Here I take another look at the RT cut I use in my analysis ...

At the jet meeting on 5/6/14, some questions were raised about the implementation of my RT cut. Currently I cut events in which both jets in the dijet have neutral fractions of 1. There was a question and some concern about exactly how that cut was implemented in my code, the exact condition was:

if(jet1->rt() == 1 && jet2->rt() == 1) continue

It was suggested that instead of making a cut on neutral fraction, I require that at least one jet had at least one track, so the condition was:

if(jet1->numTracks() == 0 && jet2->numTracks() == 0) continue

As would be expected, these two conditions are equivalent.

Figure 1: Comparison of the original neutral fraction cut used in my analysis (Blue) and the number of tracks cut suggested during the jet meeting (Red). The dijet mass of the events failing the cuts is shown. The spectra are equivalent.

I also compared the rt cuts above with two other cuts: eliminating events in which one jet had a neutral fraction above 0.95, and eliminating events in which both jets had a neutral fraction above 0.95.

Figure 2: The RT spectra of events which did not pass the various cuts (the black curve shows the RT spectrum of all events with no RT cut for reference). The Red curve shows the events which failed the one jet RT>0.95 cut. The Blue curve shows the events which failed the both jet RT>0.95 cut. The Green curve shows the events which fail my both jets RT=1 cut.

Figure 3: Same as figure 2, but now showing the invariant mass spectra of the events failing the various cuts (with the full mass spectrum as reference).