I have implemented a cut set based on this one except with the additional requirements that the event contains a soft electron and that the charge correlation for clusters containing an electron be negative. The requirements are as follows:
- met>20 GeV
- ht>100 GeV
- at least 1 soft electron
- at least 1 track/pi0 cluster with pT>10 GeV and N(live)<7.
- if the soft electron is inside a cluster, qCorr<0.
The expected signal and background for these cuts are
| N(signal) | N(W+jets) | N(ttbar) | N(t-channel single top) | Significance |
|---|---|---|---|---|
| 9 | 2406 | 421 | 47 | 0.17 |
I have also made tables of N(live), N(tracks), N(pi0s) for the following cases:
- Event contains a soft electron but it is not inside the cluster. Table is here.
- Event contains a soft electron and it is inside the cluster; no cut on the charge correlation. Table is here.
- Event contains a soft electron and it is inside the cluster and qCorr<0. Table is here.
The 5 most significant N(live), N(tracks), N(pi0s) bins for the 3 cases are listed below.
Soft Electron Outside Cluster
| N(live) | N(tracks) | N(pi0s) | N(signal) | N(bg) | Significance |
|---|---|---|---|---|---|
| 2 | 2 | 0 | 0.65 | 230 | 0.043 |
| 3 | 2 | 2 | 0.30 | 66 | 0.037 |
| 2 | 3 | 0 | 0.37 | 105 | 0.036 |
| 1 | 1 | 3 | 0.03 | 0.66 | 0.035 |
| 2 | 2 | 1 | 0.38 | 121 | 0.034 |
Soft Electron Inside Cluster; no cut on qCorr
| N(live) | N(tracks) | N(pi0s) | N(signal) | N(bg) | Significance |
|---|---|---|---|---|---|
| 2 | 2 | 0 | 1.12 | 66 | 0.14 |
| 2 | 2 | 1 | 1.12 | 126 | 0.10 |
| 1 | 1 | 1 | 0.77 | 66 | 0.09 |
| 3 | 2 | 2 | 0.40 | 47 | 0.059 |
| 3 | 2 | 3 | 0.24 | 22 | 0.051 |
Soft Electron Inside Cluster; qCorr<0
| N(live) | N(tracks) | N(pi0s) | N(signal) | N(bg) | Significance |
|---|---|---|---|---|---|
| 2 | 2 | 0 | 1.02 | 47 | 0.15 |
| 2 | 2 | 1 | 0.92 | 71 | 0.11 |
| 3 | 2 | 3 | 0.23 | 12 | 0.065 |
| 2 | 2 | 2 | 0.34 | 29 | 0.063 |
| 3 | 2 | 2 | 0.36 | 33 | 0.062 |
Notice that in all of the cases, the most significant bins are with N(live)<4. Also notice that the cut on charge correlation cuts 29% and 44% of the background in the (2,2,0) and (2,2,1) bins, respectively, while barely taking any signal away at all. This is intuitive in the 2 track bin, since one of the tracks must be the soft electron and therefore the other one is a 1-prong tau decay. Since the taus are coming from a neutral a0, the 2 track bin is the most pure for this cut. --Dan