March 31 2011 Meeting Summary

Back to CSR Weekly Meeting on 2011

1. xinhu: [Detector and cross sections check ]
2. hyao: [RHRS 15 Cross Section and LHRS First acceptance and cross section]

xinhu:

1. NaI Box 2 looks ok. Box 3 block 22( in the middle of box 3, for lower energy ), so cut it. But it's not for all runs(xinhu will upload the figure with good 22 block).
2. with Q3 cut, target and fp comparison becomes better. XS at central dp is good, at edge is bad with small Q3 cut. (-0.03<dp<0.03, bin size=0.01)
3. Since have 6 bins, the cross section at large omega(small Ep, dp) is higher, meaning acceptance is small. Because there is overlap for the adjacent runs, we can correct the acceptance at this small dp.
4. For right arm, |theta|<0.04 |phi|<0.014 |dp|<0.03, for |dp-0.02|<0.01, the acceptance needs to be corrected with overlap omega region.

hyao:

1. Same problem with xinhu. Acceptance at dp edge is not good, but we have overlap region which can be used to correct acceptance.
2. 15 deg high momentum is almost finished except some points to be checked.
3. Left arm cross section first try is not good because of NaI calibration.

To do list:

xinhu:

1. make no cut for box2,box3. If block is bad in box2, use adjacent blocks to correct it.
2. correct acceptance at edge dp for right arm high energy.

hyao:

1. correct acceptance at edge dp for fe.
2. Check unreasonable cross section points for 15 deg runs.
3. Get acceptance for low energy for right arm.--->Done.--hyao 11:06, 28 April 2011 (UTC)
4. Q3 Cut with multi-dimensional dp/phi/theta/y cut.--->rvalue is the multi-d cut.--hyao 17:40, 9 April 2011 (UTC)
5. elastic runs with simulation to check if there's something in the magnet. plot phi vs W.---><math>\phi_{fp}</math> problem is caused by small scattering angle for right arm(<math>\phi_{tg}>0</math>).It can be cut by rvalue cut.--hyao 18:55, 9 April 2011 (UTC)

---><math>\theta_{fp}</math> problem is caused by Q3exit,in other words large dp range for right arm.It can be cut by q3exit cut.--hyao 16:37, 10 April 2011 (UTC)

---><math>y_{tg}</math> problem is caused by square react z generator, it should be like real target, has orientation.--hyao 20:41, 11 April 2011 (UTC)