[Olympus] PRC report

[Belostotski, Stanislav]

Dear Jan,
Are you opposing to show the ratio, as Michael has proposed, or
two plots in log scale sent by me before?
In latter case I would be puzzled. This would show only that "by the 
order of value" the measured yields are close to MC.
If we show only data without MC that will provoke immediate questions 
about MC expectation.
Why do you think that the PRC would take it as a sort of final result 
which we are still so far from?
So I propose either to show the data and MC or exclude this yield vs Q2 
(Fig.12) at all ( my previous  suggestion).
With best regards Stan


On 05.02.2014 18:26, Jan C. Bernauer wrote:
> Dear all,
>
> please do NOT do that. We are already dangerously close to produce and
> release a "result". To be honest, even the comparison like it is now is
> too close for comfort for me. The non-MC corrected yield in a log plot
> was the furthest I'm willing to go.
>
> Dividing the measurement by MC gives almost directly the ratio we are
> after - you only have to divide the two numbers in the plot. This most
> certainly can not go in the PRC report. And quite frankly, I'm not sure
> why we even entertained the thought of blinding the data when we go and
> produce results, which will without doubt bias us, the first chance we get?
>
> So I'm opposed to producing this plot even for internal use.
>
>
> With best regards,
> Jan
>
>
> On 2/5/14, 9:03 AM, Michael Kohl wrote:
>> 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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