[Clascomment] OPT-IN: First multidimensional, high precision measurements of semi-inclusive pi+ beam single spin asymmetries from the proton over a wide range of kinematics

[Stepan Stepanyan]

Hi Setfan,

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.

REgards, Stepan
________________________________
From: Stefan Diehl <sdiehl at jlab.org>
Sent: Thursday, December 17, 2020 2:49 AM
To: Stepan Stepanyan <stepanya at jlab.org>
Cc: clasmbr at jlab.org <clasmbr at jlab.org>; clascomment at jlab.org <clascomment at jlab.org>; raffaella.devita at ge.infn.it <raffaella.devita at ge.infn.it>; kyungseon.joo at uconn.edu <kyungseon.joo at uconn.edu>; Harut Avagyan <avakian at jlab.org>; Volker Burkert <burkert at jlab.org>; Daniel Carman <carman at jlab.org>; Andrey Kim <kenjo at jlab.org>; sdiehl at jlab.org <sdiehl at jlab.org>; gangel at gwu.edu <gangel at gwu.edu>; milner at mit.edu <milner at mit.edu>
Subject: 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

Dear Stepan,

The error of the beam polarisation is 2.6% (see RG-A analysis note). The
stated 3.02% are the systematic uncertainty of the BSA which follows from
the uncertainty of the beam polarisation when we propagate it in the BSA
formula. This sould be corrected in the dihadron paper. It should be
86.3%+/-2.6%.

Beam charge asymmetry was studied (see RG-A note) and found to have an
negligible effect on the result.

Best regards,
Stefan


> In the dihadron paper, the beam polarization is quoted as 86.3%+/-3.02%,
> in the single pion paper the error was 2.6%, why this difference?
>
> One more quesiton, Did you studied beam charge asymmetry, it is included
> in the definition of A_{LU} for di-hadron paper, Eq.(6), but has no value
> (I ask to include the value)
>


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