Positivity bounds on Minimal Flavor Violation

Bonnefoy, Quentin; Gendy, Emanuele; Grojean, Christophe

doi:10.1007/jhep04(2021)115

Cited by 40 publications

(28 citation statements)

References 24 publications

(62 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.

187

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.

187

167

View full text Add to dashboard Cite

show abstract

“…These original forward limit scalar bounds have been extended to general spins [4,5] away from the forward limit [5,6]. These bounds have proven fruitful in placing constraints on interacting spin-2 fields [7][8][9][10][11][12][13][14], restricting beyond standard model interactions [15][16][17][18][19][20][21][22][23][24], and providing a new light on properties of string amplitudes [25,26]. Most recently it has been recognized that by using more information from crossing symmetry and the partial wave expansion it is possible to put upper and lower bounds on Wilson coefficients [27][28][29][30][31] in certain cases ruling out classes of theories from having a standard UV completion such as weakly broken Galileon theories [27,28].…”

Section: Introductionmentioning

confidence: 99%

QED positivity bounds

et al. 2021

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We apply positivity bounds directly to a Uð1Þ gauge theory with charged scalars and charged fermions, i.e., QED, minimally coupled to gravity. Assuming that the massless t-channel pole may be discarded, we show that the improved positivity bounds are violated unless new physics is introduced at the parametrically low scale Λ new ∼ ðemM Pl Þ 1=2 , consistent with similar results for scalar field theories, far lower than the scale implied by the weak gravity conjecture. This is sharply contrasted with previous treatments which focus on the application of positivity bounds to the low energy gravitational Euler-Heisenberg effective theory only. We emphasize that the low cutoff is a consequence of applying the positivity bounds under the assumption that the pole may be discarded. We conjecture an alternative resolution that a small amount of negativity, consistent with decoupling limits, is allowed and is not in conflict with standard UV completions, including weakly coupled ones.

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“…[32] incorporates supersymmetry in constraints of the form of [31] on Yang-Mills operators, although their discussion has little overlap with that presented here. In [33], positivity bounds were derived for three flavours of SM quarks under the assumption of minimal flavour violation but only from consideration of scattering of pure states. Finally, [34] makes advances on the issue of constraining theories with multiple species in which the space of couplings is a non-polyhedral cone.…”

Section: Jhep07(2021)143mentioning

confidence: 99%

Causality, unitarity and symmetry in effective field theory

Trott

2021

J. High Energ. Phys.

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Sum rules in effective field theories, predicated upon causality, place restrictions on scattering amplitudes mediated by effective contact interactions. Through unitarity of the S-matrix, these imply that the size of higher dimensional corrections to transition amplitudes between different states is bounded by the strength of their contributions to elastic forward scattering processes. This places fundamental limits on the extent to which hypothetical symmetries can be broken by effective interactions. All analysis is for dimension 8 operators in the forward limit. Included is a thorough derivation of all positivity bounds for a chiral fermion in SU(2) and SU(3) global symmetry representations resembling those of the Standard Model, general bounds on flavour violation, new bounds for interactions between particles of different spin, inclusion of loops of dimension 6 operators and illustration of the resulting strengthening of positivity bounds over tree-level expectations, a catalogue of supersymmetric effective interactions up to mass dimension 8 and 4 legs and the demonstration that supersymmetry unifies the positivity theorems as well as the new bounds.

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Positivity bounds on Minimal Flavor Violation

Cited by 40 publications

References 24 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

QED positivity bounds

Causality, unitarity and symmetry in effective field theory

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