Abstract
Searches for supersymmetry (SUSY) are presented based on the electroweak pair production of neutralinos and charginos, leading to decay channels with Higgs, Z, and W bosons and undetected lightest SUSY particles (LSPs). The data sample corresponds to an integrated luminosity of about 19.5 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 8 TeV collected in 2012 with the CMS detector at the LHC. The main emphasis is neutralino pair production in which each neutralino decays either to a Higgs boson (h) and an LSP or to a Z boson and an LSP, leading to hh, hZ, and ZZ states with missing transverse energy (ET(miss)). A second aspect is chargino-neutralino pair production, leading to hW states with ET(miss). The decays of a Higgs boson to a bottom-quark pair, to a photon pair, and to final states with leptons are considered in conjunction with hadronic and leptonic decay modes of the Z and W bosons. No evidence is found for supersymmetric particles, and 95% confidence level upper limits are evaluated for the respective pair production cross sections and for neutralino and chargino mass values.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6,7,8], one of the most widely considered extensions of the standard model (SM) of particle physics, stabilizes the Higgs boson mass at the electroweak energy scale, may predict unification of the strong, weak, and electromagnetic forces, and might provide a dark matter candidate
Supersymmetry postulates that each SM particle is paired with a SUSY partner from which it differs in spin by one-half unit, with otherwise identical quantum numbers
Each member of the pair initiates a decay chain that terminates with a stable lightest SUSY particle (LSP) and SM particles
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6,7,8], one of the most widely considered extensions of the standard model (SM) of particle physics, stabilizes the Higgs boson mass at the electroweak energy scale, may predict unification of the strong, weak, and electromagnetic forces, and might provide a dark matter candidate. Searches are presented for electroweak pair production of neutralinos and charginos that decay to the hh, hZ, and hW states. We consider the R-parity-conserving chargino-neutralino χ~Æ1 χ~02 electroweak pair production process shown in. 0 1 neutralino is a massive, stable, weakly interacting binolike LSP, where a bino is the SUSY partner of the B gauge boson This scenario represents the SUSY process with the largest electroweak cross section [38].
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