New leptons with exotic decays: collider limits and dark matter complementarity

Guedes, Guilherme; Santiago, José

doi:10.1007/jhep01(2022)111

Cited by 25 publications

(14 citation statements)

References 57 publications

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“…Vector-like leptons will be dominantly pair-produced at the LHC through the s− channel Z/γ exchange (see figure 1), and then decay to leptons and vector boson dark matter, yielding a promising pp → l + l − + / E T signature. This will resemble the signals of supersymmetric slepton searches [37][38][39] leading to dilepton and missing energy signatures. It is worth noting that the pair-production rate of vector-like leptons (fermion) in our scenario is substantially larger than the pair-production rate of slepton (scalar).…”

Section: Collider Implicationsmentioning

confidence: 81%

Vector boson dark matter from trinification

Babu

Jana

Thapa

2022

J. High Energ. Phys.

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We show how trinification models based on the gauge group SU(3)C× SU(3)L× SU(3)R realized near the TeV scale can provide naturally a variety of dark matter (DM) candidates. These models contain a discrete T parity which may remain unbroken even after spontaneous symmetry breaking. The lightest T-odd particle, which could be a fermion, a scalar, or a gauge boson, can constitute the dark matter of the universe. This framework naturally admits a doublet-singlet fermionic DM, a singlet scalar DM, or a vector boson DM. Here we develop the vector boson DM scenario wherein the DM couples off-diagonally with the usual fermions and vector-like fermions present in the theory. We show consistency of this framework with dark matter relic abundance and direct detection limits as well as LHC constraints. We derive upper limits of 900 GeV on the vector gauge boson DM mass and 4.5 TeV on the vector-like quark masses. We also show the consistency of spontaneous gauge symmetry breaking down to Standard Model times an extra U(1) while preserving the T-parity.

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Section: Collider Implicationsmentioning

confidence: 81%

Vector boson dark matter from trinification

Babu

Jana

Thapa

2022

J. High Energ. Phys.

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“…Perhaps the most obvious channel, portal matter pair production from either QCD (in the case of color-triplet portal matter) or electroweak interactions (for leptonic portal matter), has been well-explored in the perfectly analogous scenarios of [19-21, 57, 58], and summarized well in [59], so we see no need to perform the analysis again here-we shall simply quote some results and comment on their relevance in our context. In both the leptonic and quark-like portal matter cases, the pair production cross sections scale quite strongly with the portal matter mass [19,57], so for pair production searches we are especially concerned with the very lightest portal matter states that are present, even in the event of a large ensemble of portal matter states in the model, as long as there are O(1) differences in brane-localized kinetic terms (and hence masses O(1) proportional differences in masses) between portal matter states. In the event that the dark Higgs and dark photon decay invisibly (or are long-lived enough to decay outside of the detector), direct contact can be made with squark and slepton searches for jets or leptons and missing energy to find these lightest portal matter particles.…”

Section: Portal Matter and Su (2) D Bosons: Productionmentioning

confidence: 99%

Kinetic Mixing from Kaluza-Klein Modes: A Simple Construction for Portal Matter

Wojcik¹

2022

Preprint

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The vector portal/kinetic mixing simplified model of dark matter, in which thermal dark matter of a mass ranging from a few MeV to a few GeV can be realized in association with a dark-sector U (1), relies on the appearance of a small kinetic mixing term between this dark U (1) and the Standard Model (SM) hypercharge. It is well-known that kinetic mixing of the appropriate magnitude can be generated at one loop by the inclusion of "portal matter" fields which are charged under both the dark U (1) and the SM hypercharge, and it has been previously argued on phenomenological grounds that fermionic portal matter fields must exhibit a very specific set of characteristics: They must be vector-like and have the same Standard Model group representations as existing SM fermions. A natural explanation for the presence of dark U (1)-charged copies of SM fermions would be to enlarge the dark gauge group and embed the SM and the portal matter into a single dark multiplet, however, previous attempts at accomplishing this task require significant ad hoc additions to the model to ensure that the portal matter fields are vector-like while the SM fields are chiral, and rely on complicated dark Higgs sectors to realize the appropriate symmetry breaking. In this paper, we argue that embedding a portal matter model in extra dimensions can easily generate chiral SM fermions and vector-like portal matter from a single dark bulk multiplet, while allowing for a far simpler dark Higgs sector. We present a minimal construction of this "Kaluza-Klein portal matter" and explore its phenomenology at the LHC, noting that even in our simple realization of the paradigm such a construction exhibits phenomenology unique from that of more conventional theories of large extra dimensions and 4-dimensional models of portal matter.

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“…We have discussed in section 5.4 how CLFV processes constrain typical values of the Yukawa couplings Ỹ E i of the NB-VLL with the SM and have seen that the no observation of µ → e flavor change leads 10 A recent reanalysis can be seen in ref. [63]. 11 We roughly projected on the 95% CL region with 2 dgf.…”

Section: Parameter Spacementioning

confidence: 99%

Leptonic CP violation from a vector-like lepton

Cherchiglia

Conto

Nishi

2022

J. High Energ. Phys.

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Leptonic CP violation is yet to be confirmed as an additional source of CP violation in fundamental interactions. We study the case where leptonic CP violation is spontaneous and is induced by the mixing with a heavy charged vector-like lepton (VLL). We show that the non-decoupling of this VLL is linked with the presence of CP violation and its coupling with the SM leptons are partly fixed from the SM Yukawas. Due to the large leptonic mixing angles, these couplings are typically of the same order and there is no flavor preference. Strong but not definitive constraints come from charged lepton flavor violating processes because the VLL can decouple from one or two leptonic flavors in very special points of parameter space. These special points are very sensitive to the neutrino Majorana phases.

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New leptons with exotic decays: collider limits and dark matter complementarity

Cited by 25 publications

References 57 publications

Vector boson dark matter from trinification

Vector boson dark matter from trinification

Kinetic Mixing from Kaluza-Klein Modes: A Simple Construction for Portal Matter

Leptonic CP violation from a vector-like lepton

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