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Explaining the $ {B}_{d,s}\to {K}^{\left(\ast \right)}{\overline{K}}^{\left(\ast \right)} $ non-leptonic puzzle and charged-current B-anomalies via scalar leptoquarks


Lizana, Javier M; Matias, Joaquim; Stefanek, Ben A (2023). Explaining the $ {B}_{d,s}\to {K}^{\left(\ast \right)}{\overline{K}}^{\left(\ast \right)} $ non-leptonic puzzle and charged-current B-anomalies via scalar leptoquarks. Journal of High Energy Physics, 2023(9):114.

Abstract

We present a model based on S$_{1}$ scalar leptoquarks to solve the tension observed in the recently proposed non-leptonic optimized observables $ {L}_{K^{\ast }{\overline{K}}^{\ast }} $ and $ {L}_{K\overline{K}} $. These observables are constructed as ratios of U-spin related decays based on $ {B}_{d,s}^0\to {K}^{\left(\ast \right)0}{\overline{K}}^{\left(\ast \right)0} $. The model gives a one-loop contribution to the Wilson coefficient of the chromomagnetic dipole operator needed to explain the tension in both non-leptonic observables, while naturally avoiding large contributions to the corresponding electromagnetic dipoles. The necessary chiral enhancement comes from an O(1) Yukawa coupling with a TeV-scale right-handed neutrino running in the loop. We endow the model with a U(2) flavor symmetry, necessary to protect light-family flavor observables that otherwise would be in tension. Furthermore, we show that the same S$_{1}$ scalar leptoquark is capable of simultaneously explaining the hints of lepton flavor universality violation observed in charged-current B-decays. The model therefore provides a potential link between two puzzles in B-physics and TeV-scale neutrino mass generation. Finally, the combined explanation of the B-physics puzzles unavoidably results in an enhancement of $ \mathcal{B}\left(B\to K\nu \overline{\nu}\right) $, yielding a value close to present bounds.

Abstract

We present a model based on S$_{1}$ scalar leptoquarks to solve the tension observed in the recently proposed non-leptonic optimized observables $ {L}_{K^{\ast }{\overline{K}}^{\ast }} $ and $ {L}_{K\overline{K}} $. These observables are constructed as ratios of U-spin related decays based on $ {B}_{d,s}^0\to {K}^{\left(\ast \right)0}{\overline{K}}^{\left(\ast \right)0} $. The model gives a one-loop contribution to the Wilson coefficient of the chromomagnetic dipole operator needed to explain the tension in both non-leptonic observables, while naturally avoiding large contributions to the corresponding electromagnetic dipoles. The necessary chiral enhancement comes from an O(1) Yukawa coupling with a TeV-scale right-handed neutrino running in the loop. We endow the model with a U(2) flavor symmetry, necessary to protect light-family flavor observables that otherwise would be in tension. Furthermore, we show that the same S$_{1}$ scalar leptoquark is capable of simultaneously explaining the hints of lepton flavor universality violation observed in charged-current B-decays. The model therefore provides a potential link between two puzzles in B-physics and TeV-scale neutrino mass generation. Finally, the combined explanation of the B-physics puzzles unavoidably results in an enhancement of $ \mathcal{B}\left(B\to K\nu \overline{\nu}\right) $, yielding a value close to present bounds.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Uncontrolled Keywords:Nuclear and High Energy Physics
Language:English
Date:19 September 2023
Deposited On:11 Jan 2024 13:46
Last Modified:28 Jun 2024 03:37
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/jhep09(2023)114
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)