Enhancing fits of SMEFT Wilson coefficients in the top-quark sector

Grunwald, Cornelius; Bißmann, Stefan; Erdmann, J.; Hiller, Gudrun; Kroeninger, K.

doi:10.22323/1.390.0323

Cited by 1 publication

(2 citation statements)

References 6 publications

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“…The marginalized posterior probability distribution of 𝛾 𝑎 of the global fit (dark blue) shown in Fig. 2 exhibits a distinct double peak behavior with a larger peak at 𝛾 𝑎 = −1.2 and a smaller peak at 𝛾 𝑎 = 1.9, while the distribution of 𝛾 𝑏 (see [8]) is rather flat. The fit with the 𝑏 → 𝑠 measurements set to their SM prediction (green), in contrast, features only one narrow peak centered around 𝛾 𝑎 = 0.…”

Section: Global Smeft Fitmentioning

confidence: 96%

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Synergies of Drell-Yan, beauty, top, and Z observables in MFV-SMEFT

Nollen,

Grunwald,

Hiller

et al. 2023

Proceedings of 21st Conference on Flavor Physics and CP Violation — PoS(FPCP2023)

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The Standard Model Effective Field Theory (SMEFT) is a powerful tool to search for new physics in a model-independent way. We explore the synergies arising from different types of observables in a combined, global SMEFT fit. Specifically, we investigate the combination of top-quark measurements, 𝑏 → 𝑠 flavor changing neutral current transitions, 𝑍 → 𝑏 b and 𝑍 → 𝑐 c, as well as Drell-Yan data from the LHC. We also examine the impact of Minimal Flavor Violation (MFV) as a flavor pattern in the global fit. We find that the combination of high-p 𝑇 with flavor physics observables provides powerful synergies that significantly improve the fit and enable more precise tests of various SMEFT operators. By incorporating different observables, we are able to remove flat directions in the parameter space and infer on the flavor structure based on the MFV parameterization. In particular, we find that MFV significantly strengthens the constraints in comparison to a flavor-specific approach. Furthermore, our analysis yields a prediction for the dineutrino branching ratios B (𝐵 → 𝐾 ( * ) 𝜈 ν) within MFV, which can be tested experimentally at Belle II.

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Section: Global Smeft Fitmentioning

confidence: 96%

“…We absorb all higher orders of top-Yukawa insertions into the ratio 𝛾 𝑎 as they lead to the same coupling pattern. See [8] for the definitions for other quark bilinears.…”

Section: Mfv In Smeftmentioning

confidence: 99%