Analysis

Particle Identification

Electron

Cuts

Calorimeter based cuts

The distributions below represent two types of cuts applied to improve the electron particle identification (PID) using a 4 GeV electron beam incident on an NH3 target. The electron calorimeter is segmented into an inner$EC_{inner}$ and an outer$EC_{outer}$ region. The total energy absorbed by the calorimeter system is recorded in the variable $EC_{tot}$. The momentum ($P$) is calculated using the reconstructed track and the known torus magnetic field. The distributions of $EC_{tot}$ and $EC_{inner}$ are shown below where both have been divided by the electron momentum and no cuts have been applied.

$EC_{tot}\gt 0.2*p$

Without any cuts we have 181018 entries. After using the following cut $EC_{tot}\gt 0.2*p$ we are getting 127719 entries, which is about 70.55% of 181018.

200 px

$EC_{inner}\gt 0.08*p$

After the cut on the energy deposited into inner part of electron calorimeter, number of entries decreases by 22%.

Both cuts are applied

In case of using the cuts of the total deposited energy and the energy deposited into inner calorimeter number of entries decreases ~36%