[ee] draft slides

[vguzey at jlab.org]

Hi Pawel,

The slides look very nice!
I have several comments and suggestions:

1) I agree with Puneet that it would be helpful to give the explicit
expression (formula) for TCS and also maybe for J/Psi production in the
beginning of your talk, possibly in slide 2 or slide 3.

2) Slide 3: global analysis -> global analyses

3) In slide 4, I would recommend to decrease the size of DIS and DY
figures and ADD corresponding figures for DVCS and TCS so that one does
not have to wait until slide 7 to see the TCS graph.
Also, it is easier to appreciate the timelike-spacelike correspondence if
you present the graphs for DVCS and TCS.

4) Slide 5 (right lower corner). I think that the DVCS cross section
probes both Re and Im parts squared.

5) Slide 8: The equation in this slide is for DVCS! It is not consistent
with the graphs in this slide and with equations in slides 9 and 10
(e.g., the cross section in slide 8 does not depend on the angle phi).

6) Slide 8: when you discuss projection of the interference term, it is
useful to explain that this means taking moments with respect to the angle
phi which is defined in the next slide, just to indicate what is done in
practice (lepton charge conjugation may sound too abstract).

7) Slide 9: BH is large not only for small theta, but also for theta close
to pi.

8) Slide 10: I am not 100% sure that the phrase on the top of the slide
is technically correct: "To leading order, in terms...".
These are most general helicity amplitudes which receive contributions at
all orders; at leading order some of them (changing parton helicity) can
be simply zero. So, I would simply write:
"In terms of helicity amplitudes:"

My other comment to this slide that the second equation in slide 10 is
written at the leading accuracy (in the handbag approximation).
By the way, in this approximation all other helicity amplitudes
(Mtilde+(0-) and Mtilde(+-) are zero so only Mtilde(--) survives.

                             Good luck with the presentation!
                             Vadim





> Hello Everyone,
>
> I was hoping to circulate a draft of the slides before the presentation
> at the CLAS collaboration meeting this Wednesday, but I only had them
> ready at the last moment. The reason for this was not only that I was
> lazy, but also that the disk in my netbook died. You can find the
> current version of the slides, with only minor changes since Wednesday,
> here:
> https://userweb.jlab.org/~turonski/tcs/proposal/TCS_PAC39_v0.pdf
> One comment during the presentation was to make the importance of the
> J/Psi measurement for the TCS analysis clearer. I am still thinking how
> to do that in a compact way. Please let me know if you have comments or
> suggestions. I hope to have the next version ready this weekend. The PAC
> presentation will be on Tuesday.
>
> Best Regards,
>
>      Pawel
>
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