Search for RPV SUSY in the 4-lepton final state.

Abstract

We present a search for anomalous production of events with four isolated leptons in 19.5 fb-1 of data collected by the CMS experiment in pp collisions at √s = 8 TeV. No excess of events is observed over the standard model background. This allows us to exclude production cross sections for a set of Leptonic RPV SUSY models above 0.5-2 fb. We employ a new approach to interpretations, and demonstrate that the obtained results are valid for a wide range of SUSY models.

Detailed documentation can be found in SUS-13-010

Approved Tables and Plots from SUS-13-010

( click on plot to get .pdf )

Tables and Figures Abbreviated Caption
Table 1: Expected neutralino decay modes for non-zero λijk.
Figure 1a: Expected M1:M2 distribution for ZZ background. M1 is an invariant mass of the opposite-sign same-flavor lepton pair which mass is the closest to the Z mass of 91 GeV. M2 is an invariant mass of the remaining lepton pair
Figure 1b: Expected M1:M2 distribution for ttbarZ background. See Fig. 1a for M1 and M2 definitions
Figure 1c: Expected M1:M2 distribution for ttbarWW background. See Fig. 1a for M1 and M2 definitions
Figure 1d: Expected M1:M2 distribution for T2+LRPV model with msquark=425 GeV, mneutralino=225 GeV. See Fig. 1a for M1 and M2 definitions
Figure 2a: Invariant mass of OSSF tight leptons in events with MET < 30 GeV, with two tight leptons and one jet with pT > 30 GeV. Data are overlaid with MC predicted contributions from different sources.
Figure 2b: Invariant mass of the two OSSF tight leptons closest to 91 GeV in events with MET < 30 GeV, and with 3 isolated leptons. Data are overlaid with MC predicted contributions from different sources.
Figure 3: Contribution of events with 3 tight leptons and one jet into different M1:M2 regions. Data are overlaid with MC predicted contributions from different sources.
Table 2: Expected background contributions from different SM sources and experimentally observed events in all analysis regions.
Compact version of Table 2: Expected background contributions from different SM sources and experimentally observed events in all analysis region.
Figure 4a: LRPV extensions to Simplified Models, T2+LRPV model. The T2 RPC simplified model is squark pair production, with pp → squark squark → q χ0 q χ0, neutralinos decay to two charged leptons and a neutrino via an LRPV term, χ0→l+l- ν.
Figure 4b: LRPV extensions to Simplified Models, T1+LRPV model. The T1 RPC simplified model is gluino pair production, with pp → gluino gluino → q qbar χ0 q qbar χ0, neutralinos decay to two charged leptons and a neutrino via an LRPV term, χ0→l+l- ν.
Figure 5a: 4-lepton efficiency for the T2+LRPV model, χ0→e+e ν.
Figure 5b: 4-lepton efficiency for the T2+LRPV model, χ0→μ+μ ν.
Figure 6a: Projection of distributions of Figure 5 on the squark mass axis. For every neutralino mass the 4-lepton efficiency value is filled corresponding to the different squark masses. χ0→μ+μ ν.
Figure 6b: Projection of distributions of Figure 5 on the squark mass axis. For every neutralino mass the 4-lepton efficiency value is filled corresponding to the different squark masses. χ0→e+e ν.
Figure 6c: Projection of distributions of Figure 5 on the squark mass axis. 4-lepton efficiency profiles corresponding to distributions in Fig. 6 a and b. Tip, ideaROOT format
Figure 7a: 4-lepton efficiency for the T1+LRPV model, χ0→μ+μ ν. Full T1 parameter space.
Figure 7b: 4-lepton efficiency for the T1+LRPV model, χ0→μ+μ ν. Projection of the 4-lepton efficiency on the neutralino mass axis.
Figure 7c: Profile of the T1+LRPV 4-lepton efficiency distribution (blue) overlaid with corresponding distribution for the T2+LRPV model. Tip, ideaROOT format
Figure 8a: 4-lepton efficiency of this analysis for neutralinos decaying in rest (red points), overlaid with LRPV efficiency from Figure 6c. χ0→e+e ν. Tip, ideaROOT format
Figure 8b: 4-lepton efficiency of this analysis for neutralinos decaying in rest (red points), overlaid with LRPV efficiency from Figure 6c. χ0→μ+μ ν. Tip, ideaROOT format
Figure 9: Isolation efficiency for 4 leptons for the set of pMSSM models described in the text, as a function of the neutralino mass in the model. The green and yellow bands include 68% and 95% of the model points in the efficiency distribution respectively.
Figure 10a: 95% C.L. upper limit on the cross section of the T2+LRPV SUSY models. The band corresponds to the efficiency profiles in Figure 6c. Result for neutralino decaying exclusively to electrons or muons. Tip, ideaROOT format
Figure 10b: 95% C.L. upper limit on the cross section of the T2+LRPV SUSY models. The band corresponds to the efficiency profiles in Figure 6c. Result for the lepton flavors mixture corresponding to λ121≠0 and λ122≠0. Tip, ideaROOT format
Figure 11a: 95% C.L. upper limit on total cross section for generic SUSY models. The band corresponds to the efficiency uncertainty described in Sec. 7.2.4. Result for neutralinos decaying exclusively to electrons or muons. Tip, ideaROOT format
Figure 11b: 95% C.L. upper limit on total cross section for generic SUSY models. The band corresponds to the efficiency uncertainty described in Sec. 7.2.4. Result for the lepton flavors mixture corresponding to λ121≠0 and λ122≠0. Tip, ideaROOT format
Figure 12a: Mass exclusions for different production mechanisms for T1+LRPV/T2+LRPV models. A 30% theoretical uncertainty for NLO+NLL calculations of SUSY production cross sections is included in the uncertainty band. Tip, ideaROOT format
Figure 12b: Mass exclusions for different production mechanisms obtained using a generic inclusive RPV SUSY cross section limit in Figure 11. A 30% theoretical uncertainty for NLO+NLL calculations of SUSY production cross sections is included in the uncertainty band. Tip, ideaROOT format
Figure 13a: Comparison of ID efficiency as a function of 1/pT for leptons from neutralino decays in the T2+LRPV model, and for leptons from ZZ production. The considered leptons are all isolated on the generator level as described in the text. Tip, ideaROOT format
Figure 13b: Comparison of isolation efficiency as a function of 1/pT for leptons from neutralino decays in the T2+LRPV model, and for leptons from ZZ production. The considered leptons are all isolated on the generator level as described in the text. Tip, ideaROOT format
Figure 14a: Ratio of average reconstructed level isolation efficiency of all 4 charged leptons from two neutralino decays to the same average isolation efficiency, but calculated on the generator level for different pMSSM models.
Figure 14b: Ratio of reconstructed level to generator level efficiencies for different SUSY production mechanisms.
Figure 15a: Parametrization of the lepton efficiency by the cubic polynomial of 1/pT Tip, ideaROOT format
Figure 15b: Comparing FULL efficiency from Figure 6c with efficiencies calculated using the simplified generator level approach. Tip, ideaROOT format

-- FedorRatnikov - 07-May-2013

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