Results 31 to 40 of about 1,160 (154)
A global analysis of axion-like particle interactions using SMEFT fits
Journal of High Energy Physics, 2023 In the presence of axions or axion-like particles (ALPs) that couple to the Standard Model via dimension-five interactions, dimension-six SMEFT interactions are generated via renormalization-group evolution.
Anke Biekötter +3 more
doaj +1 more source
SMEFT calculations for the LHC [PDF]
Proceedings of The Ninth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2021), 2021 This talk summarizes the status of calculations in the Standard Model Effective Field Theory and gives an overview of the computational techniques that are most commonly employed in order to make predictions for LHC processes in this framework.
openaire +2 more sources
The rise of SMEFT on-shell amplitudes [PDF]
Journal of High Energy Physics, 2019 Abstract We present a map between the tree-level Standard Model Effective Theory (SMEFT) in the Warsaw basis and massive on-shell amplitudes. As a first step, we focus on the electroweak sector without fermions. We describe the Feynman rules for a particular choice of input scheme and compare them with the 3-point massive ...
Rafael Aoude, Camila S. Machado
openaire +3 more sources
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
openaire +3 more sources
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
doaj +1 more source
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
openaire +3 more sources
The importance of flavor in SMEFT Electroweak Precision Fits
Journal of High Energy Physics, 2023 Effective field theory tools are essential for exploring non-Standard Model physics at the LHC in the absence of the discovery of new light particles.
Luigi Bellafronte +2 more
doaj +1 more source
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
doaj +1 more source
Field reparametrization in SMEFT [PDF]
The European Physical Journal Plus, 2017 Debate topic for effective field theory (EFT) is the choice of a “basis” for ${\rm dim}= 6$ operators. Clearly all bases are equivalent as long as they are a “basis”, containing a minimal set of operators ...
openaire +2 more sources
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
doaj +1 more source