Results 41 to 50 of about 4,206 (182)
Can New Physics hide inside the proton? [PDF]
, 2019 Modern global analyses of the structure of the proton include collider measurements which probe energies well above the electroweak scale. While these provide powerful constraints on the parton distribution functions (PDFs), they are also sensitive to ...
Carrazza, Stefano +4 more
core +3 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
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Dimension-8 Operators in the Standard Model Effective Field Theory
, 2021 We present a complete basis of dimension-8 operators in the Standard Model Effective Field Theory. Attention is paid to operators that vanish in the absence of flavor structure. The 44,807 operators are encoded in 1,029 Lagrangian terms.
Murphy, Christopher W.
core +1 more source
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
Scheming in the SMEFT... and a reparameterization invariance! [PDF]
, 2017 We explain a reparameterization invariance in the Standard Model Effective Field Theory present when considering $\bar{\psi} \psi \rightarrow \bar{\psi} \psi$ scatterings (with $\psi$ a fermion) and how this leads to unconstrained combinations of Wilson ...
Brivio, Ilaria, Trott, Michael
core +2 more sources
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
Analysis of General Power Counting Rules in Effective Field Theory [PDF]
, 2016 We derive the general counting rules for a quantum effective field theory (EFT) in $\mathsf{d}$ dimensions. The rules are valid for strongly and weakly coupled theories, and predict that all kinetic energy terms are canonically normalized. They determine
Gavela, M. B. +3 more
core +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