Results 31 to 40 of about 620 (125)
The European Physical Journal C, 2023 AbstractThis document contains lectures on SMEFT, which is an effective field theory of the degrees of freedom of the Standard Model. The material is at a basic, introductory level, without assuming any prior knowledge of effective field theory techniques.
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Flavour symmetries in the SMEFT [PDF]
Journal of High Energy Physics, 2020 Abstract We analyse how U(3)5 and U(2)5 flavour symmetries act on the Standard Model Effective Field Theory, providing an organising principle to classify the large number of dimension-six operators involving fermion fields. A detailed counting of such operators, at different order in the breaking terms of both these symmetries, is presented.
Faroughy, Darius A +3 more
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Towards the ultimate differential SMEFT analysis [PDF]
Journal of High Energy Physics, 2020 Abstract We obtain SMEFT bounds using an approach that utilises the complete multi-dimensional differential information of a process. This approach is based on the fact that at a given EFT order, the full angular distribution in the most important electroweak processes can be expressed as a sum of a fixed number of basis functions.
Banerjee, Shankha +4 more
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Physical Review D, 2022 We study the modular symmetric standard-model effective field theory. We employ the stringy Ansatz on coupling structure that 4-point couplings $y^{(4)}$ of matter fields are written by a product of 3-point couplings $y^{(3)}$ of matter fields, i.e., $y^{(4)} = y^{(3)}y^{(3)}$.
Tatsuo Kobayashi +3 more
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The CKM parameters in the SMEFT [PDF]
Journal of High Energy Physics, 2019 Abstract The extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix from flavour observables can be affected by physics beyond the Standard Model (SM). We provide a general roadmap to take this into account, which we apply to the case of the Standard Model Effective Field Theory (SMEFT).
Descotes-Genon, Sébastien +4 more
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Tree-level UV completions for N R SMEFT d = 6 and d = 7 operators
Journal of High Energy Physics, 2023 We study ultra-violet completions for operators in standard model effective field theory extended with right-handed neutrinos (N R SMEFT). Using a diagrammatic method, we generate systematically lists of possible tree-level completions involving scalars,
Rebeca Beltrán +2 more
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Leading directions in the SMEFT
Journal of High Energy Physics, 2023 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.
Admir Greljo, Ajdin Palavrić
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EWPD in the SMEFT to dimension eight
Journal of High Energy Physics, 2021 We calculate the O H † H 2 / Λ 4 $$ \mathcal{O}\left({\left\langle {H}^{\dagger }H\right\rangle}^2/{\Lambda}^4\right) $$ corrections to LEP electroweak precision data using the geometric formulation of the Standard Model Effective Field Theory (SMEFT ...
Tyler Corbett +3 more
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Top, Higgs, diboson and electroweak fit to the Standard Model effective field theory
Journal of High Energy Physics, 2021 The search for effective field theory deformations of the Standard Model (SM) is a major goal of particle physics that can benefit from a global approach in the framework of the Standard Model Effective Field Theory (SMEFT).
John Ellis +4 more
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, 2022 Effective field theories, like the Standard Model Effective Field Theory (SMEFT), are defined by a chosen field content and a set of symmetries, up to a cut off scale $Λ$. Usually, in order to perform calculations, gauge independent field re-definitions consistent with the symmetries of the theory are then used to redefine the fields.
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