Results 81 to 90 of about 3,754 (159)

An EWPD SMEFT likelihood for the LHC — and how to improve it with measurements of W and Z boson properties

open access: yesJournal of High Energy Physics
This paper presents a computer code for analyzing electroweak precision data (EWPD) in the framework of the Standard Model Effective Field Theory (SMEFT), highlights the importance of recent ATLAS and CMS precision measurements, and introduces a novel ...
Hannes Mildner
doaj   +1 more source

Renormalization group equations for the SMEFT operators up to dimension seven

open access: yesJournal of High Energy Physics, 2023
In this paper, we propose a Green’s basis and also a new physical basis for dimension-seven (dim-7) operators, which are suitable for the matching of ultraviolet models onto the Standard Model effective field theory (SMEFT) and the deviation of ...
Di Zhang
doaj   +1 more source

Where is Particle Physics Going?

open access: yes, 2017
The answer to the question in the title is: in search of new physics beyond the Standard Model, for which there are many motivations, including the likely instability of the electroweak vacuum, dark matter, the origin of matter, the masses of neutrinos ...
Ellis, John
core   +1 more source

Putting SMEFT Fits to Work

open access: yes, 2020
The Standard Model Effective Field Theory (SMEFT) provides a consistent framework for comparing precision measurements at the LHC to the Standard Model. The observation of statistically significant non-zero SMEFT coefficients would correspond to physics beyond the Standard Model (BSM) of some sort.
Dawson, Sally   +2 more
openaire   +2 more sources

A case study of SMEFT O 1 / Λ 4 $$ \mathcal{O}\left(1/{\Lambda}^4\right) $$ effects in diboson processes: pp → W ±(ℓ ± ν)γ

open access: yesJournal of High Energy Physics
In this paper we explore pp → W ± (ℓ ± ν)γ to O 1 / Λ 4 $$ \mathcal{O}\left(1/{\Lambda}^4\right) $$ in the SMEFT expansion. Calculations to this order are necessary to properly capture SMEFT contributions that grow with energy, as the interference ...
Adam Martin
doaj   +1 more source

SMEFT interpretation of $\Delta F = 2$ transitions

open access: yesProceedings of 11th International Workshop on the CKM Unitarity Triangle — PoS(CKM2021), 2023
Comment: 7 pages, 2 figures, Contribution to the proceedings of the 11th International Workshop on the CKM Unitarity Triangle (CKM2021), 22-26 November ...
openaire   +2 more sources

Effective field theory interpretation of lepton magnetic and electric dipole moments

open access: yesJournal of High Energy Physics, 2021
We perform a model-independent analysis of the magnetic and electric dipole moments of the muon and electron. We give expressions for the dipole moments in terms of operator coefficients of the low-energy effective field theory (LEFT) and the Standard ...
Jason Aebischer   +5 more
doaj   +1 more source

Constraints on standard model effective field theory for a Higgs boson produced in association with W or Z bosons in the H → b b ¯ $$ \textrm{b}\overline{\textrm{b}} $$ decay channel in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV

open access: yesJournal of High Energy Physics
A standard model effective field theory (SMEFT) analysis with dimension-six operators probing nonresonant new physics effects is performed in the Higgs-strahlung process, where the Higgs boson is produced in association with a W or Z boson, in proton ...
The CMS collaboration   +2382 more
doaj   +1 more source

Holomorphy without supersymmetry in the Standard Model Effective Field Theory

open access: yesPhysics Letters B, 2014
The anomalous dimensions of dimension-six operators in the Standard Model Effective Field Theory (SMEFT) respect holomorphy to a large extent. The holomorphy conditions are reminiscent of supersymmetry, even though the SMEFT is not a supersymmetric ...
Rodrigo Alonso   +2 more
doaj   +1 more source

A Monte Carlo global analysis of the Standard Model Effective Field Theory: the top quark sector

open access: yesJournal of High Energy Physics, 2019
We present a novel framework for carrying out global analyses of the Standard Model Effective Field Theory (SMEFT) at dimension-six: SMEFiT. This approach is based on the Monte Carlo replica method for deriving a faithful estimate of the experimental and
Nathan P. Hartland   +6 more
doaj   +1 more source

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