Search for a compressed supersymmetric spectrum with a light gravitino

Dutta, Juhi; Konar, Partha; Mondal, Subhadeep; Mukhopadhyaya, Biswarup; Kumar, Santosh

doi:10.1007/jhep09(2017)026

Cited by 15 publications

(14 citation statements)

References 65 publications

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“…In the MSSM context then, the only viable DM candidates are fermionic. A sneutrino LSP can manifest itself also through missing energy in collider experiments [27], however, the experimental analyses herein can provide only weak constraints on the gravitino mass m 3/2 (i.e., m 3/2 10 −13 GeV) [28]. In contrast, DM observations provide significant constraints on the gravitino LSP.…”

Section: Introductionmentioning

confidence: 68%

Sneutrino Dark Matter in the BLSSM

Rose

Khalil

King

et al. 2018

J. High Energ. Phys.

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In the framework of the (B − L) Supersymmetric Standard Model (BLSSM), we assess the ability of ground and space based experiments to establish the nature of its prevalent Dark Matter (DM) candidate, the sneutrino, which could either be CP-even or -odd. Firstly, by benchmarking this theory construct against the results obtained by the Planck spacecraft, we extract the portions of the BLSSM parameter space compliant with relic density data. Secondly, we show that, based on current sensitivities of the Fermi Large Area Telescope (FermiLAT) and their future projections, the study of highenergy γ-ray spectra will eventually enable us to extract evidence of this DM candidate through its annihilations into W + W − pairs (in turn emitting photons), in the form of both an integrated flux and a differential energy spectrum which cannot be reconciled with the assumption of DM being fermionic (like, e.g., a neutralino), although it should not be possible to distinguish between the scalar and pseudoscalar hypotheses. Thirdly, we show that, while underground direct detection experiments will have little scope in testing sneutrino DM, the Large Hadron Collider (LHC) may be able to do so in a variety of multilepton signatures, with and without accompanying jets (plus missing transverse energy), following data collection during Run 2 and 3.

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Section: Introductionmentioning

confidence: 68%

Sneutrino Dark Matter in the BLSSM

Rose

Khalil

King

et al. 2018

J. High Energ. Phys.

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“…It is in this spirit that alternative candidates in small extensions of the minimal supersymmetric standard model (MSSM) have been explored. One example consists in scenarios with gravitino as warm DM [1][2][3][4][5][6][7][8][9]. Another, quite minimalistic, extension is to extend the MSSM with a right-chiral neutrino superfield for each family, and postulate that one right-sneutrino-dominated scalar is the DM candidate.…”

Section: Introductionmentioning

confidence: 99%

Right sneutrino with ΔL=2 masses as nonthermal dark matter

2019

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We consider MSSM with right-chiral neutrino superfields with Majorana masses, where the lightest right-handed sneutrino dominated scalars constitutes non-thermal dark matter (DM). The ∆ L = 2 masses are subject to severe constraints coming from freeze-in relic density of such DM candidates as well as from sterile neutrino freeze-in. In addition, big-bang Nucleosynthesis and freeze-out of the next-to-lightest superparticle shrink the viable parameter space of such a scenario. We examine various ∆ L = 2 mass terms for families other than that corresponding to the LSP sneutrino. ∆ L = 2 masses are difficult to reconcile with a right-sneutrino DM, unless there is either (a) a hierarchy of about 3 orders of magnitudes among various supersymmetry-breaking mass parameters, or, (b) strong cancellation between the higgsino mass and the trilinear supersymmetry breaking mass parameter for sneutrinos.

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“…While within the paradigm of the MSSM, the lightest neutralino is the LSP, and most supersymmetric searches are based on the same assumption. There have been studies with gravitino LSP, discussing implications on cosmology and signatures at the LHC [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. In other simple extensions, axion and/or axino as the LSP [54][55][56][57][58] and right-sneutrino LSP have also been considered in minimal extensions of the MSSM [59][60][61][62][63][64][65][66][67][68][69][70].…”

Section: Introductionmentioning

confidence: 99%

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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Search for a compressed supersymmetric spectrum with a light gravitino

Cited by 15 publications

References 65 publications

Sneutrino Dark Matter in the BLSSM

Sneutrino Dark Matter in the BLSSM

Right sneutrino with ΔL=2 masses as nonthermal dark matter

Natural SUSY at LHC with right-sneutrino LSP

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