Radiatively Induced Type II seesaw and Vector-like 5/3 Charge Quarks

Abstract

Understanding small neutrino masses in type II seesaw models with TeV scale SM triplet Higgs bosons requires that its coupling with the standard model Higgs doublet H be dialed down to be order eV to KeV, which is a fine-tuning by a factor of $10^{-11}-10^{-8}$ with respect to the weak scale. We present a SUSY extension of the type II seesaw model where this dimensionful small coupling is radiatively induced, thus making its smallness natural. This model has an exotic vector-like quark doublet which contains a quark X with electric charge 5/3 and a top partner t'. We discuss in details the phenomenology of the model paying special attention to the consequences of the interactions of the the exotic heavy quarks and the scalars of the model. Implications for neutrinoless double beta decay and for the LHC experiments are discussed in detail. Remarkably, in this model both the seesaw triplet and the heavy quarks can manifest at colliders in a host of different signatures, including some that significantly differ from those of the minimal models. Depending on the choice of the hierarchy of couplings, the decay of the heavy quarks and of the seesaw triplet may be subject to bounds that can be tighter or looser than the bounds from standard LHC searches. Furthermore we point out a new short-distance contribution to neutrinoless double beta decay mediated by the simultaneous propagation of the type II triplet and exotic fermions. Remarkably this contribution to the neutrinoless double beta decay is parametrically quite independent from the scale of the generated neutrino mass.

25 pages, 2 figures

References in corpus (25)

• Light custodians in natural composite Higgs models
• A handbook of vector-like quarks: mixing and single production
• Neutrino Masses and the LHC: Testing Type II Seesaw
• Model Independent Framework for Searches of Top Partners
• A search for a doubly-charged Higgs boson in pp collisions at sqrt(s) = 7 TeV
• A Survey of Lepton Number Violation Via Effective Operators
• Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and Signals at the LHC
• Probing Majorana Phases and Neutrino Mass Spectrum in the Higgs Triplet Model at the LHC
• Neutrino mass hierarchy and Majorana CP phases within the Higgs triplet model at the LHC
• Direct determination of neutrino mass parameters at future colliders
• Testing neutrino masses in little Higgs models via discovery of doubly charged Higgs at LHC
• Origin of neutrino masses at the LHC: Delta L = 2 effective operators and their ultraviolet completions
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• Correlative signatures of heavy Majorana neutrinos and doubly-charged Higgs bosons at the Large Hadron Collider
• Search for pair produced fourth-generation up-type quarks in pp collisions at sqrt(s) = 7 TeV with a lepton in the final state
• Higgs Mass Bounds, Type II SeeSaw and LHC
• Same-Sign Tetra-Leptons from Type II Seesaw
• Search for heavy quarks decaying into a top quark and a W or Z boson using lepton + jets events in pp collisions at sqrt(s) = 7 TeV
• Search for W' boson production in the W'->tb decay channel
• The Natural Composite Higgs
• Signals of Doubly-Charged Higgsinos at the CERN Large Hadron Collider
• Exotic Top Partners and Little Higgs
• New Signals for Doubly-Charged Scalars and Fermions at the Large Hadron Collider
• LHC signatures of vector-like quarks
• Neutrinoless double $\beta$ decay with small neutrino masses

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• From the trees to the forest: a review of radiative neutrino mass models
• LHC bounds on Lepton Number Violation mediated by doubly and singly-charged scalars
• Doubly charged heavy leptons at LHC via contact interactions
• Exotic leptons at future linear colliders
• Distinguishing between lepton number violating scalars at the LHC
• Inverse type II seesaw mechanism and its signature at the LHC and ILC
• Neutrino masses from SUSY breaking in radiative seesaw models
• Two-loop radiative seesaw, muon $g-2$, and $\tau$-lepton-flavor violation with DM constraints
• Radiatively scotogenic type-II seesaw and a relevant phenomenological analysis
• Search for single production of vector-like quarks decaying into $W(\ell \nu )b$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector