Dijets at Tevatron cannot constrain SMEFT four-quark operators

188

167

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). For the first time, we include LHC data on top production and differential distributions together with Higgs production and decay rates and Simplified Template Cross-Section (STXS) measurements in a global fit, as well as precision electroweak and diboson measurements from LEP and the LHC, in a global analysis with SMEFT operators of dimension 6 included linearly. We present the constraints on the coefficients of these operators, both individually and when marginalised, in flavour-universal and top-specific scenarios, studying the interplay of these datasets and the correlations they induce in the SMEFT. We then explore the constraints that our linear SMEFT analysis imposes on specific ultra-violet completions of the Standard Model, including those with single additional fields and low-mass stop squarks. We also present a model-independent search for deformations of the SM that contribute to between two and five SMEFT operator coefficients. In no case do we find any significant evidence for physics beyond the SM. Our underlying Fitmaker public code provides a framework for future generalisations of our analysis, including a quadratic treatment of dimension-6 operators.

Section: Jhep04(2021)279mentioning

confidence: 99%

Top, Higgs, diboson and electroweak fit to the Standard Model effective field theory

Ellis

Madigan

Mimasu

et al. 2021

188

167

“…Similar statements apply to the constraints following from the CMS measurement of the dijet angular distributions [19]. On general grounds, the limits (2.5) and (3.2) therefore only constrain strongly-coupled ultraviolet (UV) completions -for related discussions of the applicability of the SMEFT to dijet searches see [13][14][15][16][17][18]. The situation is better in the case of the bound on C bG that we have derived from the recent ATLAS measurement [45] of pp → bb Z/γ * → bb + − , because the energy scales tested by this measurement are all below 1 TeV.…”

Section: Discussionmentioning

confidence: 70%

“…Jet physics has previously been used to put constraints on SMEFT operators [13][14][15][16][17][18]. In this section we will exploit searches for unflavoured jet pairs to constrain the magnitudes of the Wilson coefficients of the operators introduced in (1.1).…”

Section: Constraints From Dijet Angular Distributionsmentioning

confidence: 99%

Beautiful and charming chromodipole moments

Haisch

Koole

2021

In the context of the Standard Model effective field theory we derive direct and indirect bounds on chromodipole operators involving the bottom and charm quark. We find that the experimental upper limit on the neutron electric dipole moment puts severe constraints on the imaginary parts of the Wilson coefficients of both chromodipole operators. The magnitudes of the Wilson coefficients are instead only weakly constrained by dijet searches and Z-boson production in association with bottom-quark jets. Flavour physics does not provide meaningful bounds.

“…This point has also been stressed in several recent studies on other observables, see refs. [34,35].…”

Section: Smeft and Geosmeftmentioning

confidence: 99%

EWPD in the SMEFT to dimension eight

Corbett

Helset

Martin

et al. 2021

We calculate the $$ \mathcal{O}\left({\left\langle {H}^{\dagger }H\right\rangle}^2/{\Lambda}^4\right) $$ O H † H 2 / Λ 4 corrections to LEP electroweak precision data using the geometric formulation of the Standard Model Effective Field Theory (SMEFT). We report our results in simple-to-use interpolation tables that allow the interpretation of this data set to dimension eight for the first time. We demonstrate the impact of these previously unknown terms in the case of a general analysis in the SMEFT, and also in the cases of two distinct models matched to dimension eight. Neglecting such dimension-eight corrections to LEP observables introduces a theoretical error in SMEFT studies. We report some preliminary studies defining such a theory error, explicitly demonstrating the effect of previously unknown dimension-eight SMEFT corrections on LEP observables.