[Jef] The eta kin survey on 2016 spring Data 10491-10498

[zhangzy at jlab.org]

Hi, all,

We did the eta kin survey on 2016 spring Data 10491-10498.

The main conclusion is
1. The calibration continues to look quite good for the η photo
production.
2. The η mass is 2% low while the π0 mass was only 1% low for
FCAL**2.
3. The invariant mass resolution, in percent, is better for eta than pi0
(3.8% and 5.7% for FCAL**2).
4. It could be a nonlinearity in energy, or a small systematic problem
with the opening angle.
5. To understand the deviation on mass of η, a systematic study with
a kinematics fit may be needed for the η photo production.

More information is shown in the presentation in docDB:
http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=2991

Best wishes,
Jane