New physics analysis of baryonic 
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 decays with dileptons or dineutrinos in the final state within the SMEFT framework

Das, Nilakshi; Dutta, Rupak

doi:10.1103/physrevd.108.095051

Phys. Rev. D

2023

DOI: 10.1103/physrevd.108.095051

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New physics analysis of baryonic Λb decays with dileptons or dineutrinos in the final state within the SMEFT framework

Nilakshi Das,

Rupak Dutta

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Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
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It was previously shown that unlike the ratios RKμe≡RK≡Γ(B→Kμ+μ−)/Γ(B→Ke+e−) and RK*μe≡RK*≡Γ(B→K*μ+μ−)/Γ(B→K*e+e−), the ratios RKτμ and RK*τμ can deviate from their Standard Model (SM) predictions even with universal new physics couplings. This observation highlights the critical need to identify and establish genuine lepton flavor universality violating (LFUV) observables in the τ−μ sector. This work embarks on establishing genuine LFUV ratio observables in B→Kℓℓ and B→K*ℓℓ decays through comprehensive analysis of their angular distributions. We find that like RK*τμ, the ratios RAFBτμ and RfLτμ do not qualify as genuine LFUV observables, whereas the ratios of all optimized observables in B→K*ℓℓ decays within the τ−μ sector definitively do. In the case of B→Kℓℓ decays, similar to RKτμ, the ratio RFH is influenced by mass effects and therefore cannot be considered a genuine LFUV observable in the τ−μ sector. However, the ratio Γτ(1−FHτ)/Γμ(1−FHμ) stands as the sole genuine LFUV observable in B→Kℓℓ decays. Furthermore, by making use of new physics Lorentz structures which provide a better fit to the current b→sℓℓ data as compared to the SM, we demonstrate how the nongenuine LFUV ratios RAFBτμ and RfLτμ can be employed to distinguish between framework with solely universal lepton couplings and those with both universal and nonuniversal couplings. Published by the American Physical Society 2024

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Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
0
0
0
0
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New physics analysis of baryonic Λb decays with dileptons or dineutrinos in the final state within the SMEFT framework

Cited by 1 publication

References 90 publications

Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
0
0
0
0
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Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
0
0
0
0
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New physics analysis of baryonic Λb decays with dileptons or dineutrinos in the final state within the SMEFT framework

Cited by 1 publication

References 90 publications

Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*Alok, Chundawat, Kumar et al. 2024Phys. Rev. D0000View full textAdd to dashboardCite

Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*Alok, Chundawat, Kumar et al. 2024Phys. Rev. D0000View full textAdd to dashboardCite

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Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
0
0
0
0
View full text Add to dashboard Cite

Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
0
0
0
0
View full text Add to dashboard Cite