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Comprehensive analyses of rare $Λ_{b} \to Λ ℓ^{+} ℓ^{-}$ , $Σ_{b} \to Σ ℓ^{+} ℓ^{-}$ and $Ξ_{b} \to Ξ ℓ^{+} ℓ^{-}$ decays in the 2HDM

Z. Tavukoğlu ¹, A. T. Olgun ¹, and K. Azizi ^2,3,*

¹Vocational School, Istanbul Okan University, Tuzla Campus, 34959 Istanbul, Türkiye
²Department of Physics, University of Tehran, North Karegar Avenue, Tehran 14395-547, Iran
³Department of Physics, Dogus University, Dudullu-Ümraniye, 34775 Istanbul, Türkiye

^*Contact author: kazem.azizi@ut.ac.ir

Phys. Rev. D 114, 014039 – Published 20 July, 2026

DOI: https://doi.org/10.1103/21j2-12b7

Abstract

We investigate rare special dileptonic decays of $Λ_{b}$ , $Σ_{b}$ , and $Ξ_{b}$ baryons in the standard model and context of the general two-Higgs-doublet model with Type III. Specifically, we consider the decays $Λ_{b} \to Λ ℓ^{+} ℓ^{-}$ , $Σ_{b} \to Σ ℓ^{+} ℓ^{-}$ , and $Ξ_{b} \to Ξ ℓ^{+} ℓ^{-}$ , where $ℓ$ represents $μ$ or $τ$ lepton. By studying these rare decays, we aim to assess the impact of the two-Higgs-doublet model with Type III on various observables, such as the differential decay width, the total decay width, the differential branching ratio, the total branching ratio, and lepton forward-backward asymmetries using the decay amplitude and the transition matrix elements in terms of form factors calculated via light cone QCD in full theory. We compare our results to those of the standard model, as well as existing lattice QCD predictions and experimental data, to assess the agreement and viability of the two-Higgs-doublet model with Type III. Furthermore, we highlight the potential for experimental investigations of these decay channels in the near future. The soon-to-be updated LHCb and/or Belle II detectors, renowned for their capabilities in studying rare decays, present excellent opportunities for probing the predicted branching ratios.

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Phys. Rev. D 114, 014039– Published 20 July, 2026

Vol. 114, Iss. 1 — 1 July 2026

Received 17 April 2026
Accepted 30 June 2026

DOI: https://doi.org/10.1103/21j2-12b7

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Comprehensive analyses of rare $Λ_{b} \to Λ ℓ^{+} ℓ^{-}$ , $Σ_{b} \to Σ ℓ^{+} ℓ^{-}$ and $Ξ_{b} \to Ξ ℓ^{+} ℓ^{-}$ decays in the 2HDM

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Comprehensive analyses of rare Λb→Λℓ+ℓ−, Σb→Σℓ+ℓ− and Ξb→Ξℓ+ℓ− decays in the 2HDM

Abstract

Physics Subject Headings (PhySH)

Article Text

References (60)

Comprehensive analyses of rare $Λ_{b} \to Λ ℓ^{+} ℓ^{-}$ , $Σ_{b} \to Σ ℓ^{+} ℓ^{-}$ and $Ξ_{b} \to Ξ ℓ^{+} ℓ^{-}$ decays in the 2HDM