A light sneutrino rescues the light stop

Chala, M.; Delgado, A.; Nardini, Germano; Quirós, M. (2017). A light sneutrino rescues the light stop. Journal of High Energy Physics, 2017(4), 097. Springer 10.1007/JHEP04(2017)097

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Stop searches in supersymmetric frameworks with R-parity conservation usu- ally assume the lightest neutralino to be the lightest supersymmetric particle. In this paper we consider an alternative scenario in which the left-handed tau sneutrino is lighter than neutralinos and stable at collider scales, but possibly unstable at cosmological scales. Moreover the (mostly right-handed) stop t is lighter than all electroweakinos, and heavier than the scalars of the third generation lepton doublet, whose charged component, τ , is heavier than the neutral one, ν . The remaining supersymmetric particles are decoupled from the stop phenomenology. In most of the parameter space, the relevant stop decays are only into tτ τ, tν ν and bν τ via off-shell electroweakinos. We constrain the branching ratios of these decays by recasting the most sensitive stop searches. Due to the “double invisible” kinematics of the t → tν ν process, and the low efficiency in tagging the tτ τ decay products, light stops are generically allowed. In the minimal supersymmetric standard model with ∼ 100 GeV sneutrinos, stops with masses as small as ∼ 350 GeV turn out to be allowed at 95% CL.

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