Attendees: Ashot, Chao G., Chao P., Dipangkar, Haiyan, Maxime, Mahbub, Nilanga, Weizhi, Xuefei.


Weizhi: 
Showed a plot of (ep/ee)sim/(ep/ee)data vs theta and Q^2 for 1 and 2 GeV together. in the PWO region they are consistent but there is a large slope in the LG region starting at the transition.

Weizhi will look at the digitization issue and also the new Moller radiative correction code from the Olympus experiment.

Form factor from 1 and 2 GeV are also consistent.

The superratio vs different form factors shows a systematic difference correlated with the proton radius used in the form factor. The difference is  about 2.5% at the largest angle and about 0.5% at the smallest angle.
There is also a clear distinction between the crystal and LG region.

Checked with and without GEM there is not much difference at large angles, at
small angles there is fluctuation due to lack of density corrections. Density correction is being added. 

Need to be carefully about cosmics contribution when doing these comparisons.

superratio of live charge vs superratio of live time  is consistent to the level of 1+/- 0.1% showing that the cosmics are being rejected correctly.

superratio as function of E cut (4 sigma to 2 sigma) shows the same slope (angular dependence)  so the energy cut is not an issue.

Used simulation to study if deadtime can cause an angular dependence.
To first order the deadtime effect cancels in the ratio, but we are measuring 
absolute rates so this needs to be looked at carefully. 
<TASK> look at two periods with different dead time
<TASK> add jitter to the deadtime simulation 
<TASK> reexamine trigger efficiency 

 
 
Xuefei:
Added continued fraction method to code package and performed the full suite of tests. CF 2nd order seems to do best independent of input model.

Showed that adding fluctuation to data will not help get the correct central value. 

Need to let GE value fluctuate by creating multiple GE tables. 

<TASK> Write a tech-note on this work that could potentially be published.