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John: Looking at efficiency plots for Lucite bars.

Plotted efficiency versus position. Efficiency is defined:<br>

<br>

Hit in lucite (both left and right side) + Cerenkov + Tracker+BigCal /

Hit in Cerenkov + Tracker+BigCal<br>

<br>

For parallel run (72490) sees about 50% efficiency and about 25% for

perp run (72957). Will check for cut on cluster energy and also look at

timing (TDC). Results seems fairly reasonable.<br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/german/72490/smallbin/eff_bars_1_thru_9_72490.eps">https://hallcweb.jlab.org/experiments/sane/german/72490/smallbin/eff_bars_1_thru_9_72490.eps</a><br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/german/72490/smallbin/eff_bars_10_thru_18_72490.eps">https://hallcweb.jlab.org/experiments/sane/german/72490/smallbin/eff_bars_10_thru_18_72490.eps</a><br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/german/72490/smallbin/eff_bars_19_thru_27_72490.eps">https://hallcweb.jlab.org/experiments/sane/german/72490/smallbin/eff_bars_19_thru_27_72490.eps</a><br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/german/72957/smallbin/eff_bars_1_thru_9_72957.eps">https://hallcweb.jlab.org/experiments/sane/german/72957/smallbin/eff_bars_1_thru_9_72957.eps</a><br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/german/72957/smallbin/eff_bars_10_thru_18_72957.eps">https://hallcweb.jlab.org/experiments/sane/german/72957/smallbin/eff_bars_10_thru_18_72957.eps</a><br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/german/72957/smallbin/eff_bars_19_thru_27_72957.eps">https://hallcweb.jlab.org/experiments/sane/german/72957/smallbin/eff_bars_19_thru_27_72957.eps</a><br>

<br>

<br>

<u><b>James:</b></u> Looked further in to mysterious change in sign of

measured double-spin asymmetries noticed for 3 particular runs

(72945-72947). It was assumed that 3 runs may have had their hwp status

inexplicably changed during data taking on March 8 2009. This was seen

in the EPICS, but Hall A was also taking data at this time and didn't

see that. Now thinking it could be due to an IOC reboot that occurred

around that time as well.<br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw_Asymmetries#Half_Wave_Plate_Status_Follow-up:_11.2F17.2F2010">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Raw_Asymmetries#Half_Wave_Plate_Status_Follow-up:_11.2F17.2F2010</a><br>

Working some more on tracking to Front Tracker. Fixed a bug in his code

where he was applying a fitting factor of 0.3 one too many times. The

tracking seemed to be bending opposite of its actual direction. This

was due to a sign convention that needed to be applied.<br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Particle_Tracking_to_Front_Tracker%2C_Target#Tight_Cuts:_Phi_Bdl_lab_vs_Phi_e:_11.2F17.2F2010">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Particle_Tracking_to_Front_Tracker%2C_Target#Tight_Cuts:_Phi_Bdl_lab_vs_Phi_e:_11.2F17.2F2010</a><br>

<br>

<br>

Anusha: Comparing data and MC for a Carbon run (72870).

Correcting optics in MC with a 1st order SR correction. Getting better

agreement between data and MC. Though xptarg is still some off. Will

try using SR correction used in SIMC. Will also look at plotting W vs.

xptarg. Oscar suggested that Hoyoung and/or Narbe look at this Carbon

run as well with the MC they use for getting packing fractions.<br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/MC_with_NH3">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/MC_with_NH3</a>&nbsp;

**(Bottom, lower right side plot)<br>

<br>

<br>

<u><b>Narbe:</b></u> Looked at physics angle and position distributions

with current SANE-GEANT. Looked at parallel, perp, and no field

settings. Compared throwing electrons and positrons for the physics

angles. This was done partly because Jon was comparing the current

version of the SANE-GEANT with the original version and was seeing a

difference in distributions in regard to the gain volume, which is

based on the surface area of BigCal. One key difference to note is that

both the generated and reconstructed parts in the current version rely

on there being a cluster event. Also, the peculiar structures seen in

the reconstructed physics angle distributions may be from a flag

requiring the Cerenkov fire before reconstructing, possibly photonic.<br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/SANE_GEANT#11.2F17.2F2010">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/SANE_GEANT#11.2F17.2F2010</a><br>

Also working on the kinematics binning.<br>

<br>

<br>

<u><b>Luwani:</b></u> Looking at pi0 decay. Working on calculating pi0

energy from the determined pi0 mass to compare with electron energy for

background. <br>

<a class="moz-txt-link-freetext" href="https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Background_from_Pi0_decay">https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Background_from_Pi0_decay</a><br>

<br>

<br>

As always, please let me know if I missed anything or if I made any

mistake(s).<br>

<br>

Next meeting will be December 2 ate 3:30pm, after Turkey Day.<br>

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