[Qweak_transverse_prl_comments] Fwd: [Q-weak] First draft of the Qweak elastic transverse asymmetry paper

[Buddhini Waidyawansa]

---------- Forwarded message ----------
From: Richard Jones <richard.t.jones at uconn.edu>
Date: Fri, Sep 26, 2014 at 1:49 PM
Subject: Re: [Q-weak] First draft of the Qweak elastic transverse asymmetry
paper
To: Buddhini Waidyawansa <buddhini at jlab.org>


Hello Buddhini,

Here are some corrections to the first draft of the transverse asymmetry
paper.

   1. p. 2, para 1: "This discrepancy was empirically shown to be resulting
   from a correction to the real part of the TPE amplitude which modify"...
   should be "which modifies"
   2. p. 2., para 2 right column, "It is a parity conserving, naively time
   reversal violating observable which vanish" should be "which vanishes"
   3. p.2 further down, "The asymmetry is generated by the interference ...
   and have the form" should be "has the form"
   4. There are several other cases further down that need to be fixed for
   subject-verb agreement
   5. p. 3 first column, "No correction was applied for these backgrounds.
   However their dilutions were taken into consideration when extracting the
   final asymmetry." This is confusing. If dilution factors were assigned and
   included in computing the final asymmetry then this is a correction. If
   dilution factors were estimated but not included as corrections, then these
   should be taken into consideration in estimating the error on the final
   asymmetry, but not its value.
   6. p.3 further down, "A unique false asymmetry in a beam normal single
   spin asymmetry experiment is a beam-normal single spin asymmetry Bt which
   is generated by the interference between one-photon exchange and the
   Z-exchange process." It is confusing to call this a "false asymmetry" since
   it is one of the terms in the full calculation of the transverse
   single-spin PV asymmetry. The fact that it is caused by Z-gamma
   interference rather than TPE-gamma interference does not make it "false". I
   would call this a competing process to TPE-gamma inteference contributing
   to this observable, although as you show, it is very small at these
   kinematics.  In my view, a false asymmetry is supposed to refer to some
   systematic effect arising from the imperfections of the beam or detectors.

It is a very good first draft.

-Richard Jones

-Richard J.

-- 
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Buddhini Waidyawansa
Postdoctoral Fellow
C122,
12000 Jefferson Ave,
Newport News, VA 23602.
TP 757-912-0410
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