Energy Resolution

By selecting only the symmetric pi0 decays within 5 percent of the correct angle for E1=1100+-25 MeV, the second photon energy is plotted. It should be centered at 1100.

• black - both clusters in RCS
• red - both clusters in RCS
• green - First cluster in Protvino, second cluster in RCS
• blue - First cluster in RCS, second cluster in Protvino

The lower energy events seemed to be doing better. Here is 900 MeV (ignore the colors):

Next I do a little bit more calibration of just the central region of bigcal. This time I only use high energy clusters E>900 MeV (instead of 400 MeV).

Then selecting only the "cross cut" clusters.

Conclusion

I guess it is not unexpected but there is a refinement in the clustering that happens when the data is replayed with a new calibration. So I am trying to improve the calibration by doing (calibration, replay, calibration, replay, etc...). This should converge.
There still seems to be room for improvement in the calibration at high energies.

d2

The inelastic CN moment

The total Nachtmann moment

The statistical error bars are not right yet. I am still trying to figure out the best way to go about fixing them.

	Name	Last modified	Size	Description
	Parent Directory		-
	x2g1_combined2_2408.png	2015-03-05 13:56	40K
	x2g2_combined2_2408.png	2015-03-05 13:56	39K
	plot_Ediff.png	2015-02-13 00:27	27K
	plot_d2p_2_2407.png	2015-03-04 22:32	22K
	plot_d2p_nachtmann_7..>	2015-03-04 22:27	20K
	energy_resolution-90..>	2015-02-28 00:10	16K
	energy_resolution-11..>	2015-03-05 00:11	13K
	energy_resolution-11..>	2015-03-05 00:17	13K
	energy_resolution-11..>	2015-03-01 23:01	12K