Abstract
Abstract Current experimental constraints on a large parameter space in supersymmetric models rely on the large missing energy signature. This is usually provided by the lightest neutralino which stability is ensured by R-parity. However, if R-parity is violated, the lightest neutralino decays into the standard model particles and the missing energy cut is not efficient anymore. In particular, the U DD type R-parity violation induces the neutralino decay to three quarks which potentially leads to the most difficult signal to be searched at hadron colliders. In this paper, we study the constraints on R-parity violating supersymmetric models using a same-sign dilepton and a multijet signatures. We show that the gluino and squarks lighter than TeV are already excluded in the constrained minimal supersymmetric standard model with the R-parity violation if their masses are approximately equal. We also analyze constraints in a simplified model with the R-parity violation. We compare how the R-parity violation changes some of the observables typically used to distinguish a supersymmetric signal from standard model backgrounds.
Highlights
JHEP01(2013)128 relation in gaugino masses and non-decoupling first and second generation squarks)
We show that the gluino and squarks lighter than TeV are already excluded in the constrained minimal supersymmetric standard model with the R-parity violation if their masses are approximately equal
We have investigated constraints on SUSY models with R-parity violation from ATLAS and CMS experiments
Summary
Where Ui, Dj are generation i, j right-handed quark superfields. In the analyzed models the lightest supersymmetric particle will be the lightest neutralino. The ATLAS search still has a sufficient sensitivity to the R-parity violating signal where missing energy can originate from decays of weak bosons appearing in the SUSY cascade chain, W → lν, Z → νν. The weak bosons in cascade decay chains play a key role in constraining the R-parity violating SUSY models using the current LHC analyses. If MW > mq > MB, squarks mainly decay into the lightest neutralino with one jet Even in this case, stops (produced either directly or in gluino decay chains) could be a source of W bosons originating from top quark decays. If sleptons are light and SUSY particles decay into LSP with intermediate sleptons, many leptons would be expected in the final state This would result in a high sensitivity in other search channels, see e.g. This would result in a high sensitivity in other search channels, see e.g. [7, 25, 26]
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