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Hi Setfan,</div>
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Thanks for the clarifications. I sent my comments to di-hadron paper wit hthe same comments and ask for clarifications. We should at least have the same numbers for two analyss form the same data sets.</div>
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REgards, Stepan</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Stefan Diehl <sdiehl@jlab.org><br>
<b>Sent:</b> Thursday, December 17, 2020 2:49 AM<br>
<b>To:</b> Stepan Stepanyan <stepanya@jlab.org><br>
<b>Cc:</b> clasmbr@jlab.org <clasmbr@jlab.org>; clascomment@jlab.org <clascomment@jlab.org>; raffaella.devita@ge.infn.it <raffaella.devita@ge.infn.it>; kyungseon.joo@uconn.edu <kyungseon.joo@uconn.edu>; Harut Avagyan <avakian@jlab.org>; Volker Burkert <burkert@jlab.org>;
Daniel Carman <carman@jlab.org>; Andrey Kim <kenjo@jlab.org>; sdiehl@jlab.org <sdiehl@jlab.org>; gangel@gwu.edu <gangel@gwu.edu>; milner@mit.edu <milner@mit.edu><br>
<b>Subject:</b> Re: OPT-IN: First multidimensional, high precision measurements of semi-inclusive pi+ beam single spin asymmetries from the proton over a wide range of kinematics</font>
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<div class="PlainText">Dear Stepan,<br>
<br>
The error of the beam polarisation is 2.6% (see RG-A analysis note). The<br>
stated 3.02% are the systematic uncertainty of the BSA which follows from<br>
the uncertainty of the beam polarisation when we propagate it in the BSA<br>
formula. This sould be corrected in the dihadron paper. It should be<br>
86.3%+/-2.6%.<br>
<br>
Beam charge asymmetry was studied (see RG-A note) and found to have an<br>
negligible effect on the result.<br>
<br>
Best regards,<br>
Stefan<br>
<br>
<br>
> In the dihadron paper, the beam polarization is quoted as 86.3%+/-3.02%,<br>
> in the single pion paper the error was 2.6%, why this difference?<br>
><br>
> One more quesiton, Did you studied beam charge asymmetry, it is included<br>
> in the definition of A_{LU} for di-hadron paper, Eq.(6), but has no value<br>
> (I ask to include the value)<br>
><br>
<br>
<br>
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