f^2 \ll 1$ and hence remove this source of fine-tuning. [...]
arXiv:2202.01228; CERN-TH-2022-012.-
2022-05-20 - 7 p.
Fulltext: document - PDF; 2202.01228 - PDF;
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On-shell Higgsing for EFTs
/ Balkin, Reuven (Technion) ; Durieux, Gauthier (CERN) ; Kitahara, Teppei (Nagoya U., ISEE ; KMI, Nagoya) ; Shadmi, Yael (Technion) ; Weiss, Yaniv (Technion)
We study the on-shell version of the Higgs mechanism in effective theories (EFTs) containing particles of different spins, focusing on contact terms as a simple starting point. We derive the massive contact terms and their coefficients from the massless amplitudes of the EFT above the symmetry breaking scale, by covariantizing the massless contact terms under the massive little group. [...]
arXiv:2112.09688; CERN-TH-2021-212.-
2022-03-21 - 41 p.
- Published in : JHEP 2203 (2022) 129
Fulltext: 2112.09688 - PDF; document - PDF;
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