Background

The GEANT4 simulation was run throwing DIS electrons and pi0s (electro and photoproduction) from all target materials. With typical electron cuts the following graphs are produced:

1. Detection efficiency vs bigcal angles
2. Events vs reconsturcted angles
3. Energy distribution of events. (black: All, green: std cuts, red: pi0 events, blue: DIS events)
4. Ratio of pi0 to DIS events (red over blue from previous plot). Also shown is a model from Fersch's thesis (CLAS).
5. Theta distribution of events (red: pi0 events, blue: DIS events)
6. Theta ratio
7. Phi distribution of events (red: pi0 events, blue: DIS events)
8. Phi ratio

What does this tell us?
The simulation agrees well with a previous experiment and can be trusted.

What about the data?
Since I know exactly the cross sections thrown, the "simulated charge" (or if beam current is assumed, "simulated time") can be calculated from the number of events. Therefore we can compare the normalized rates of data to MC.

The plot above is from the MC results. The plots are:
Black: The normalized rate for "electrons" passing the electron cuts.
Red: The normalized rate for 2 cluster - no cherenkov events (possibly pi0s).

1. Vs Energy
2. Vs Theta
3. Vs Phi

Ignoring the first row, the plots below are from data

The distributions of events looks pretty reasonable. The trigger inefficiency is expected and at higher energy the agreement becomes better.

	Name	Last modified	Size	Description
	Parent Directory		-
	f_pairs_para59_rates..>	2015-01-09 17:56	8.1K
	f_pairs_para59_data_..>	2015-01-09 17:56	22K
	f_pairs_para59_20.png	2015-01-09 17:56	32K
	thrown_particle_dist..>	2015-01-09 17:56	32K
	f_pairs_para59_19.png	2015-01-09 17:56	34K
	f_pairs_para59_20.pdf	2015-01-09 17:56	44K