[Rgc_analysis] [EXTERNAL] Re: Cut for FC asymmetry measurement

[Hayward, Timothy]

Dear Tony,

Thank you for looking into this. I must admit that I’m not entirely sure I follow the full line of reasoning (and unfortunately I had to leave early on Tuesday). I tried redoing my epX fits with the accumulated charges that come straight out of HEL_SCALER and with imposing your suggested getFloat("clock",0) > 30000 and, as you allude to, it thankfully makes a very very negligible difference. For example, for the PT beam-spin asymmetry: a + b sin(phi) for the a values I get (the first value is <PT>, the second value is a and the third value is the uncertainty on a):

{{0.123649, 0.000562477, 0.00130613}, {0.275275, -0.000327254, 0.000762493}, {0.444372, 0.00003, 0.0007719}, {0.616924, -0.00067699, 0.00108001}, {0.833187, -0.00337556, 0.00161188}}

vs

{{0.123649, 0.000563902, 0.00130613}, {0.275275, -0.000325848, 0.000762493}, {0.444372, 0.000032, 0.0007719}, {0.616924, -0.000675556, 0.00108001}, {0.833187, -0.00337414, 0.00161188}}




A similar story for the target-spin asymmetry:


I observed a similar negligible effect on the extraction of dilution factors.

Best regards,
Timothy


On Aug 1, 2023, at 9:43 AM, tforest--- via Rgc_analysis <rgc_analysis at jlab.org<mailto:rgc_analysis at jlab.org>> wrote:

*Message sent from a system outside of UConn.*


Fellow collaborators:

Base on today's discussion, I would suggest changing the line in
FCcup_reading.cc<https://urldefense.proofpoint.com/v2/url?u=http-3A__fccup-5Freading.cc_&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=aSEBncnFTdfouxOejKajYG--Ygz0DFQolIcHUhF20pw&m=4iYZun8w4Flyo9wWCOwsSC05I_d4LAuN1cggtVq_g4H78p2eLLuOdLnVdDs6S7Gv&s=XP3Zi5aHXfjV9uY28vb0WeeILC4ROa_qVPLuTdJii-M&e= > from

if(HEL_SCALER.getRows()>0)

to be

if(HEL_SCALER.getRows()>0 && HEL_SCALER.getFloat("clock",0) > 30000)

It should help ensure reliable results.  Only one run, 16535, had a
relative changed of more than 1% with the suggested cut above.

Tony

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