RPV simplified model grids

This page collects together information about various leptonic-RPV grids with χ₁⁰ LSP. They differ in the choice of NLSP and the RPV λ parameter (only the easiest - λ₁₂₁ and λ₁₂₂ - and hardest - λ₁₃₃ and λ₂₃₃ - have been requested).

In all grids, the LSP is forced to decay promptly (width = 100 MeV). The decays are chosen to be compatible with a single choice of RPV λ parameter, with equal branching fractions given to each mode. The decay options are controlled by the index choices on λ_ijk, where i and j must differ:

All the plots follow the same pattern, with dots showing the generated points. Acceptance refers to the 2011 5fb^-1 four-lepton SR1 (Z veto, MET>50 GeV). The event yield and expected significance follow on from the calculated acceptance. Just click on the figures to get an enlarged version.

Top left: Cross section in fb

Top right: Acceptance for 4 lepton + MET selection (a la 2011 analysis)

Bottom left: Event yield with 20 fb^-1

Bottom right: Significance (Z_N), with 5 ± 0.5 background

The grids

All are fully simulated, except for those which don't produce any final state taus: Sneut and Gluino grids with λ₁₂₁ and λ₁₂₂.

To find and download these grids, use the NLSP name from the table together with the λ parameter. For example:

dq2-ls mc12_8TeV.*_Wino_121.*.NTUP_SUSY.*/
dq2-ls mc12_8TeV.*_Wino_121.merge.AOD.*/

The points simulated and the statistics for each point have been optimised for each NLSP choice based on these principles:

1. The maximum NLSP mass has been chosen based on the expected sensitivity with 20 fb^-1 (to allow room for analysis/lumi improvements for Moriond).
   • For this, an event efficiency of 60% has been used and an estimated background on 5±2.5 events, both based on the 2011 analysis,
2. The grid point spacing is optimised to be sensitive to known significant features in the acceptance.
3. For the m_LSP = 10 GeV row, where acceptance is very low, the number of events per point is gauged based on a desired precision of 10% in Axε, with some points well outside our reach being omitted.
4. As the tau analysis has not yet been defined, the tau grids are just plain copies of the light lepton grids for the moment, with no allowance made for possible lower efficiencies.

Signal cross sections, calculated in the usual way are to be found here: /afs/cern.ch/atlas/groups/susy/SignalCrossSectionsUncert/RPVsimplifiedModels. Please read the README!

Wino/Bino grid

NLSP: Wino = χ₁^± and χ₂⁰ (equal mass)

Decay: χ₁^± -> LSP + W; χ₂⁰ -> LSP + Z

The W and Z may be virtual, depending on the sparticle mass difference.

λ₁₂₁

λ₁₂₂

SleptonL grid

NLSP: Left-handed sleptons (e,μ,τ, equal mass) Decay: slep -> lep + LSP

λ₁₂₁

λ₁₂₂

!SleptonR grid

NLSP: Right-handed sleptons (e,μ,τ, equal mass) Decay: slep -> lep + LSP

Note: Acceptance is identical to the SlepL case, the only difference is a much-reduced cross section

λ₁₂₁

λ₁₂₂

Sneutrino grid

NLSP: Sneutrinos (e,μ,τ, equal mass) Decay: snu -> nu + LSP

λ₁₂₁

λ₁₂₂

Gluino grid

NLSP: Gluinos Decay: gluino -> q + qbar + LSP (q=ucds)

λ₁₂₁

λ₁₂₂

-- MichaelFlowerdew - 18-Sept-2012