New physics pathways from B processes

D'Alise, Alessandra; Fabiano, Giuseppe; Frattulillo, Domenico; Iacobacci, Davide; Sannino, Francesco; Santorelli, Pietro; Vignaroli, Natascia

doi:10.1016/j.nuclphysb.2024.116631

Nuclear Physics B

2024

DOI: 10.1016/j.nuclphysb.2024.116631

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New physics pathways from B processes

Alessandra D'Alise,

Giuseppe Fabiano,

Domenico Frattulillo

et al.

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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
1
0
0
0
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Implications of $$B \rightarrow K \nu {\bar{\nu }}$$ under rank-one flavor violation hypothesis

Marzocca,

Nardecchia,

Stanzione

et al. 2024

Eur. Phys. J. C

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We study the implications of the observed excess in $$B^+ \rightarrow K^+ \nu \bar{\nu }$$ B + → K + ν ν ¯ under the assumption of Rank-One Flavour Violation, i.e. that New Physics couples to a single specific direction in flavour space. By varying this direction we perform analyses at the level of the low-energy EFT, the SMEFT, and with explicit mediators such as leptoquarks and colorless vectors ($$Z^\prime $$ Z ′ and $$V^\prime $$ V ′ ). We study correlations with other flavour, electroweak and collider observables, finding that the most interesting ones are with $$K \rightarrow \pi \nu \bar{\nu }$$ K → π ν ν ¯ , $$B_s \rightarrow \mu ^+ \mu ^-$$ B s → μ + μ - , meson mixing and the LHC searches in $$\tau ^+ \tau ^-$$ τ + τ - high-energy tails. Among the various mediators, the scalar leptoquarks $$\tilde{R}_2$$ R ~ 2 and $$S_1$$ S 1 offer the best fits of the Belle-II excess, while being consistent with the other bounds. On the other hand, colorless vectors are strongly constrained by meson mixing and resonance searches in $$p p \rightarrow \tau ^+ \tau ^-$$ p p → τ + τ - . In all cases we find that a flavour alignment close to the third generation is generically preferred.

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New physics pathways from B processes

Cited by 2 publications

References 56 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
1
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
1
0
0
0
View full text Add to dashboard Cite

Implications of $$B \rightarrow K \nu {\bar{\nu }}$$ under rank-one flavor violation hypothesis

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New physics pathways from B processes

Cited by 2 publications

References 56 publications

Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*Alok, Chundawat, Kumar et al. 2024Phys. Rev. D1000View 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. D1000View full textAdd to dashboardCite

Implications of $$B \rightarrow K \nu {\bar{\nu }}$$ under rank-one flavor violation hypothesis

Contact Info

Product

Resources

About

Genuine lepton-flavor-universality-violating observables in the τ−μ sector of B→(K,K*
Alok,
Chundawat,
Kumar
et al. 2024
Phys. Rev. D
1
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
1
0
0
0
View full text Add to dashboard Cite