Abstract
Results are reported from a search for supersymmetry with gauge-mediated supersymmetry breaking in electroweak production. Final states with photons and large missing transverse energy (MET) were examined. The data sample was collected in pp collisions at sqrt(s) = 8 TeV with the CMS detector at the LHC and corresponds to 7.4 inverse femtobarns. The analysis focuses on scenarios in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape undetected. The data were obtained using a specially designed trigger with dedicated low thresholds, providing good sensitivity to signatures with photons, MET, and low hadronic energy. No excess of events over the standard model expectation is observed. The results are interpreted using the model of general gauge mediation. With the wino mass fixed at 10 GeV above that of the bino, wino masses below 710 GeV are excluded at 95% confidence level. Constraints are also set in the context of two simplified models, for which the analysis sets the lowest cross section limits on the electroweak production of supersymmetric particles.
Highlights
Within the solenoid volume are a silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter (HCAL), each composed of a barrel and two endcap sections
We have searched for electroweak production of gauginos in the framework of gauge mediated supersymmetry breaking in final states with photons and dataset, corresponding to an integrated luminosity of 7.4 fb−1, recorded with a special trigger with low thresholds is used
The analysis is sensitive to electroweak production and compressed mass spectra which are characterized by minimal hadronic activity in the final state, complementing previously published searches
Summary
Recently measured to be around 125 GeV [15,16], and the electroweak scale against large quantum corrections, providing a solution to the gauge hierarchy problem [17]. Other analyses requiring two photons in the final state [19,20,21] probe bino-like neutralinos and within the context of general gauge mediation (GGM) [35,36,37,38,39,40] exclude electroweakly produced winos with masses up to 740 GeV, depending on the bino mass. A previous singlephoton analysis [20] has set limits on bino- and wino-like neutralinos for strong production, but the search is insensitive to electroweak production because the chosen trigger requires HT > 500 GeV, where HT is the scalar sum of transverse energy clustered in jets. We consider three signal scenarios: The scenario TChiNg models the electroweak pair and associated production of nearly massdegenerate charginos and neutralinos, which decay into the NLSP, as shown in Fig. 1 (top row). The data set was recorded during the second half of the 2012 datataking period but only reconstructed during the Long Shutdown 1 of the LHC as part of the so-called “parked-data” program [41]
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