This shows the set of vertex2 lambdas which were chosen in the approximately exponential region of the vtx2 lambda region. The overall weighted efficiency using this method is approx. Part 3 - Efficiency based upon Gaussian fit of signal 3a. Spreadsheet to calculate efficiency of gaussian fit vee lambdas Using the fit values, the ds package found 3200 events and the vtx2 package 318 events. Cases 4,5,6 all have some form of momentum recovery, so are smeared some.
Bottom right shows the sum of all cases.
Note that each case covers a specific region of decay.