Same-sign WW scattering in the HEFT: discoverability vs. EFT validity

Kozów, Paweł; Merlo, Luca; Pokorski, S.; Szleper, M.

doi:10.1007/jhep07(2019)021

Cited by 23 publications

(26 citation statements)

References 119 publications

(212 reference statements)

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“…riety of studies of the SMEFT, for example, in electroweak processes [106][107][108][109][110][111], flavour physics [112][113][114][115][116][117][118][119][120], low-energy precision data [121][122][123], diboson measurements [124][125][126][127][128][129][130][131], at dimension 8 [87,88,[132][133][134][135][136] (where collider positivity constraints are particularly relevant [136][137][138][139][140]), and its connection with UV-complete models, both at tree-level [141][142][143][144][145][146][147] and one-loop [148][149][150]…”

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

J. High Energ. Phys.

201

167

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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.

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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

J. High Energ. Phys.

201

167

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“…6 We will just consider them here to illustrate how stringent become the bounds on the resonance masses, for that level of precision in F 4 and F 5 . An improved experimental analysis of these two LECs is needed, given the relevance of unitarity corrections in high-energy vector-boson scattering [24][25][26]40,41,43,44] and the possible caveats concerning the validity of the effective theory in collider analyses [45,46]. These results are summarized in Table V. As shown in Tables I and II, the…”

Section: Experimental Constraintsmentioning

confidence: 99%

Bottom-up approach within the electroweak effective theory: Constraining heavy resonances

2020

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The LHC has confirmed the existence of a mass gap between the known particles and possible new states. Effective field theory is then the appropriate tool to search for low-energy signals of physics beyond the Standard Model. We adopt the general formalism of the electroweak effective theory, with a nonlinear realization of the electroweak symmetry breaking, where the Higgs is a singlet with independent couplings. At higher energies we consider a generic resonance Lagrangian which follows the above-mentioned nonlinear realization and couples the light particles to bosonic heavy resonances with J P ¼ 0 AE and J P ¼ 1 AE. Integrating out the resonances and assuming a proper short-distance behavior, it is possible to determine or to constrain most of the bosonic low-energy constants in terms of resonance masses. Therefore, the current experimental bounds on these bosonic low-energy constants allow us to constrain the resonance masses above the TeV scale, by following a typical bottom-up approach, i.e., the fit of the low-energy constants to precise experimental data enables us to learn about the high-energy scales, the underlying theory behind the Standard Model.

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“…1 left) reveals that sizeable deviations from the SM are generally confined to a narrow region just before the unitarity limit [4]. For this reason, in the leptonic same-sign WW process, the "EFT triangles" for all the individual dimension-8 operators are tiny or vanishing, both in the SMEFT formalism [3] and in the HEFT formalism [5].…”

Section: Pos(lhcp2020)023mentioning

confidence: 99%

EFT validity issues in Vector Boson Scattering processes

Szleper¹,

Chaudhary²,

Kalinowski³

et al. 2020

Proceedings of the Eighth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2020)

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Vector Boson Scattering (VBS) processes are regarded as the best lab to study the VVVV quartic couplings, where V = W, Z. Such studies are carried in the framework of Effective Field Theories (EFT), but the EFT formalism is often not used in a fully consistent way. We discuss the limitations of the EFT approach to describe New Physics effects in VBS data. We argue that the "clipping" technique is the most theory-motivated way to do data analysis in the EFT language and discuss first results from an analysis of CMS Run 2 data on the W Z and same-sign WW process, with and without "clipping" implemented.

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Same-sign WW scattering in the HEFT: discoverability vs. EFT validity

Cited by 23 publications

References 119 publications

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

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

Bottom-up approach within the electroweak effective theory: Constraining heavy resonances

EFT validity issues in Vector Boson Scattering processes

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