Searching for supersymmetry in<i>Z’</i>decays

Corcella, Gennaro

doi:10.1051/epjconf/20136018011

Cited by 8 publications

(16 citation statements)

References 9 publications

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“…[8,9,12] yielded substantial decay rates into supersymmetric particles and was consistent with the present exclusion limits, but did not take into account for the recent discovery of a Higgs-like boson. In this paper, I shall extend the work in [8,9] giving some useful benchmarks for possible Z searches within supersymmetry.…”

Section: Introductionsupporting

confidence: 67%

“…Although SM decays are still dominant and the most promising for the searches, the opening of new channels decreases the branching ratios into electron and muon pairs and therefore the mass exclusion limits. Reference [12], using a representative point of the MSSM parameter space as in [8,9], found that the LHC exclusion limits decrease by an amount m Z 150-300 GeV, once accounting for BSM decay modes at √ s = 8 TeV. From the viewpoint of supersymmetry, the lack of evidence of new particles in the LHC runs at 7 and 8 TeV, together with the discovery of a boson with mass m h = 125.7± 0.4 GeV [13] and properties consistent with the Standard Model Higgs boson [14,15], sets some tight constraints on the mass spectra and couplings of possible supersymmetric models.…”

Section: Introductionmentioning

confidence: 99%

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Phenomenology of supersymmetric Z $$'$$ ′ decays at the Large Hadron Collider

Corcella

2015

Eur. Phys. J. C

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I study the phenomenology of heavy neutral bosons Z , predicted in GUT-inspired U(1) models, at the Large Hadron Collider. In particular, I investigate possible signatures due to Z decays into supersymmetric particles, such as chargino, neutralino, and sneutrino pairs, leading to final states with charged leptons and missing energy. The analysis is carried out at √ s = 14 TeV, for a few representative points of the parameter space of the Minimal Supersymmetric Standard Model, suitably modified to accommodate the extra Z boson and consistent with the discovery of a Higgs-like boson with mass around 125 GeV. Results are presented for several observables and compared with those obtained for direct Z decays into lepton pairs, as well as direct production of supersymmetric particles. For the sake of comparison, Z phenomenology in an effective supersymmetric extension of the Sequential Standard Model is also discussed.

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Section: Introductionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Phenomenology of supersymmetric Z $$'$$ ′ decays at the Large Hadron Collider

Corcella

2015

Eur. Phys. J. C

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“…(3.1) are allowed to vary in the ranges given in Table II, the lower bound on the mass of the Z boson being the minimum value allowed for any choice of the U (1) symmetry (and corresponds to the U (1) η case). This mass has been taken smaller than the one quoted in the 2016 Particle Data Group review [59] in order to allow for significant branching fractions for the Z boson decays into a pair of supersymmetric particles [64]. We have retained scenarios for which the predictions for the observables listed in Table III agree the Higgs sector, namely a theory-experiment agreement for the Higgs boson mass, the gluon and vector boson fusion Higgs boson production cross-sections, and the Higgs signal strengths, have been applied by using HiggsBounds and HiggsSignals.…”

Section: Technical Setupmentioning

confidence: 99%

DifferentiatingU(1)′supersymmetric models with right sneutrino and neutralino dark matter

2017

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We perform a detailed analysis of dark matter signals of supersymmetric models containing an extra U (1) gauge group. We investigate scenarios in which either the right sneutrino or the lightest neutralino are phenomenologically acceptable dark matter candidates and we explore the parameter spaces of different supersymmetric realisations featuring an extra U (1) . We impose consistency with low energy observables, with known mass limits for the superpartners and Z bosons, as well as with Higgs boson signal strengths, and we moreover verify that predictions for the anomalous magnetic moment of the muon agree with the experimental value and require that the dark matter candidate satisfies the observed relic density and direct and indirect dark matter detection constraints. For the case where the sneutrino is the dark matter candidate, we find distinguishing characteristics among different U (1) mixing angles. If the neutralino is the lightest supersymmetric particle, its mass is heavier than that of the light sneutrino in scenarios where the latter is a dark matter candidate, the parameter space is less restricted and differentiation between models is more difficult. We finally comment on the possible collider tests of these models.

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“…U(1) ′ gauge groups and Z ′ bosons arise in the framework of a rank-6 Grand Unification group E 6 . The Z ′ ψ is associated with U(1) ′ ψ , coming from the breaking of E 6 into SO(10):…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Supersymmetric Z' decays at the LHC

Corcella¹

2016

Proceedings of 18th International Conference From the Planck Scale to the Electroweak Scale — PoS(PLANCK 2015)

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Searching for Z ′ bosons, predicted in GUT-inspired U(1) ′ gauge models and in the Sequential Standard Model, is one of the main challenges of the experiments carried out at the Large Hadron Collider. Such searches have so far focused on high-mass dilepton pairs, assuming that the Z ′ has only Standard Model decay modes, and have set mass exclusion limits around 2.5-3 TeV. In this talk, I investigate supersymmetric Z ′ decays at 14 TeV LHC, extending the MSSM in such a way to accommodate extra heavy gauge bosons. In particular, I study Z ′ decays into pairs of sleptons, charginos and neutralinos, leading to final states with leptons and missing energy, and present results for few reference points of the parameter space, consistent with a SM-like Higgs boson with a mass around 125 GeV. I also discuss the feasibility to search for Dark Matter candidates, by analysing Z ′ decays into the lightest MSSM neutralinos.

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Searching for supersymmetry inZ’decays

Cited by 8 publications

References 9 publications

Phenomenology of supersymmetric Z $$'$$ ′ decays at the Large Hadron Collider

Phenomenology of supersymmetric Z $$'$$ ′ decays at the Large Hadron Collider

DifferentiatingU(1)′supersymmetric models with right sneutrino and neutralino dark matter

Supersymmetric Z' decays at the LHC

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