<div dir="ltr"><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Richard Jones</b> <span dir="ltr"><<a href="mailto:richard.t.jones@uconn.edu">richard.t.jones@uconn.edu</a>></span><br>Date: Fri, Sep 26, 2014 at 1:49 PM<br>Subject: Re: [Q-weak] First draft of the Qweak elastic transverse asymmetry paper<br>To: Buddhini Waidyawansa <<a href="mailto:buddhini@jlab.org">buddhini@jlab.org</a>><br><br><br><div dir="ltr">Hello Buddhini,<div><br></div><div>Here are some corrections to the first draft of the transverse asymmetry paper.</div><div><ol><li>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"</li><li>p. 2., para 2 right column, "It is a parity conserving, naively time reversal violating observable which vanish" should be "which vanishes"</li><li>p.2 further down, "The asymmetry is generated by the interference ... and have the form" should be "has the form"</li><li>There are several other cases further down that need to be fixed for subject-verb agreement</li><li>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.</li><li>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.</li></ol><div>It is a very good first draft.</div></div><div><br></div><div>-Richard Jones</div><div><br></div><div>-Richard J.</div></div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><font face="georgia, serif">-------------------------------------------------------------------<br>Buddhini Waidyawansa<br></font>Postdoctoral Fellow<br>
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