[Olympus] Preliminary version of PRC talk

[Axel Schmidt]

Michael,
	Re: your page 12 comment:

> 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?

Speaking with Brian, I confirmed that the MC for e+ and the MC for e- are separate. The radiative generator inverts the sign of the charge-odd terms (i.e. soft TPE) depending on the beam charge, so keeping separate MC data sets is the proper thing to do. 

Cheers,
Axel

On Apr 19, 2014, at 17:57 , 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
>> _____________________________________________________
>> 
>> _______________________________________________
>> Olympus mailing list
>> Olympus at mit.edu
>> http://mailman.mit.edu/mailman/listinfo/olympus
>> 
> 
> +---------------------------------------------------------------------
> | Dr. Michael Kohl, Associate Professor and Staff Research Scientist
> | Physics Department, Hampton University, Hampton, VA 23668
> | Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
> | Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
> | Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
> | Email: kohlm at jlab.org, Cell: +1-757-256-5122 (USA)
> +---------------------------------------------------------------------
> _______________________________________________
> Olympus mailing list
> Olympus at mit.edu
> http://mailman.mit.edu/mailman/listinfo/olympus