Resolving the flavor structure in the MFV-SMEFT

Bruggisser, Sebastian; Dyk, Danny van; Westhoff, Susanne

doi:10.1007/jhep02(2023)225

Cited by 15 publications

(12 citation statements)

References 83 publications

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“…When repeating the fit but setting the 𝑏 → 𝑠 measurements to match the SM expectations only a single sharp peak around 𝛾 𝑎 = 0 emerges, as shown by the green curve. These patterns suggest that deviations from the SM expectation in 𝑏 → 𝑠 measurements, currently observed at around 3𝜎, impact the shape of the posterior distribution of 𝛾 𝑎 and indicate that higher-order corrections in the MFV expansion are favored by the data, as has also been observed before [3,4]. This further emphasizes the potential of this parameter to probe the flavor structure of possible BSM phenomena.…”

Section: Cornelius Grunwaldmentioning

confidence: 54%

“…The Standard Model Effective Field Theory (SMEFT) serves as a common framework in the search for new physics (NP) phenomena beyond the electroweak scale. It allows a predominantly model-independent approach and enables connections between different sectors, especially beauty and top, via the SU(2) 𝐿 symmetry, as demonstrated in multiple studies [1][2][3][4]. The SMEFT Lagrangian is constructed by appending a series of higher-dimensional operators 𝑂 (𝑑) 𝑖 to the Standard Model (SM) Lagrangian.…”

Section: Effective Field Theoriesmentioning

confidence: 99%

“…In SMEFT, 𝑏-hadron decays into charged leptons are directly connected to 𝑏-hadron decays into neutrinos via the SU(2) 𝐿 symmetry. While 𝑏 → 𝑠ℓ + ℓ − transitions probe the linear combination 𝐶 (+) 𝑙𝑞 = 𝐶 (1) 𝑙𝑞 + 𝐶 (3) 𝑙𝑞 , dineutrino processes with 𝑏 → 𝑠𝜈 ν transitions probe the orthogonal linear combination 𝐶 (−) 𝑙𝑞 = 𝐶 (1) 𝑙𝑞 − 𝐶 (3) 𝑙𝑞 . Combining both types of processes would thus allow to improve the constraints on the individual coefficients 𝐶 (1) 𝑙𝑞 and 𝐶 (3) 𝑙𝑞 .…”

Section: Influence Of Dineutrino Branching Ratiosmentioning

confidence: 99%

“…While 𝑏 → 𝑠ℓ + ℓ − transitions probe the linear combination 𝐶 (+) 𝑙𝑞 = 𝐶 (1) 𝑙𝑞 + 𝐶 (3) 𝑙𝑞 , dineutrino processes with 𝑏 → 𝑠𝜈 ν transitions probe the orthogonal linear combination 𝐶 (−) 𝑙𝑞 = 𝐶 (1) 𝑙𝑞 − 𝐶 (3) 𝑙𝑞 . Combining both types of processes would thus allow to improve the constraints on the individual coefficients 𝐶 (1) 𝑙𝑞 and 𝐶 (3) 𝑙𝑞 . So far, only experimental upper limits for 𝑏 → 𝑠𝜈 ν transitions are available, which are not considered in our analysis.…”

Section: Influence Of Dineutrino Branching Ratiosmentioning

confidence: 99%

See 3 more Smart Citations

Predicting ${\cal{B}}(B\to K^{(*)}\nu \bar \nu)$ within the MFV-SMEFT using $B$, Top, $Z$ and Drell-Yan data

Grunwald,

Hiller,

Kröninger

et al. 2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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In high-energy physics, the Standard Model Effective Field Theory (SMEFT) serves as a framework for investigating new physics phenomena without relying on a specific model. In this study, we assess the potential of combining observables from different physics sectors in a unified SMEFT fit. Our analysis considers top-quark measurements, 𝑏 → 𝑠 flavor changing neutral current transitions, transitions like 𝑍 → 𝑏 b and 𝑍 → 𝑐 c, alongside Drell-Yan data from the Large Hadron Collider (LHC). We explore the influence of Minimal Flavor Violation (MFV) when used as a flavor pattern in the global fit. By incorporating observables from different physics sectors, we can address flat directions in the parameter space and draw conclusions about the flavor structure based on the MFV parameterization. We demonstrate that the combination of measurements from different sectors yields stronger constraints on the SMEFT coefficients than the individual fits and emphasize how synergies in the global approach allow probing scales as high as 18 TeV. Based on the constraints on the Wilson coefficients obtained in our analysis, we predict 𝑏 → 𝑠𝜈 ν branching ratios and and discuss how future measurements of these observables could provide new information in the search for physics beyond the Standard Model when being included in the global fit.

