[Olympus] Preliminary version of PRC talk

[Brian S. Henderson]

Just one quick comment regarding the 12 degree MC/data comparison plots, 
I posted a new set of plots to the wiki that corrects the typo in the 
legend (although they also have 1.2 MC scaling rather than 1.1 which 
matches the left all six tracking better).  Just let me know if you 
would like me to remake any of the plots.  I can do that pretty quickly 
and easily.

Brian

On 4/19/2014 5:57 PM, Michael Kohl wrote:
> 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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