Results 51 to 60 of about 620 (125)

A $$ {\mathbbm{CP}}^2 $$ SMEFT

open access: yesJournal of High Energy Physics
Abstract An extension of the Standard Model is proposed, where the Higgs field is valued in the complex projective plane $$ {\mathbbm{CP}}^2 $$ CP 2 , rather than
openaire   +4 more sources

Weak scale triggers in the SMEFT

open access: yesJournal of High Energy Physics
A bstract There are no weak scale triggers in the SMEFT up to dimension six that can solve the hierarchy problem far above the weak scale. Our arguments can be used to show that the same is true at dimension eight.
Pier Giuseppe Catinari   +2 more
openaire   +2 more sources

Field reparametrization in SMEFT [PDF]

open access: yesThe 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   +1 more source

Improving the global SMEFT picture with bounds on neutrino NSI

open access: yesJournal of High Energy Physics
We analyze how neutrino oscillation and coherent elastic neutrino-nucleus scattering data impact the global SMEFT fit. We first review the mapping between the SMEFT parameters and the so-called NSI framework, commonly considered in the neutrino ...
Pilar Coloma   +5 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

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

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

To profile or to marginalize - A SMEFT case study

open access: yesSciPost Physics
Global SMEFT analyses have become a key interpretation framework for LHC physics, quantifying how well a large set of kinematic measurements agrees with the Standard Model. This agreement is encoded in measured Wilson coefficients and their uncertainties. A technical challenge of global analyses are correlations. We compare, for the first time, results
Brivio, Ilaria   +5 more
openaire   +4 more sources

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

Higgs production from anomalous gluon dynamics

open access: yesJournal of High Energy Physics
We present a two-loop analysis of the contributions to Higgs production via gluon-gluon fusion arising from the triple-gluon operator in the Standard Model effective field theory (SMEFT).
Ulrich Haisch
doaj   +1 more source

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