[Olympus] PRC report

[Michael Kohl]

Dear Stan, Yury,

the logarithmic scale is hiding certain features.
Can you produce a plot of the ratios (data/MC) for e+ and e- ? This should 
take out the leading Q2 dependence and help identify the problem zones.

The enhanced e- yield at backward angle was already present in Jan's plot 
from October.

Best regards
   Michael


On Wed, 5 Feb 2014, Belostotski, Stanislav wrote:

> Dear Douglas and Jan,
> Find please attached two plots (eps and pdf each)
> showing comparison experimental yields with MC. The normalization is
> done as follows:
> Experimental distributions are normalized one to another under condition
> that at Q2 around 1 GeV2 the ratio e+/e- must be equal to 1 ( as I
> understand we used the same philosophy as  Jan did) ;
> The e- MC points are normalized to experiment at Q2=0.65.
> I avoid to combine both plots in one (too messy). To be honest, they are
> anyway independent as we have not used normalization to luminosity.
> To me the results look good enough. The enhancement around Q2=4 for
> positrons has already been well explained by Jan. I am puzzled by excess
> of experiment over MC at Q2 larger 1.5 for electrons (somewhat similar
> but much less pronounced for positrons). Is that bgr contamination?
> Might be, but it looks rather as a shift by whatever reason.
> kind regards Stan,Yuri
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| Dr. Michael Kohl, Associate Professor and Staff Research Scientist
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