Abstract
Search for compressed supersymmetry at multi-TeV scale, in the presence of a light gravitino dark matter, can get sizable uplift while looking into the associated fat- jets with missing transverse momenta as a signature of the boson produced in the decay process of much heavier next-to-lightest sparticle. We focus on the hadronic decay of the ensuing Higgs and/or Z boson giving rise to at least two fat-jets and in the final state. We perform a detailed background study adopting a multivariate analysis using a boosted decision tree to provide a robust investigation to explore the discovery potential for such signal at 14 TeV LHC considering different benchmark points satisfying all the theoretical and experimental constraints. This channel provides the best discovery prospects with most of the benchmarks discoverable within an integrated luminosity of mathrm{mathcal{L}} = 200 fb−1. Kinematic observables are investigated in order to distinguish between compressed and uncompressed spectra having similar event yields.
Highlights
Background processZ + jets [N2LO] W + jets [NLO]Single-top [N2LO] Diboson (ZZ, W W, ZW ) + jets [NLO] tt + jets [N3LO]cross section 6.33 × [52, 53]1.95 × [54] 83.1, 12.35, 248.0 [55] 17.72, 124.31, 51.82 [56] 988.57 [57] W → lν +jets contributes to the SM background processes when the lepton is misidentified
Search for compressed supersymmetry at multi-TeV scale, in the presence of a light gravitino dark matter, can get sizable uplift while looking into the associated fatjets with missing transverse momenta as a signature of the boson produced in the decay process of much heavier next-to-lightest sparticle
We consider a compressed SUSY scenario, where both coloured and electro-weak new physics sectors are sitting at multi-TeV scale in the presence of a light gravitino as dark matter candidate
Summary
Our focus is on a compressed MSSM sector with the higgsino-like χ01 as the NLSP along with a light G LSP. The branching ratios of the χ01 decay are governed by its composition and on the value of the parameters M1, M2, μ and tan β [15, 19, 27,28,29]. Note that for the higgsino-like case there is a huge suppression in branching probability to γ G mode, Γ(χ01 → γG) ∝ |N11 cos θW + N12 sin θW |2 (MP lmG)−2, since the photon mode is governed by the bino and wino components which are suppressed as compared to the higgsino fraction. For negative (μ/M1), the h G decay is greater than Z G decay, primarily in the low tan β regime This motivates choice of regions in the parameter space where either decay mode or both have branching fractions which are substantial in order to explore the multifarious signal possibilites. We choose the representative benchmarks after briefly summarising the relevant experimental constraints
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