content_image/354683.jpg content_image/354690.jpg content_image/354689.jpg
with a heavy neutral lepton pair and the same final state (3.2). 

<img src='content_image/354683.jpg'>

The transverse mass of the heavy neutral lepton was calculated according to 

where p χ 0 T = p ℓ + T + p ℓ − T , with ℓ + and ℓ − the two leptons associated with the χ 0 → W $^{+}$ℓ − → νℓ $^{+}$ℓ − decay, and E χ 0 T = √ m 2 ℓ $^{+}$ℓ − + | p χ 0 T | $^{2}$. The invariant mass of the heavy charged lepton was reconstructed from the momenta of 

the two highest p$_{T}$ jets in the event and the lepton that has opposite charge to that of the W : 

<img src='content_image/354690.jpg'>

<img src='content_image/354689.jpg'>

If the Z/h is highly boosted, it can be reconstructed as a single jet. Therefore in the case that there is only a single reconstructed jet in the event with p$_{T}$ > 50 GeV, p$_{j}$$_{2}$ is omitted from (3.5). The distributions of the reconstructed m$_{χ}$ ± and m χ 0 T are shown in Fig. 5, for m$_{χ}$ = 700 GeV. 

