[Olympus] PRC report

[Jan C. Bernauer]

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
>> -------------- next part --------------
>> A non-text attachment was scrubbed...
>> Name: po.pdf
>> Type: application/pdf
>> Size: 14666 bytes
>> Desc: not available
>> Url : http://mailman.mit.edu/pipermail/olympus/attachments/20140205/84bddea8/attachment.pdf
>> -------------- next part --------------
>> A non-text attachment was scrubbed...
>> Name: po.eps
>> Type: application/postscript
>> Size: 11644 bytes
>> Desc: not available
>> Url : http://mailman.mit.edu/pipermail/olympus/attachments/20140205/84bddea8/attachment.eps
>> -------------- next part --------------
>> A non-text attachment was scrubbed...
>> Name: el.eps
>> Type: application/postscript
>> Size: 11749 bytes
>> Desc: not available
>> Url : http://mailman.mit.edu/pipermail/olympus/attachments/20140205/84bddea8/attachment-0001.eps
>> -------------- next part --------------
>> A non-text attachment was scrubbed...
>> Name: el.pdf
>> Type: application/pdf
>> Size: 14714 bytes
>> Desc: not available
>> Url : http://mailman.mit.edu/pipermail/olympus/attachments/20140205/84bddea8/attachment-0001.pdf
>> _______________________________________________
>> 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)
> |
> | Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
> | Phone: +49-40-8998-6406, Cell: +49-171-101-1967
> +---------------------------------------------------------------------
> _______________________________________________
> Olympus mailing list
> Olympus at mit.edu
> http://mailman.mit.edu/mailman/listinfo/olympus
> 


-- 
Dr. Jan C. Bernauer
Massachusetts Institute of Technology
77 Massachusetts Ave, Room 26-441
Cambridge, MA, 02139, USA
Phone:  (617) 253-6580