Abstract
The results of a search for new physics in final states with jets, either photons or leptons, and low missing transverse momentum are reported. The study is based on a sample of proton–proton collisions collected at a center-of-mass energy s=8 TeV with the CMS detector in 2012. The integrated luminosity of the sample is 19.7 fb−1. Many models of new physics predict the production of events with jets, electroweak gauge bosons, and little or no missing transverse momentum. Examples include stealth models of supersymmetry (SUSY), which predict a hidden sector at the electroweak energy scale in which SUSY is approximately conserved. The data are used to search for stealth SUSY signatures in final states with either two photons or an oppositely charged electron and muon. No excess is observed with respect to the standard model expectation, and the results are used to set limits on squark pair production in the stealth SUSY framework.
Highlights
Models of supersymmetry [1,2] (SUSY) with a stable, neutral, massive, weakly interacting, lightest supersymmetric particle (LSP)have received considerable attention in recent years because they simultaneously offer a solution to the hierarchy problem, allow unification of the fundamental interactions, and provide a dark matter candidate
In this Letter we present a search for stealth SUSY signatures involving the decay of a gaugino to a stealth-model particle and either a photon (γ analysis) or a leptonically decaying W± boson
For the γ analysis we require the presence of two photons in the final state, while for the ± analysis we require the presence of two leptons with different flavors and opposite charges (e±μ∓)
Summary
Models of supersymmetry [1,2] (SUSY) with a stable, neutral, massive, weakly interacting, lightest supersymmetric particle (LSP). Because it is weakly connected to the SUSY-breaking sector, the hidden sector is populated with nearly mass-degenerate superpartners With this addition, the LSP of non-stealth scenarios, taken to be a gaugino (i.e., a neutralino or chargino), assumes the role of the lightest “visible sector” SUSY particle (LVSP) and can decay without violating R-parity [24] to yield a lighter hidden-sector. For the γ analysis we require the presence of two photons in the final state, while for the ± analysis we require the presence of two leptons with different flavors and opposite charges (e±μ∓) Both the γ and ± analyses are based on a search for an excess of events with a large number of jets Njets and high ST, where ST is the scalar sum of the transverse momenta pT of all physics objects used in the study.
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