<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Dear Colleagues,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Please find below the analytical evaluations for BSA uncertainties: a) the absolute uncertainty values \DeltaA (next to bottom string); b) relative \DeltaA/A values (bottom string)</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
As you may see, the relative DeltaA/A uncertainty is described by the product of two terms. The second (from left to right) term is proportional 1/sqrt(N+-N-), as FX mentioned. However, the first term 1/(N+-N-) inflates DeltaA/A values for A<0.1, which a typical
values for the BSA in the N* region. For this reason, statistics matters, in particular in the resonance region where the statistics is much smaller in comparison with the DIS region.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Best Regards,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Victor<br>
</div>
<div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div id="appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b> From:</b> Viktor Mokeev <mokeev@jlab.org><br>
<b>Sent:</b> Friday, February 5, 2021 9:38 AM<br>
<b>To:</b> Viktor Mokeev <mokeev@jlab.org><br>
<b>Subject:</b> </font>
<div> </div>
</div>
<div dir="auto">
<div dir="ltr"><br>
<br>
<img id="x_7FBBD864-40AB-4B10-8A83-38966C87C819" style="max-width: 100%; height: auto;" data-outlook-trace="F:1|T:1" src="cid:7FBBD864-40AB-4B10-8A83-38966C87C819"></div>
<br>
<br>
<div dir="ltr">Sent from my iPhone</div>
</div>
</div>
</body>
</html>