Supersymmetric type-III seesaw mechanism: Lepton flavor violation and LHC phenomenology

Hirsch, Martin; Porod, W.; Weiß, Christof; Staub, Florian

doi:10.1103/physrevd.87.013010

Cited by 8 publications

(9 citation statements)

References 134 publications

(201 reference statements)

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“…LFV violating observables have been intensively discussed in supersymmetric high-scale seesaw models [13][14][15][16][17][18][19][20][21][22][24][25][26]. In view of the above-mentioned controversy, we focus on the Z-penguin and, in particular, on the chargino-sneutrino contributions.…”

Section: Revising the 1-loopmentioning

confidence: 99%

Decoupling of heavy sneutrinos in low-scale seesaw models

et al. 2014

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There have been some recent claims in the literature about large right-handed sneutrinos contributions to lepton flavor violating observables like μ → 3e or μ − e conversion in nuclei in supersymmetric low-scale seesaw models. These large contributions originate from Z-penguin diagrams which show a much weaker dependence on the heavy masses than the photonic contributions. We have traced this to an error in the evaluation of the corresponding loop amplitudes which has propagated in the literature. We explicitly show that after correcting this mistake the Z-penguins show the expected decoupling behavior. Moreover, the reported dominance of the Z-penguin over the photonic contributions disappears as well.

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Section: Revising the 1-loopmentioning

confidence: 99%

Decoupling of heavy sneutrinos in low-scale seesaw models

et al. 2014

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“…The other two seesaw variants have received much less attention. The LFV phenomenology of the SUSY type-II seesaw has been considered in [60,[76][77][78][79][80][81], whereas the SUSY type-III seesaw has been studied in [82][83][84]. More recently, the interplay between the Higgs mass constraint and LFV was studied in [62] for the three seesaw variants.…”

Section: Standard High-scale Seesaw Scenariosmentioning

confidence: 99%

Lepton Flavor Violation beyond the MSSM

Vicente

2015

Advances in High Energy Physics

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Most extensions of the Standard Model lepton sector predict large lepton flavor violating rates. Given the promising experimental perspectives for lepton flavor violation in the next few years, this generic expectation might offer a powerful indirect probe to look for new physics. In this review we will cover several aspects of lepton flavor violation in supersymmetric models beyond the Minimal Supersymmetric Standard Model. In particular, we will concentrate on three different scenarios: high-scale and low-scale seesaw models as well as models with R-parity violation. We will see that in some cases the LFV phenomenology can have characteristic features for specific scenarios, implying that dedicated studies must be performed in order to correctly understand the phenomenology in non-minimal supersymmetric models.

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“…In this case, the large mixing of neutrino families required by the data also implies that charged LFV may occur at enhanced rates for sufficiently small JHEP09(2020)197 soft supersymmetry-breaking masses. This can occur in rare decays and conversions (e.g., µ → eγ and τ → µγ, µ → 3e, τ → eγ and µ − e conversion [22,23]), 1 but also in other processes such as sparticle production at the LHC [26][27][28][29][30][31][32][33][34][35][36] and slepton pair production at a Linear Collider (LC) [37][38][39][40][41][42][43][44][45], particularly in the decays of the second-lightest neutralino.…”

Section: Introductionmentioning

confidence: 99%

Confronting grand unification with lepton flavour violation, dark matter and LHC data

Ellis

Gómez

Lola

et al. 2020

J. High Energ. Phys.

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We explore possible signatures for charged lepton flavour violation (LFV), sparticle discovery at the LHC and dark matter (DM) searches in grand unified theories (GUTs) based on SU(5), flipped SU(5) (FSU(5)) and SU(4)c×SU(2)L×SU(2)R (4-2-2). We assume that soft supersymmetry-breaking terms preserve the group symmetry at some high input scale, and focus on the non-universal effects on different matter representations generated by gauge interactions at lower scales, as well as the charged LFV induced in Type-1 see-saw models of neutrino masses. We identify the different mechanisms that control the relic DM density in the various GUT models, and contrast their LFV and LHC signatures. The SU(5) and 4-2-2 models offer good detection prospects both at the LHC and in LFV searches, though with different LSP compositions, and the SU(5) and FSU(5) models offer LFV within the current reach. The 4-2-2 model allows chargino and gluino coannihilations with neutralinos, and the former offer good detection prospects for both the LHC and LFV, while gluino coannihilations lead to lower LFV rates. Our results indicate that LFV is a powerful tool that complements LHC and DM searches, providing significant insights into the sparticle spectra and neutrino mass parameters in different models.

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Supersymmetric type-III seesaw mechanism: Lepton flavor violation and LHC phenomenology

Cited by 8 publications

References 134 publications

Decoupling of heavy sneutrinos in low-scale seesaw models

Decoupling of heavy sneutrinos in low-scale seesaw models

Lepton Flavor Violation beyond the MSSM

Confronting grand unification with lepton flavour violation, dark matter and LHC data

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