Electroweak loops as a probe of new physics in $$ t\overline{t} $$ production at the LHC

Martini, Till; Schulze, Markus

doi:10.1007/jhep04(2020)017

Cited by 8 publications

(6 citation statements)

References 73 publications

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“…Several directions of further developments can be identified. The first is to extend our implementation to the elements necessary for EW loop computations, building upon the existing automation of EW corrections in the SM [48] and the available analytic results in the SMEFT [49][50][51][52][53][54][55][56][57][58][59][60]. Dedicated studies of one-loop EW effects have already appeared [61,62].…”

Section: Discussionmentioning

confidence: 99%

Automated one-loop computations in the SMEFT

Degrande,

Durieux,

Maltoni

et al. 2020

Preprint

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We present the automation of one-loop computations in the standard-model effective field theory at dimension six. Our implementation, dubbed SMEFT@NLO, contains ultraviolet and rational counterterms for bosonic, two-and four-fermion operators. It presently allows for fully differential predictions, possibly matched to parton shower, up to one-loop accuracy in QCD. We illustrate the potential of the implementation with novel loop-induced and next-to-leading order computations relevant for top-quark, electroweak, and Higgs-boson phenomenology at the LHC and future colliders.

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Section: Discussionmentioning

confidence: 99%

Automated one-loop computations in the SMEFT

Degrande,

Durieux,

Maltoni

et al. 2020

Preprint

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“…In Ref. [56] the calculation of electroweak loops in hadronic t t production with modified couplings of the top quark to the electroweak gauge bosons in terms of higher-dimensional EFT operators has been presented by some of us. Building upon the techniques developed in Ref.…”

Section: The Nlo Electroweak Effectsmentioning

confidence: 99%

“…Building upon the techniques developed in Ref. [56], we allow for arbitrary CP scenarios of the top quark Yukawa couplings parametrized by the effective Lagrangian of the interaction of the top quark t and a scalar particle…”

Section: The Nlo Electroweak Effectsmentioning

confidence: 99%

Probing the CP structure of the top quark Yukawa coupling: Loop sensitivity vs. on-shell sensitivity

Martini,

Pan,

Schulze

et al. 2021

Preprint

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The question whether the Higgs boson is connected to additional CP violation is one of the driving forces behind precision studies at the Large Hadron Collider. In this work, we investigate the CP structure of the top quark Yukawa interaction-one of the most prominent places for searching for New Physics-through Higgs boson loops in top quark pair production. We calculate the electroweak corrections including arbitrary CP mixtures at next-to-leading-order in the Standard Model Effective Field Theory. This approach of probing Higgs boson degrees of freedom relies on the large t t cross section and the excellent perturbative control. In addition, we consider all direct probes with on-shell Higgs boson production in association with a single top quark or top quark pair. This allows us to contrast loop sensitivity versus on-shell sensitivity in these fundamentally different process dynamics. We find that loop sensitivity in t t production and on-shell sensitivity in t tH and tH provide complementary handles over a wide range of parameter space.

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“…The classification of effective operators contributing to top quark processes [4][5][6] marked the beginning of a significant research activity devoted to find novel ways to constrain higher dimensional operators involving top quarks using LHC data. The processes that have been considered include top pair production [6][7][8][9][10], top decay [11,12], and top production in association with a Higgs [13,14] a Z or γ [8,14,15], or b quarks [16]. There have also been studies using low energy observables [17][18][19][20][21] as well as future lepton colliders [22][23][24][25][26][27][28].…”

Section: Jhep08(2020)036mentioning

confidence: 99%

Constraining new physics with single top production at LHC

Stolarski

Tonero

2020

J. High Energ. Phys.

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We study effects of beyond the Standard Model physics coupling third generation quarks to leptons of the first two generations. We parametrize these effects by dimension-six effective operators, and we also consider related simplified UV completions: scalar leptoquark and W models. We derive new constraints on these scenarios by using recent ATLAS measurements of differential cross sections of single top production in association with a W boson, and also show how these limits will evolve with future data. We also describe how the limits can be significantly improved by using ratios of differential distributions with different flavours of leptons.

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Electroweak loops as a probe of new physics in $$ t\overline{t} $$ production at the LHC

Cited by 8 publications

References 73 publications

Automated one-loop computations in the SMEFT

Automated one-loop computations in the SMEFT

Probing the CP structure of the top quark Yukawa coupling: Loop sensitivity vs. on-shell sensitivity

Constraining new physics with single top production at LHC

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