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Section: Cornelius Grunwaldmentioning

confidence: 54%

Section: Effective Field Theoriesmentioning

confidence: 99%

Section: Influence Of Dineutrino Branching Ratiosmentioning

confidence: 99%

Section: Influence Of Dineutrino Branching Ratiosmentioning

confidence: 99%

See 2 more Smart Citations

Predicting ${\cal{B}}(B\to K^{(*)}\nu \bar \nu)$ within the MFV-SMEFT using $B$, Top, $Z$ and Drell-Yan data

Grunwald,

Hiller,

Kröninger

et al. 2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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“…The flavor structure assumes only a minimalistic set of nonzero WCs aligned with b → uℓν. Realistic flavor assumption would imply even more correlations, see e.g [75][76][77]5.…”

mentioning

confidence: 99%

SMEFT restrictions on exclusive b → uℓν decays

Greljo,

Salko,

Smolkovič

et al. 2023

J. High Energ. Phys.

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Exclusive semileptonic b hadron decays (b → uℓν) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element Vub. Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT as a conduit to chart territory beyond the SM, we demonstrate that substantive new physics contributions in b → uℓν are necessarily linked to correlated effects in rare neutral-current b decays, neutral B meson mixing or high-mass Drell-Yan tails. We find that measurements of the latter processes strongly restrict the allowed deviations in the former. A complete set of tree-level mediators, originating from a perturbative ultraviolet model and matching at dimension 6, is thoroughly explored to support this assertion. As a showcase application, we examine the feasibility of a new physics interpretation of the recent tension in exclusive |Vub| extraction from B → Vℓν where V = (ρ, ω).

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Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity

Cirigliano,

Dekens,

de Vries

et al. 2024

J. High Energ. Phys.

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Recent developments in the Standard Model analysis of semileptonic charged-current processes involving light quarks have revealed ~ 3σ tensions in Cabibbo universality tests involving meson, neutron, and nuclear beta decays. In this paper, we explore beyond the Standard Model explanations of this so-called Cabibbo Angle Anomaly in the framework of the Standard Model Effective Field Theory (SMEFT), including not only low-energy charged current processes (‘L’), but also electroweak precision observables (‘EW’) and Drell-Yan collider processes (‘C’) that probe the same underlying physics across a broad range of energy scales. The resulting ‘CLEW’ framework not only allows one to test explanations of the Cabibbo Angle Anomaly, but is set up to provide near model-independent analyses with minimal assumptions on the flavor structure of the SMEFT operators. Besides the global analysis, we consider a large number of simpler scenarios, each with a subset of SMEFT operators, and investigate how much they improve upon the Standard Model fit. We find that the most favored scenarios, as judged by the Akaike Information Criterion, are those that involve right-handed charged currents. Additional interactions, namely oblique operators, terms modifying the Fermi constant, and operators involving right-handed neutral currents, play a role if the CDF determination of the W mass is included in the analysis.

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Resolving the flavor structure in the MFV-SMEFT

Cited by 15 publications

References 83 publications

Predicting ${\cal{B}}(B\to K^{(*)}\nu \bar \nu)$ within the MFV-SMEFT using $B$, Top, $Z$ and Drell-Yan data

Predicting ${\cal{B}}(B\to K^{(*)}\nu \bar \nu)$ within the MFV-SMEFT using $B$, Top, $Z$ and Drell-Yan data

SMEFT restrictions on exclusive b → uℓν decays

Anomalies in global SMEFT analyses. A case study of first-row CKM unitarity

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