content_image/356002.jpg
Fig. 3 shows the transverse momentum distributions of the reconstructed leptons and the two leading jets, for a signal sample with m$_{χ}$ = 500 GeV. 

<img src='content_image/356002.jpg'>

Taking these distributions into consideration, we applied the following selection cuts: 

1. Exactly three isolated leptons, not all same-sign, with p$_{T}$ > 25 GeV, of which at least two have p$_{T}$ > 80 GeV; 

2. At least two jets with p$_{T}$ > 25 GeV or one jet with p$_{T}$ > 50 GeV; 

3. The Z -veto is applied by requiring that | m$_{ℓ}$ $^{+}$ℓ − − m$_{Z}$ | > 25 GeV. 

Isolation cuts for electrons were applied by the default PGS reconstruction algorithm. The isolation cuts for muons are defined as follows: 

1. The summed transverse momentum in Δ R = 0 . 4 cone around the muon (excluding the muon itself) is < 5 GeV; 

2. The ratio of transverse energy in a grid of 3 × 3 calorimeter cells around the muon (including the muons cell) to the transverse momentum of the muon is < 0 . 1. 

Table II presents the numbers of events passing the selection criteria (in fb). The signal corresponds to model LL, where there are three quasi-degenerate heavy leptons. 

