Multilepton dark matter signals

Aguilar-Saavedra, J. A.; Casas, J.A.; Quilis, Jordi; Austri, Roberto Ruiz de

doi:10.1007/jhep04(2020)069

“…However, in regions of the parameter space where the singlets ξ are lighter than m Z /2, they could be produced in Z decays. The decay Z → ξ2 ξ2 with subsequent decay ξ2 → ξ1 + − produces two pairs of collimated leptons, which can give striking signatures [89]. Other decay modes such as ξ2 → ξ1 q q are likely unobservable, as are the decays Z → ξ1 ξ1 .…”

Section: Discussionmentioning

confidence: 99%

WIMP Dark Matter in the U$μν$SSM

Aguilar-Saavedra,

López-Fogliani,

Muñoz

et al. 2021

Preprint

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The UµνSSM is a U (1) extension of the µνSSM supersymmetric model, where baryon-number-violating operators as well as explicit mass terms are forbidden, and the potential domain wall problem is avoided. The gauge anomaly-cancellation conditions impose the presence of exotic quark superfields in the spectrum of UµνSSM models, and allow the presence of several singlet superfields under the standard model gauge group, in addition to the right-handed neutrino superfields. The gauge structure implies an additional discrete Z 2 symmetry in the superpotential, ensuring the stability of a singlet which behaves as WIMP dark matter without invoking R-parity. We analyze this novel possibility in detail, using the fermionic component of the singlet as the dark matter candidate. In particular, we compute its amount of relic density via Z , Higgs-right sneutrino and dark matter mediated annihilations, and its potential signals in dark matter direct detection experiments. The constraints on the parameter space due to Z direct searches at the LHC are imposed in the analysis, as well as those from the hadronization inside the detector of the exotic quarks. Large regions of the parameter space turn out to be in the reach of the upcoming Darwin experiment.

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“…From the results in Ref. [81], one can see that there are regions in the parameter space where the Z -mediated signals are more significant than the direct production ofχ ± 1,2 and χ 0 2 pairs. • Z →χ + 1χ − 1 ,χ 0 2χ 0 2 with the same decaysχ ± 1 → ± νχ 0 1 ,χ 0 2 → + −χ 0 1 and RPV decaysχ 0 1 → + − ν, qq with a displaced vertex [82].…”

Section: Phenomenological Prospectsmentioning

confidence: 98%

$$U(1)'$$ extensions of the $$\mu \nu \mathrm{SSM}$$

Aguilar-Saavedra

¹

,

Lara

²

,

López-Fogliani

³

et al. 2021

Eur. Phys. J. C

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In the $$\mu \nu $$ μ ν SSM, the presence of R-parity violating couplings involving right-handed (RH) neutrinos solves simultaneously the $$\mu $$ μ - and $$\nu $$ ν -problems. We explore extensions of the $$\mu \nu $$ μ ν SSM adding a $$U(1)'$$ U ( 1 ) ′ gauge group, which provides the RH neutrinos with a non-vanishing charge. In these models, dubbed U$$\mu \nu $$ μ ν SSM, the anomaly cancellation conditions impose the presence of exotic quarks in the spectrum that are vector-like under the standard model (SM) gauge group: either three pairs SU(2) quark singlets, or a pair of quark singlets together with a pair of quark doublets. Several singlets under the SM group can also be present, with the $$U(1)'$$ U ( 1 ) ′ charges making distinctions among them, and therefore allowing different types of couplings. Some of these singlets dynamically generate Majorana masses for the RH neutrinos, and others can be candidates for dark matter. The useful characteristics of models with $$U(1)'$$ U ( 1 ) ′ s are also present in U$$\mu \nu $$ μ ν SSM models: baryon-number-violating operators as well as explicit Majorana masses and $$\mu $$ μ terms are forbidden, and the domain wall problem is avoided. The phenomenology of U$$\mu \nu $$ μ ν SSM models is very rich. We analyze the experimental constraints on their parameter space, specially on the mass and mixing of the new $$Z'$$ Z ′ boson. In addition to the exotic quarks, which can hadronize inside the detector or decay producing SM particles, the U$$\mu \nu $$ μ ν SSM models can also have new signals such as decays of the $$Z'$$ Z ′ to sparticle pairs like right sneutrinos, charginos or neutralinos. Besides, $$Z'$$ Z ′ and Higgs mediated annihilations and interactions with the visible sector of WIMP dark matter particles, can also be present.

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“…From the results in Ref. [75], one can see that there are regions in the parameter space where the Z ′ -mediated signals are more significant than the direct production of χ± 1,2 and χ0 2 pairs. •…”

Section: Phenomenological Prospectsmentioning

confidence: 98%

$U(1)'$ extensions of the $μν$SSM

Aguilar-Saavedra¹,

Lara²,

López-Fogliani³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

In the µνSSM, the presence of R-parity violating couplings involving right-handed (RH) neutrinos solves simultaneously the µ-and ν-problems. We explore extensions of the µνSSM adding a U (1) ′ gauge group, which provides the RH neutrinos with a non-vanishing charge. In these models, dubbed UµνSSM, the anomaly cancellation conditions impose the presence of exotic quarks in the spectrum that are vector-like under the standard model (SM) gauge group: either three pairs SU (2) quark singlets, or a pair of quark singlets together with a pair of quark doublets. Several extra singlets under the SM group can also be present, with the U (1) ′ charges making distinctions among them, and therefore allowing different types of couplings. Some of these singlets dynamically generate Majorana masses for the RH neutrinos, and others can be candidates for dark matter. The useful characteristics of models with U (1) ′ s are also present in UµνSSM models: baryon-number-violating operators as well as explicit Majorana masses and µ terms are forbidden, and the domain wall problem is avoided. The phenomenology of UµνSSM models is very rich. We analyze the experimental constraints on their parameter space, specially on the mass and mixing of the new Z ′ boson. In addition to the exotic quarks, which can hadronize inside the detector or decay producing SM particles, the UµνSSM models can also have new signals such as decays of the Z ′ to sparticle pairs like right sneutrinos, charginos or neutralinos. Besides, Z ′ and Higgs mediated annihilations and interactions with the visible sector of WIMP dark matter particles, can also be present.

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Multilepton dark matter signals

Cited by 8 publications

References 85 publications

WIMP Dark Matter in the U$μν$SSM

WIMP Dark Matter in the U$μν$SSM

$$U(1)'$$ extensions of the $$\mu \nu \mathrm{SSM}$$

$U(1)'$ extensions of the $μν$SSM

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