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<div class="" style="word-wrap:break-word; line-break:after-white-space">Dear Tony,
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<div class="">I believe (but am not positive!) that this is an effect of Noémie using the following definition for the beam-spin asymmetry (which is the<i class=""> “</i>most correct” way to do it in light of the target polarizations etc.),</div>
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<div class="">Because there is a large charge difference between negative target helicities and positive target helicities and Pt+ != Pt- it manifests as a large difference away from 0 offset even for the beam-spin asymmetry without normalizing to the charge.
If Noémie started from the more familiar </div>
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<div class=""><span class="" style="background-color:rgb(254,254,254)">then there would be a negligible difference as you allude to between putting in raw counts or counts normalized by accumulated charge. This has been observed quite frequently in all RGA
(unpolarized H2 target) asymmetry extractions. I believe the original definition is safer and more general though.</span></div>
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<div class=""><span class="" style="background-color:rgb(254,254,254)">Regards,</span></div>
<div class=""><span class="" style="background-color:rgb(254,254,254)">Timothy<br class="">
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<div class="">On Sep 12, 2023, at 6:09 AM, Tony Forest via Rgc_analysis <<a href="mailto:rgc_analysis@jlab.org" class="">rgc_analysis@jlab.org</a>> wrote:</div>
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<div class=""><span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">*Message
sent from a system outside of UConn.*</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">Noémie</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">The
program "</span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__fcup-5Freading.cc_&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=aSEBncnFTdfouxOejKajYG--Ygz0DFQolIcHUhF20pw&m=qq3_RyxYgjlcOM_HJIv2M_kC5XxNWqAePVeIBkdQTNERhV0wRQMrujPSO4kpe0Ti&s=ddNaiviCn4LVC-ZVd4RRg8kpHXXsEZTvUOOJQckQ9xs&e=" class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">FCup_reading.cc</a><span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">"
reports FC asymmetries that are on the order</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">of
0.001 in natural units. Figures 16-18 show asymmetries that are on the</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">order
of 0.1.</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">Why
do the FC corrections shift the asymmetry so much when the FC</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">asymmetry
is so small?</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">Tony</span><br class="" style="font-family:Helvetica; font-size:18px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
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Dear all,<br class="">
Please find attached a note I wrote on the preliminary DVCS results I got<br class="">
with the NH3 runs that were cooked, with the intent of asking the DPWG for<br class="">
a release in order to talk at SPIN. The first part relates to the<br class="">
extraction of the target polarization and the second part to the<br class="">
extraction of pDVCS asymmetries. I would be happy to take any feedback<br class="">
into consideration !<br class="">
Best regards, Noémie._______________________________________________<br class="">
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