The CP-violating decay-rate asymmetry in Σ⁺→pℓ⁺ℓ⁻ is allowed to reach tens of percent and is testable at LHCb.
Aaijet al.,Observation of the very rareΣ + →pµ +µ− decay, Phys
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Kinetic mixing terms are introduced in the parity-doublet model to reproduce the empirical axial charge g_A ≈ 1.28 of the nucleon along with masses of the nucleon and N*(1535).
Branching fraction B(Λ → p μ⁻ ν̄_μ) measured as (1.462 ± 0.016 ± 0.100 ± 0.011) × 10^{-4}, improving prior precision by a factor of two and yielding R^{μe} = 0.175 ± 0.012 consistent with the Standard Model.
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CP violation in $\Sigma^+\to p\ell^+\ell^-$ within the standard model and beyond
The CP-violating decay-rate asymmetry in Σ⁺→pℓ⁺ℓ⁻ is allowed to reach tens of percent and is testable at LHCb.
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Kinetic Mixing and Axial Charges in the Parity-Doublet Model
Kinetic mixing terms are introduced in the parity-doublet model to reproduce the empirical axial charge g_A ≈ 1.28 of the nucleon along with masses of the nucleon and N*(1535).
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Branching fraction measurement of the $\mathit{\Lambda} \to p \mu^- \overline{\nu}_{\mu}$ decay
Branching fraction B(Λ → p μ⁻ ν̄_μ) measured as (1.462 ± 0.016 ± 0.100 ± 0.011) × 10^{-4}, improving prior precision by a factor of two and yielding R^{μe} = 0.175 ± 0.012 consistent with the Standard Model.