A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses

Bigaran, Innes; Gargalionis, John; Volkas, Raymond R.

doi:10.1007/jhep10(2019)106

Cited by 85 publications

(43 citation statements)

References 118 publications

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“…On the other hand, in Ref. [71], vectorlike-quarks ∼ð3; 2; −5=6Þ was introduced in addition to S 1 and S 3 LQs to give neutrinos nonzero masses. 4 Reference [115] first proposed neutrino mass generation at the two-loop by introducing S 1 and ω.…”

Section: The Setupmentioning

confidence: 99%

Combined explanations of (g−2)μ , RD(<

Saad

2020

Phys. Rev. D

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Motivated by the long-standing tension in the muon anomalous magnetic moment (AMM) and persistent observations of B-physics anomalies in R D ðÃÞ and R K ðÃÞ ratios, we construct a simple two-loop radiative neutrino mass model, and propose a combined explanations of all these apparently disjoint phenomena within this framework. Our proposed model consists of two scalar leptoquarks (LQs), a SUð2Þ L singlet S 1 ∼ ð3; 1; 1=3Þ and a SUð2Þ L triplet S 3 ∼ ð3; 3; 1=3Þ to accommodate R D ðÃÞ and R K ðÃÞ anomalies, respectively. The muon receives chirality-enhanced contribution toward its g − 2 due to the presence of S 1 LQ that accounts for the observed deviation from the Standard Model prediction. Furthermore, we introduce a SUð2Þ L singlet scalar diquark ω ∼ ð6; 1; 2=3Þ, which is necessary to break lepton number and generate neutrino mass radiatively with the aid of S 1 and S 3 LQs. We perform a detailed phenomenological analysis of this setup and demonstrate its viability by providing benchmark points where a fit to the neutrino oscillation data together with proper explanations of the muon AMM puzzle and flavor anomalies are accomplished while simultaneously meeting all other flavor violation and collider bounds.

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Section: The Setupmentioning

confidence: 99%

Combined explanations of (g−2)μ , RD(<

Saad

2020

Phys. Rev. D

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“…The scalars S 1 and S 3 can Yukawa-couple as leptoquarks, diquarks, as one of each, or as both. As leptoquarks, they appear together in models which tackle the flavour anomalies in the R K ( * ) and R D ( * ) observables [38][39][40][41][42]. S 1 coupling as a leptoquark is able to explain R D ( * ) (see, for example [43,44]) while S 3 coupling as a leptoquark is able explain R K ( * ) [45][46][47][48][49][50][51].…”

Section: The Modelmentioning

confidence: 99%

Radiative neutrino mass model from a mass dimension-11 ∆L = 2 effective operator

Gargalionis

Popa-Mateiu

Volkas

2020

J. High Energ. Phys.

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We present the first detailed phenomenological analysis of a radiative Majorana neutrino mass model constructed from opening up a ∆L = 2 mass-dimension-11 effective operator constructed out of standard model fields. While three such operators are generated, only one dominates neutrino mass generation, namely O 47 = L C LQ C QQQ C HH, where L denotes lepton doublet, Q quark doublet and H Higgs doublet. The underlying renormalisable theory contains the scalars S 1 ∼ (3, 1, 1/3) coupling as a diquark, S 3 ∼ (3, 3, 1/3) coupling as a leptoquark, and Φ 3 ∼ (3, 3, 2/3), which has no Yukawa couplings but does couple to S 1 and S 3 in addition to the gauge fields. Neutrino masses and mixings are generated at two-loop order. A feature of this model that is different from many other radiative models is the lack of proportionality to any quark and charged-lepton masses of the neutrino mass matrix. One consequence is that the scale of new physics can be as high as 10 7 TeV, despite the operator having a high mass dimension. This raises the prospect that ∆L = 2 effective operators at even higher mass dimensions may, when opened up, produce phenomenologically-viable radiative neutrino mass models. The parameter space of the model is explored through benchmark slices that are subject to experimental constraints from charged lepton flavour-violating decays, rare meson decays and neutral-meson mixing. The acceptable parameter space can accommodate the anomalies in R K ( * ) and the anomalous magnetic moment of the muon.

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“…While other simultaneous solutions are possible (see e.g. [31][32][33][34][35][36][37]), an explanation in terms of a JHEP10(2020)084 U 1 LQ has become even more consistent with recent data [38][39][40]. Being a massive vector boson, the U 1 requires a UV completion from which it arises either as a gauge boson of a spontaneously broken gauge symmetry or as a composite vector boson (see e.g.…”

Section: Introductionmentioning

confidence: 78%

The dark side of 4321

Guadagnoli

Reboud

Stangl

2020

J. High Energ. Phys.

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The evidence of Dark Matter (DM) is one of the strongest observational arguments in favor of physics beyond the Standard Model. Despite expectations, a similar evidence has been lacking so far in collider searches, with the possible exception of B-physics discrepancies, a coherent set of persistent deviations in a homogeneous dataset consisting of b → c and b → s semi-leptonic transitions. We explore the question whether DM and the B discrepancies may have a common origin. We do so in the context of the so-called 4321 gauge model, a UV-complete and calculable setup that yields a U1 leptoquark, the by far most successful single mediator able to explain the B anomalies, along with other new gauge bosons, including a Z′. Adding to this setup a ‘minimal’ DM fermionic multiplet, consisting of a 4 under the 4321’s SU(4), we find the resulting model in natural agreement with the relic-density observation and with the most severe direct-detection bounds, in the sense that the parameter space selected by B physics is also the one favored by DM phenomenology. The DM candidate is a particle with a mass in the WIMP range, freeze-out dynamics includes a co-annihilator (the ‘rest’ of the 4 multiplet), and the most important gauge mediator in the DM sector is the Z′.

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A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses

Cited by 85 publications

References 118 publications

Combined explanations of (g−2)μ , RD(<

Combined explanations of (g−2)μ , RD(<

Radiative neutrino mass model from a mass dimension-11 ∆L = 2 effective operator

The dark side of 4321

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