[Olympus] Preliminary version of PRC talk

[Michael Kohl]

Dear Uwe,

I think this looks quite good already. Few comments below.

page 4: the ratio formula ... the notation is somewhat unclear.
The effect of the 1gamma+2gamma interference on the cross section ratio is 
4 times the real part of the product of 1-gamma^* and 2-gamma 
'amplitudes'. 
Alternatively, introduce delta_2gamma as a correction to the Born cross 
section via (sigma_Born(1 +- delta_2gamma), then the cross section ratio 
is e+/e- = 1 + 2*delta_2gamma (some people define it with the opposite 
sign).

page 5: Swedish o/ in Moller

page 8:
SC lumi: I would assign ~20% to the absolute uncertainty. 'Relative' 
should be specified or distinguished for e+/e-, or as 'relative to the 
mean' of the same species as a function of time.

12deg: Add: two independent sectors or arms

SYMB: Add: symmetric e+- e scattering, coincident

page 10: 'any' four planes (like same bullet on page 11)

do you want to show the momentum plot and advertise the progress made with 
the radiated MC, and the accounting of internal and external 
bremsstrahlung?

page 12: if the radiated MC is used here: has it been different for e+ 
and e- runs, or one average MC for for all?

page 17: Monte Carlo cross section - is this the toy MC (I think yes), and 
is the run dependence already reflecting the final BPM calib (I think it 
is just the raw fluctuations, not yet calibrated)?

page 18: "SYMB cross section": If I understand this correctly, this is 
simply "counts divided by SC Lumi", so it is something like 
"acceptance-integrated SYMB cross section".

Say something like 'realistic acceptance-intergated MC cross sections are 
needed before SYMB lumi can be meaningful' -> work in progress.
"Run-by-run fluctuations due to beam position and slope will be properly 
accounted for in MC"

page 21: the plot on the bottom right should be bigger, it shows that the 
problem has been solved

page 22: make plots bigger


The other parts look fine to me.

Happy Easter and best regards
    Michael


On Sat, 19 Apr 2014, Uwe Schneekloth wrote:

> Dear Colleagues,
>
> I just put a preliminary version my PRC talk on the wiki. I tried to give
> an overview of the present status. Details will be discussed in the
> pre-meeting on Wednesday.
>
> Please let me know if you have comments, suggestions, ... or any
> updates.
>
> Best regards,
> Uwe
>
> https://olympus-docu.hiskp.uni-bonn.de/dokuwiki/doku.php?id=desy-prc77
>
> _____________________________________________________
> |
> | Dr. Uwe Schneekloth
> | OLYMPUS
> | Deutsches Elektronensynchrotron
> | Notkestrasse 85
> | D-22603 Hamburg/Germany
> | Tel: +49-40-8998 2007  Fax: +49-40-8998 3092
> | email: uwe.schneekloth at desy.de
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