Neutrino mass induced radiatively by supersymmetric leptoquarks

Chua, Chun-Khiang; He, Xiao‐Gang; Hwang, W. Y. P.

doi:10.1016/s0370-2693(00)00325-7

Cited by 28 publications

(32 citation statements)

References 26 publications

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“…This is in agreement with the findings we presented in section 5.3. Note that the neutrino Majorana masses could also receive partial contribution through the one-loop processes, where the particles in the loop are down-quarks and a mixture of S 3 andR 2 [52,94,95].…”

Section: Jhep10(2017)188mentioning

confidence: 99%

The role of the S 3 GUT leptoquark in flavor universality and collider searches

Doršner

Fajfer

Faroughy

et al. 2017

J. High Energ. Phys.

104

110

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Abstract:We investigate the ability of the S 3 scalar leptoquark to address the recent hints of lepton universality violation in B meson decays. The S 3 leptoquark with quantum numbers (3, 3, 1/3) naturally emerges in the context of an SU(5) GUT model without any conflict with the stringent limits from observed nucleon stability. Scalar leptoquark S 3 with left-handed couplings to 2nd and 3rd generations of charged leptons and down-type quarks seems well-suited to address both R K ( * ) and R D ( * ) . We quantify this suitability with numerical fits to a plethora of relevant flavor observables. The proposed SU(5) model calls for a second leptoquark state, i.e.,R 2 with quantum numbers (3, 2, 1/6), if one is to generate gauge coupling unification and neutrino mass. We accordingly include it in our study to investigateR 2 's ability to offset adverse effects of S 3 and thus improve a quality of numerical fits. A global fit of the leptoquark Yukawa couplings shows that large couplings of light S 3 to τ leptons are preferred. We furthermore identify B → K ( * )ν ν as the most sensitive channel to probe the preferred region of parameter space. Large couplings of S 3 to τ leptons are finally confronted with the experimental searches for τ final states at the Large Hadron Collider. These searches comprise a study of decay products of the leptoquark pair production, as well as, and more importantly, an analysis of the high-mass τ τ final states.

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Section: Jhep10(2017)188mentioning

confidence: 99%

The role of the S 3 GUT leptoquark in flavor universality and collider searches

Doršner

Fajfer

Faroughy

et al. 2017

J. High Energ. Phys.

104

110

View full text Add to dashboard Cite

show abstract

“…They can thus yield novel physical processes such as proton decay or help explain experimentally observed phenomena that cannot be successfully addressed within the Standard Model (SM) of elementary particle physics. For example, neutrino masses of Majorana nature can be generated through the one-loop level processes if one introduces at least two particular scalar LQ multiplets [1,2] to the SM particle content. It is our intention to investigate the viability of this particular mechanism within a context of grand unification.…”

Section: Introductionmentioning

confidence: 99%

“…For exhaustive lists of references on the LQ phenomenology one can consult reviews on the subject [7][8][9][10] or turn to the numerous studies of specific aspects of the LQ related physics [11][12][13][14][15][16][17]. The one-loop contributions towards neutrino masses that we study have been considered extensively in the literature [1,2,[18][19][20][21][22]. Our intention, in contrast to the existing studies, is to analyse possibilities to have a more fundamental origin of this mechanism and to provide several realistic examples.…”

Section: Introductionmentioning

confidence: 99%

Leptoquark mechanism of neutrino masses within the grand unification framework

2017

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We demonstrate the viability of the one-loop neutrino mass mechanism within the framework of grand unification when the loop particles comprise scalar leptoquarks (LQs) and quarks of the matching electric charge. This mechanism can be implemented in both supersymmetric and nonsupersymmetric models and requires the presence of at least one LQ pair. The appropriate pairs for the neutrino mass generation via the up-type and down-type quark loops are S 3 -R 2 and S 1, 3 -R 2 , respectively. We consider two distinct regimes for the LQ masses in our analysis. The first regime calls for very heavy LQs in the loop. It can be naturally realized with the S 1, 3 -R 2 scenarios when the LQ masses are roughly between 10 12 and 5 × 10 13 GeV. These lower and upper bounds originate from experimental limits on partial proton decay lifetimes and perturbativity constraints, respectively. Second regime corresponds to the collider accessible LQs in the neutrino mass loop. That option is viable for the S 3 -R 2 scenario in the models of unification that we discuss. If one furthermore assumes the presence of the type II seesaw mechanism there is an additional contribution from the S 3 -R 2 scenario that needs to be taken into account beside the type II see-saw contribution itself. We provide a complete list of renormalizable operators that yield necessary mixing of all aforementioned LQ pairs using the language of SU (5). We furthermore discuss several possible embeddings of this mechanism in SU (5) and SO(10) gauge groups. a

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“…They can thus yield novel physical processes that are not present in the Standard Model (SM) of elementary particle physics 1 . One such process is a generation of neutrino masses of Majorana nature at the one-loop level that requires addition of at least two particular scalar LQ multiplets [2,3] to the SM particle content. This type of the one-loop contributions towards neutrino mass has been extensively studied in the literature [2,3,4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…One such process is a generation of neutrino masses of Majorana nature at the one-loop level that requires addition of at least two particular scalar LQ multiplets [2,3] to the SM particle content. This type of the one-loop contributions towards neutrino mass has been extensively studied in the literature [2,3,4,5,6,7,8]. The aim of this work is to provide a viable SU(5) origin [9] of the oneloop mechanism of the neutrino mass generation when the particles in the loop are the down-type quarks and two scalar LQs.…”

Section: Introductionmentioning

confidence: 99%

One-loop neutrino mass in $SU(5)$

Doršner¹

2017

Proceedings of Corfu Summer Institute 2016 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2016)

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I demonstrate viability of the one-loop neutrino mass mechanism within the SU(5) grand unification framework when the loop particles comprise two particular pairs of scalar leptoquarks (LQs) and the down-type quarks. The LQ multiplet components that propagate in the loop should mix for the mechanism to work. I accordingly classify all SU(5) invariant operators that can yield the required mixing. If the LQs mediate proton decay at the tree-level the neutrino mass mechanism can only be viable when the LQ masses reside in a very narrow range between 10 12 GeV and 5 × 10 13 GeV. I also present one realistic SU(5) set-up where the LQs in the neutrino mass loop are collider accessible.

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Neutrino mass induced radiatively by supersymmetric leptoquarks

Cited by 28 publications

References 26 publications

The role of the S 3 GUT leptoquark in flavor universality and collider searches

The role of the S 3 GUT leptoquark in flavor universality and collider searches

Leptoquark mechanism of neutrino masses within the grand unification framework

One-loop neutrino mass in $SU(5)$

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