SU(3)F analysis for beauty baryon decays

Dery, Avital; Ghosh, Mitrajyoti; Grossman, Yuval; Schacht, Stefan

doi:10.1007/jhep03(2020)165

Cited by 27 publications

(23 citation statements)

References 138 publications

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“…Since the data are also consistent with 0, it is clear that future experiments with higher accuracy are needed. The mixing effects in Λ þ c → Σπ are in the first order of θ, while those in Λ þ c → Σ 0 e þ ν e and Λ 0 b → Σ 0 J=ψ [23] are in the second one. Clearly, the experiments in Λ þ c → Σπ are more promising for searching the Σ 0 − Λ 0 mixing.…”

Section: Mass Differencesmentioning

confidence: 99%

Mixing effects of Σ0−Λ0 in Λc+ decays

2020

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We analyze the mixing between Σ 0 and Λ 0 based on the baryon masses. We distinguish the contributions from QCD and QED in the baryon mass splittings. We find that the mixing angle between Σ 0 and Λ 0 is ð2.07 AE 0.03Þ × 10 −2 , which leads to the decay branching fraction and up-down asymmetry of Λ þ c → Σ 0 e þ ν e to be BðΛ þ c → Σ 0 e þ ν e Þ ¼ ð1.5 AE 0.2Þ × 10 −5 and αðΛ þ c → Σ 0 e þ ν e Þ ¼ −0.86 AE 0.04, respectively. Moreover, we obtain that ΔB ≡ BðΛ þ c → Σ 0 π þ Þ − BðΛ þ c → Σ þ π 0 Þ ¼ ð3.8 AE 0.5Þ × 10 −4 and Δα ≡ αðΛ þ c → Σ 0 π þ Þ − αðΛ þ c → Σ þ π 0 Þ ¼ ð−1.6 AE 0.7Þ × 10 −2 , which should vanish without the mixing.

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Section: Mass Differencesmentioning

confidence: 99%

Mixing effects of Σ0−Λ0 in Λc+ decays

2020

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“…On the other hand, the Ξ 0 c → Σ 0 form factors receive a factor 1/ √ 2 relative to the Ξ + c → Σ + ones due to isospin [25]. Then, U-spin relates Ξ 0 c → Σ 0 form factors to Ξ 0 c → Λ 0 ones [26,27] with a relative factor of √ 3. For Ω 0 c decays no relation with the Λ c exists since the Ω 0 c sits in another SU(3) F -multiplet [20].…”

Section: Charmed Baryons Other Than λ Cmentioning

confidence: 99%

Probing for new physics with rare charm baryon (Λc, Ξc, Ωc) decays

Golz

Hiller

Magorsch

2021

J. High Energ. Phys.

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We analyze rare charm baryon decays within the standard model and beyond. We identify all null test observables in unpolarized Λc→ pℓ+ℓ−, ℓ = e, μ decays, and study the new physics sensitivities. We find that the longitudinal dilepton polarization fraction FL is sensitive to electromagnetic dipole couplings $$ {C}_7^{\left(\prime \right)} $$ C 7 ′ , and to the right-handed 4-fermion vector coupling $$ {C}_9^{\left(\prime \right)} $$ C 9 ′ . The forward-backward asymmetry, AFB, due to the GIM-suppression a standard model null test already, probes the left-handed axialvector 4-fermion coupling C10; its CP–asymmetry, $$ {A}_{\mathrm{FB}}^{\mathrm{CP}} $$ A FB CP probes CP-violating phases in C10. Physics beyond the standard model can induce branching ratios of dineutrino modes Λc→ pν$$ \overline{\nu} $$ ν ¯ up to a few times 10−5, and one order of magnitude smaller if lepton flavor universality is assumed, while standard model rates are negligible. Charged lepton flavor violation allows for striking signals into e±μ∓ final states, up to 10−6 branching ratios model-independently, and up to order 10−8 in leptoquark models. Related three-body baryon decays Ξc→ Σℓℓ, Ξc→ Λℓℓ and Ωc→ Ξℓℓ offer similar opportunities to test the standard model with |∆c| = |∆u| = 1 transitions.

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“…In this specific case, Σ 0 * contributions are expected to be minor since they proceed through a ∆I = 1 transition, contrary to the ∆I = 0 decays Λ 0 b → Λ * γ [15]. Although isospin suppressed, Σ 0 * resonances could be present in the decay.…”

Section: Additional Measurementsmentioning

confidence: 93%