Electroweak-flavour and quark-lepton unification: a family non-universal path

Davighi, Joe; Isidori, Gino; Pesut, Marko

doi:10.1007/jhep04(2023)030

Cited by 18 publications

(6 citation statements)

References 36 publications

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“…This information is very powerful. For instance, if the appropriate bordism group vanishes, we immediately learn that there can be no global anomaly associated with any symmetry transformation, for any spacetime geometry and background field configuration [27,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Omega vs. pi, and 6d anomaly cancellation

Davighi

Lohitsiri

2021

J. High Energ. Phys.

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In this note we review the role of homotopy groups in determining non-perturbative (henceforth ‘global’) gauge anomalies, in light of recent progress understanding global anomalies using bordism. We explain why non-vanishing of πd(G) is neither a necessary nor a sufficient condition for there being a possible global anomaly in a d-dimensional chiral gauge theory with gauge group G. To showcase the failure of sufficiency, we revisit ‘global anomalies’ that have been previously studied in 6d gauge theories with G = SU(2), SU(3), or G2. Even though π6(G) ≠ 0, the bordism groups $$ {\Omega}_7^{\mathrm{Spin}}(BG) $$ Ω 7 Spin BG vanish in all three cases, implying there are no global anomalies. In the case of G = SU(2) we carefully scrutinize the role of homotopy, and explain why any 7-dimensional mapping torus must be trivial from the bordism perspective. In all these 6d examples, the conditions previously thought to be necessary for global anomaly cancellation are in fact necessary conditions for the local anomalies to vanish.

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Section: Introductionmentioning

confidence: 99%

Omega vs. pi, and 6d anomaly cancellation

Davighi

Lohitsiri

2021

J. High Energ. Phys.

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“…[10]). While none of the hints is particularly compelling nowadays, the model-building efforts presented in [11][12][13][14][15][16][17][18] are interesting examples of the possibility to accomodate low-scale NP via non-universal gauge interactions connected to the origin of the fermion mass hierarchies.…”

Section: Jhep05(2024)033mentioning

confidence: 99%

Minimal flavour deconstruction

Barbieri,

Isidori

2024

J. High Energ. Phys.

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We construct two concrete examples of flavour non-universal gauge theories which, after the inclusion of all d ≤ 4 gauge invariant operators, allow to describe the observed pattern of flavour in the charged fermion sector without any small Yukawa coupling (y ≳ 0.1). Guided by the criterium of minimality, we assume that flavour non universality is confined to the Abelian sector of the gauge group: the universal hypercharge emerges after a sequence of symmetry-breaking steps characterised by two high mass scales, Λ[23]< Λ[12], where the second and the first fermion generations get their mass respectively. At least in one of the two models the smaller of these scales can be in the 10 TeV range, consistently with current bounds from flavour observables. Both models are extended to include as well neutrino masses and mixings.

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“…A well motivated embedding for gauge U 1 leptoquarks is the Pati-Salam group [38], that provides a natural connection with quark-lepton unification. Moreover, explanations of the R D ( * ) anomalies via exchange of the U 1 vector leptoquark had been shown to be naturally connected with the origin of flavour hierarchies and the flavour structure of the SM [39][40][41][42][43][44][45]. Remarkably, the contributions of the U 1 vector leptoquark to R D ( * ) are correlated to an enhancement of b → sτ τ .…”

Section: The Vector Leptoquarkmentioning

confidence: 99%

“…is a good benchmark for 4321 models featuring TeV scale third family quark-lepton unification [30][31][32]39,42,43], while the case C 23τ τ L R = 0 is a good benchmark for the flavour universal 4321 model [35,36,44,45]. Given that U 1 is a vector leptoquark, the leading contribution to M s arising at 1-loop depends on the specific UV completion.…”

Section: The Vector Leptoquarkmentioning

confidence: 99%

$$\tau _{B_{s}}/\tau _{B_{d}}$$ and $$\Delta \Gamma _{s}$$ confront new physics in $$b\rightarrow s\tau \tau $$

Bordone,

Navarro

2023

Eur. Phys. J. C

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Several new physics scenarios that address anomalies in B-physics predict an enhancement of $$b \rightarrow s \tau \tau $$ b → s τ τ with respect to its Standard Model prediction. Such scenarios necessarily imply modifications of the lifetime ratio $$\tau _{B_{s}}/\tau _{B_{d}}$$ τ B s / τ B d and the lifetime difference $$\Delta \Gamma _{s}$$ Δ Γ s . In this work, we explore indirect bounds provided by these observables over new physics scenarios. We also estimate future projections, showing that future experimental and theoretical improvements on both $$\tau _{B_{s}}/\tau _{B_{d}}$$ τ B s / τ B d and $$\Delta \Gamma _{s}$$ Δ Γ s have the potential to provide bounds competitive with those directly extracted from $$b\rightarrow s \tau \tau $$ b → s τ τ transitions. After performing a model-independent analysis, we apply our results to the particular case of leptoquark mediators proposed to address the $$R_{D^{(*)}}$$ R D ( ∗ ) anomalies.

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Electroweak-flavour and quark-lepton unification: a family non-universal path

Cited by 18 publications

References 36 publications

Omega vs. pi, and 6d anomaly cancellation

Omega vs. pi, and 6d anomaly cancellation

Minimal flavour deconstruction

$$\tau _{B_{s}}/\tau _{B_{d}}$$ and $$\Delta \Gamma _{s}$$ confront new physics in $$b\rightarrow s\tau \tau $$

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