Supersymmetric scenarios with dominant radiative neutralino decay

Ambrosanio, S.; Mele, B.

doi:10.1103/physrevd.55.1399

Cited by 40 publications

(10 citation statements)

References 38 publications

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“…Searching for taus a signal of supersymmetry has recently been extensively studied, both in the context of supergravity-mediated models as well as gauge-mediated models [53,42,43,54,44,55,56,57,49,58,59]. In the absence of any signal at LEP, attention has been turned to the prospects at the upgraded Tevatron, in several high luminosity versions.…”

Section: Consequences Of a Neutralino Nlspmentioning

confidence: 99%

Phenomenology of flavor-mediated supersymmetry breaking

Kaplan¹,

Kribs²

2000

Phys. Rev. D

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The phenomenology of a new economical SUSY model that utilizes dynamical SUSY breaking and gauge-mediation (GM) for the generation of the sparticle spectrum and the hierarchy of fermion masses is discussed. Similarities between the communication of SUSY breaking through a messenger sector, and the generation of flavor using the Froggatt-Nielsen (FN) mechanism are exploited, leading to the identification of vector-like messenger fields with FN fields, and the messenger U(1) as a flavor symmetry. An immediate consequence is that the first and second generation scalars acquire flavor-dependent masses, but do not violate FCNC bounds since their mass scale, consistent with effective SUSY, is of order 10 TeV. We define and advocate a minimal flavor-mediated model (MFMM), recently introduced in the literature, that successfully accommodates the small flavor-breaking parameters of the standard model using order one couplings and ratios of flavon field vevs. The mediation of SUSY breaking occurs via two-loop log-enhanced GM contributions, as well as several one-loop and two-loop Yukawa-mediated contributions for which we provide analytical expressions. The MFMM is parameterized by a small set of masses and couplings, with values restricted by several model constraints and experimental data. The next-to-lightest sparticle (NLSP) always has a decay length that is larger than the scale of a detector, and is either the lightest stau or the lightest neutralino. Similar to ordinary GM models, the best collider search strategies are, respectively, inclusive production of at least one highly ionizing track, or events with many taus plus missing energy. In addition, D^0 - \bar{D}^0 mixing is also a generic low energy signal. Finally, the dynamical generation of the neutrino masses is briefly discussed.Comment: 54 pages, LaTeX, 8 figure

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Section: Consequences Of a Neutralino Nlspmentioning

confidence: 99%

Phenomenology of flavor-mediated supersymmetry breaking

Kaplan¹,

Kribs²

2000

Phys. Rev. D

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“…Notice that also in scenarios with µ < 0 the branching ratio for the radiative decay is less than 0.5% in the examined region of parameter space [21].…”

Section: A Scenariosmentioning

confidence: 83%

Spin correlations in the production and subsequent decay of neutralinos

Moortgat‐Pick

Fraas

1998

Phys. Rev. D

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We study the process e Ϫ e ϩ → 1 0 2 0 with the subsequent decay 2 0 → 1 0 l ϩ l Ϫ taking into account the complete spin correlations. We give the analytical formulas for the differential cross section and present numerical results for the lepton angular distribution and the distribution of the opening angle between the outgoing leptons for the CERN LEP2 energy of ͱsϭ193 GeV and for ͱsϭ500 GeV. We examine three representative mixing scenarios in the MSSM and also study the influence of the common scalar mass parameter m 0 on the shape of the distributions. For the lepton angular distribution, the effect of the spin correlations amounts to up to 20% for lower energies. We find that the opening angle distribution is suitable for distinguishing between Higgsino-like and gaugino-like neutralinos. The shape of the lepton angular distribution is very sensitive to the mixing in the gaugino sector and to the value of m 0 . For higher energies, it is also suitable for distinguishing between Higgsino-like and gaugino-like neutralino. ͓S0556-2821͑99͒02601-6͔

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“…For smaller mass differences, 130 MeV ∆m 1 2 GeV, the effective two-body processχ ± 1 → π ±χ0 1 [100][101][102] can dominate the hadronic branching fraction. Further, whenχ 0 2 is also almost degenerate withχ ± 1 , for an even smaller mass difference ∆m 2 ,χ 0 2 → γχ 0 1 can become significant [103][104][105][106]. Note that while the three-body decay modes (soft leptons/ jets andχ 0 1 ) suffer from phase space suppression ((∆m) 5 ), the two-body mode (γχ 0 1 ) is also suppressed by a loop factor.…”

Section: Compressed Higgsino Spectrum and Its Decay Propertiesmentioning

confidence: 97%

Natural SUSY at LHC with right-sneutrino LSP

Chatterjee

Dutta

Kumar

2018

J. High Energ. Phys.

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Abstract:We study an extension of the minimal supersymmetric standard model (MSSM) with additional right-handed singlet neutrino superfields. While such an extension incorporates a mechanism for the neutrino mass, it also opens up the possibility of having the right-sneutrinos ( ν) as the lightest supersymmetric particle (LSP). In this work, we focus on the viability of rather small ( 500 GeV) higgsino mass parameter (µ), an important ingredient for "naturalness", in the presence of such a LSP. For simplicity, we assume that the bino and wino mass parameters are much heavier; thus we only consider (almost) pure and compressed higgsino-like states, with small O(10 −2 ) gaugino admixture which nevertheless still affect the decay of the low-lying higgsino-like states, thus significantly affecting the proposed signatures at colliders. Considering only prompt decays of the higgino-like states, especially the lightest chargino, we discuss the importance of leptonic channels consisting of up to two leptons with large missing transverse energy to probe this scenario at the Large Hadron Collider (LHC). In addition we also comment on the dark matter predictions for the studied scenario.

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Supersymmetric scenarios with dominant radiative neutralino decay

Cited by 40 publications

References 38 publications

Phenomenology of flavor-mediated supersymmetry breaking

Phenomenology of flavor-mediated supersymmetry breaking

Spin correlations in the production and subsequent decay of neutralinos

Natural SUSY at LHC with right-sneutrino LSP

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