Lepton flavor violating $$\Lambda _b\rightarrow \Lambda \ell _1\ell _2$$ decay

Das, Diganta

doi:10.1140/epjc/s10052-019-7530-9

Cited by 12 publications

(4 citation statements)

References 38 publications

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“…For = the angular observables in eq. (2.9) contain additional terms due to non-vanishing lepton amplitudes [42]. The modified angular observables in terms of the lepton masses m and m are given in appendix D. We present distributions and branching ratios summing both lepton charge combinations, defining, for instance,…”

Section: Lepton Flavor Violationmentioning

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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Section: Lepton Flavor Violationmentioning

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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“…Charged lepton flavor violation can also be probed with branching ratios into dineutrino final states [14,37], Upper limits assuming flavor conservation (cLFC) are provided in ( 38) - (42).…”

Section: Discussionmentioning

confidence: 99%

“…For = the angular observables in Eq. ( 9) contain additional terms due to non-vanishing lepton amplitudes [42]. The modified angular observables in terms of the lepton masses m and m are given in Appendix D. We present distributions and branching ratios summing both lepton charge combinations, defining, for instance, Model-independent upper limits on LFV branching ratios based on Eq.…”

Section: E Lepton Flavor Violationmentioning

confidence: 99%

Probing for New Physics with Rare Charm Baryon ($Λ_c$, $Ξ_c$, $Ω_c$) Decays

Golz¹,

Hiller²,

Magorsch³

2021

Preprint

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We analyze rare charm baryon decays within the standard model and beyond. We identify all null test observables in unpolarized Λ c → p + − , = e, µ decays, and study the new physics sensitivities. We find that the longitudinal dilepton polarization fraction F L is sensitive to electromagnetic dipole couplings C ( ) 7 , and to the right-handed 4-fermion vector coupling C 9 . The forward-backward asymmetry, A FB , due to the GIM-suppression a standard model null test already, probes the left-handed axialvector 4-fermion coupling C 10 ; its CP-asymmetry, A CP FB , probes CP-violating phases in C 10 . Physics beyond the standard model can induce branching ratios of dineutrino modes Λ c → pν 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 Ξ c → Σ , Ξ c → Λ and Ω c → Ξ offer similar opportunities to test the standard model with |∆c| = |∆u| = 1 transitions.

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“…The hints of LFU violation in B decays automatically lead to a possibility of having lepton flavor violation (LFV) in B decays [18,[73][74][75][76][77]. In this work, we study the flavor violation in B → K * 2 ℓ 1 ℓ 2 , where K * 2 is a higher excited spin-2 state of K * meson.…”

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confidence: 99%

Lepton flavor violating B⃗K2*(1430)μ±τ± decays

Kumbhakar

Sain

Juhi

2023

J. Phys. G: Nucl. Part. Phys.

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A number of measurements in decays induced by the semileptonic $b\to s$ and $b\to c$ transitions hint towards a possible role of new physics in both sectors. Motivated by these anomalies, we investigate the lepton flavor violating $B\to K^*_2 (1430)\mu^{\pm}\tau^{\mp}$ decays. We calculate the two-fold angular distribution of $B\to K^*_2\ell_1\ell_2$ decay in presence of vector, axial-vector, scalar and pseudo-scalar new physics interactions. We then compute the branching fraction and lepton forward-backward asymmetry in the framework of $U^{2/3}_1$ vector leptoquark which is a viable solution to the current $B$ anomalies. We find that the upper limits are $\mathcal{B}(B\to K^*_2\mu^-\tau^+)\leq 1.64\times 10^{-7}$ and $\mathcal{B}(B\to K^*_2\mu^+\tau^-)\leq 0.60\times 10^{-7}$ at $90\%$ C.L.

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Lepton flavor violating $$\Lambda _b\rightarrow \Lambda \ell _1\ell _2$$ decay

Cited by 12 publications

References 38 publications

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

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

Probing for New Physics with Rare Charm Baryon ($Λ_c$, $Ξ_c$, $Ω_c$) Decays

Lepton flavor violating B⃗K2*(1430)μ±τ± decays

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