A nonunitary interpretation for a single vector leptoquark combined explanation to the B-decay anomalies

Hati, Chandan; Kriewald, J.; Orloff, J.; Teixeira, Ana

doi:10.1007/jhep12(2019)006

Cited by 25 publications

(15 citation statements)

References 259 publications

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“…which we have explicitly written the sums over flavour and mass eigenstates (9 charged lepton mass eigenstates, and 12 neutral states). The (not necessarily unitary[129][130][131][132][133]) Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix corresponds to the upper 3…”

mentioning

confidence: 99%

Anomalies in 8Be nuclear transitions and (g − 2)e,μ: towards a minimal combined explanation

Hati

Kriewald

Orloff

et al. 2020

J. High Energ. Phys.

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Motivated by a simultaneous explanation of the apparent discrepancies in the light charged lepton anomalous magnetic dipole moments, and the anomalous internal pair creation in 8 Be nuclear transitions, we explore a simple New Physics model, based on an extension of the Standard Model gauge group by a U(1) B−L. The model further includes heavy vector-like fermion fields, as well as an extra scalar responsible for the low-scale breaking of U(1) B−L , which gives rise to a light Z boson. The new fields and currents allow to explain the anomalous internal pair creation in 8 Be while being consistent with various experimental constraints. Interestingly, we find that the contributions of the Z and the new U(1) B−L-breaking scalar can also successfully account for both (g−2) e,µ anomalies; the strong phenomenological constraints on the model's parameter space ultimately render the combined explanation of (g − 2) e and the anomalous internal pair creation in 8 Be particularly predictive. The underlying idea of this minimal "prototype model" can be readily incorporated into other protophobic U(1) extensions of the Standard Model.

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mentioning

confidence: 99%

Anomalies in 8Be nuclear transitions and (g − 2)e,μ: towards a minimal combined explanation

Hati

Kriewald

Orloff

et al. 2020

J. High Energ. Phys.

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“…In order to accommodate the anomalous data in -meson decays, the LQ couplings are required to exhibit a particular flavour pattern, which in turn leads to sizeable charged lepton flavour violation (cLFV) rates. As it turns out, the experimental bounds on cLFV processes can be respected if the (3 × 3) coupling matrix is non-unitary [7]. Non-unitary couplings (to SM fermions) can be achieved by mixings of SM fermions with additional vector-like fermions.…”

Section: Non-unitary Couplingsmentioning

confidence: 99%

“…A combined explanation of the anomalies with a single vector LQ as for instance the constraints on the boson LFU ratios and cLFV decay modes. In particular, only vector-like (2) doublets allow to circumvent otherwise excessive corrections to the − ℓℓ ( ) tree-level couplings, as emphasised in [7].…”

Section: Pos(ichep2020)258mentioning

confidence: 99%

A combined explanation of the $B$-decay anomalies with a single vector leptoquark

Kriewald¹,

Hati²,

Orloff³

et al. 2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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Motivated by the recent experimental progress on the (*) and (*) anomalies in-decays, we consider an extension of the Standard Model by a single vector leptoquark field. We study how one can achieve the required lepton flavour non-universality, starting from a priori universal gauge couplings. While the unitary coupling flavour structure, induced by the mass misalignment of quarks and leptons after (2) breaking, does not allow to comply with stringent bounds from lepton flavour violating processes, we find that effectively non-unitary couplings, due to mixings with heavy vector-like fermions, hold the key to simultaneously address the (*) and (*) anomalies. Furthermore, in the near future, the expected progress in the sensitivity on charged lepton flavour violating observables should allow to probe a large region of the preferred parameter space in this class of vector leptoquark models.

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“…A new physics solution is needed to explain them simultaneously. A few possible solutions in other contexts have been considered in literature [14,[96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111].…”

Section: The Muon and Electron Anomalous Magnetic Momentsmentioning

confidence: 99%

Explaining (g−2)μ,e , the KOTO anomaly, and the MiniBooNE excess in an extended Higgs model with sterile neutrinos

Dutta

Ghosh

2020

Phys. Rev. D

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We consider a simple extension of the Standard Model (SM) by a complex scalar doublet and a singlet along with three sterile neutrinos. The sterile neutrinos mix with the SM neutrinos to produce three light neutrino states consistent with the oscillation data and three heavy sterile states. The lightest sterile neutrino has lifetime longer than the age of the Universe and can provide correct dark matter relic abundance. Utilizing tree-level flavor changing interactions of a light scalar with mass ∼Oð100Þ MeV along with sterile neutrinos, we can explain the anomalous magnetic moments of both muon and electron, KOTO anomalous events and the MiniBooNE excess simultaneously.

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A nonunitary interpretation for a single vector leptoquark combined explanation to the B-decay anomalies

Cited by 25 publications

References 259 publications

Anomalies in 8Be nuclear transitions and (g − 2)e,μ: towards a minimal combined explanation

Anomalies in 8Be nuclear transitions and (g − 2)e,μ: towards a minimal combined explanation

A combined explanation of the $B$-decay anomalies with a single vector leptoquark

Explaining (g−2)μ,e , the KOTO anomaly, and the MiniBooNE excess in an extended Higgs model with sterile neutrinos

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