qsq = 2 * Ebeam * Eprime * (1 - cos(theta_scatter))
I made a cut on only 1 track events. I also investigated using cuts on target theta and phi to get a cleaner distribution, but these additional cuts had little impact.
I will post results soon from more recent sampling DAQ runs.
Note that the average Q2 of 0.69 is considerably higher (some 10% higher) than the anticipated 0.62 GeV?