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The work computes differential and total branching ratios plus forward-backward asymmetries for Λ_b → Λ ℓ⁺ℓ⁻, Σ_b → Σ ℓ⁺ℓ⁻ and Ξ_b → Ξ ℓ⁺ℓ⁻ in 2HDM Type III and contrasts them with SM predictions.

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2026-05-10 08:39 UTC pith:LD2ND7YS

arxiv 2604.15834 v3 pith:LD2ND7YS submitted 2026-04-17 hep-ph hep-exhep-lat

Comprehensive analyses of rare Λ_b rightarrow Λ ell^+ ell^-, Sigma_b rightarrow Sigma ell^+ ell^- and Xi_b rightarrow Xi ell^+ ell^- decays in 2HDM

Z. Tavuko\u{g}lu , A. T. Olgun , K. Azizi This is my paper
classification hep-ph hep-exhep-lat
keywords rightarrowdecayslambdamodelsigmadecayrarebranching
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

Rare decays of bottom baryons into a lighter baryon plus a lepton pair are suppressed in the Standard Model and therefore sensitive to possible new particles. The authors focus on three such channels involving Λ_b, Σ_b and Ξ_b baryons decaying to muons or taus. They embed the decays in a general Two-Higgs-Doublet Model of Type III, which adds extra Higgs bosons that can modify the effective operators governing the process. Form factors that describe the baryon-to-baryon transition are taken from light-cone QCD sum rules in full theory. With these ingredients they evaluate the differential branching ratio, the integrated branching ratio and the lepton forward-backward asymmetry as functions of the dilepton invariant mass. Results are compared with Standard-Model expectations, lattice-QCD calculations and any available experimental limits. The paper concludes that the 2HDM Type-III contributions can be sizable in some channels and that the upcoming LHCb and Belle II upgrades should be able to probe the predicted rates.

Core claim

We aim to assess the impact of the Two-Higgs-Doublet Model with Type III on various observables, such as the differential branching ratio, 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.

Load-bearing premise

The transition matrix elements are expressed in terms of form factors calculated via light-cone QCD sum rules in full theory; any systematic uncertainty or model dependence in those form factors directly propagates into the predicted observables.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claims rest on light-cone QCD form factors taken from earlier work and on the choice of 2HDM Type-III parameters that are not derived from first principles within the paper.

free parameters (1)
  • 2HDM Type-III Yukawa couplings or tan β
    These parameters are adjusted to produce observable effects and are not fixed by the present calculation.
axioms (1)
  • domain assumption Light-cone QCD sum rules provide reliable form factors for the baryon transitions
    Invoked when the decay amplitude is written in terms of these form factors.

pith-pipeline@v0.9.0 · 5593 in / 1421 out tokens · 63583 ms · 2026-05-10T08:39:45.342789+00:00 · methodology

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We investigate rare special dileptonic decays of $ \Lambda_b$, $\Sigma_b$ and $\Xi_b $ baryons in the Standard Model and context of the general Two-Higgs-Doublet Model with Type III. Specifically, we consider the decays $ \Lambda_b \rightarrow \Lambda \ell^+ \ell^-$, $\Sigma_b \rightarrow \Sigma \ell^+ \ell^-$ and $\Xi_b \rightarrow \Xi \ell^+ \ell^-$, where $\ell$ represents $\mu$ or $\tau$ 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, 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.

Figures

Figures reproduced from arXiv: 2604.15834 by A. T. Olgun, K. Azizi, Z. Tavuko\u{g}lu.

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