[Olympus] [EXTERNAL] Re: Yield paper
Michael Kohl
kohlm at jlab.org
Sun Jul 12 21:30:19 EDT 2020
SeeDear Jan,
thank you for responding back.
The red blocks were to indicate (for myself and others, and not to modify t=
he figure) how big the normalization error is compared to the variation of =
the curves and point-to-point errors in Fig. 2, and the size of TPE correct=
ions in Fig. 3. This made me think that normalizing the data to world data =
may be more appropriate because the point-to-point errors are so much small=
er, and of the same order as the spread in the curves at low Q2, which I to=
ok as the uncertainty for the world data normalization.
Regarding additional data to MC comparisons, I also did not mean to include=
them in the paper but to have them ready as accompanying information, for =
us internally to convince ourselves of the systematic point-to-point errors=
, as well as for any requests in the peer review process. However, in Fig. =
1 an overlay with a digitized and reconstructed MC would be good to see.
Best regards,
Michael
________________________________
From: Jan C. Bernauer <jan.bernauer at stonybrook.edu>
Sent: Sunday, July 12, 2020 6:21 PM
To: Michael Kohl <kohlm at jlab.org>; Axel Schmidt <schmidta at mit.edu>
Cc: olympus <olympus at mit.edu>
Subject: Re: [EXTERNAL] Re: [Olympus] Yield paper
Hi Michael,
Thank you.
We'll go through it in more detail, but some things I can answer right now:
Author list. Axel and I are leading this, so we put us first,
alphabetically. We can talk about the remainder of the list, maybe we
should sort first the students who had a full analysis, and then
everybody else? I think we kept just the old order.
Generating more plots is not easy. I'm not sure Axel or I have the time.
We are also running out of space for the PRL.
Direct moeller/bhabha does not work. 7% is the estimated uncertainty of
the absolute lumi from MIE, as calculated by Axel.
Since we cannot give a good error for the slow ctrl lumi, we cannot
judge if the 1% is meaningful or not. It might indicate that the 7% is
too defensive, or it might be coincidence. If we take the beam
measurement at face value, we estimated roughly 5% error from other
sources. But they are very hard to quantify.
Since the SYMB with MIE is the only one were we can get a result and and
error, it's the luminosity we used.
We already discuss the TPE corrections in the fits. We are limited in
space here, it's a PRL after all. I do not think we should go into more
interpretation and shift the fits to the same point etc.
I do not understand what you mean with the red blocks. Fig 3 is show the
theoretical corrections applied. There is no normalization uncertainty
there.
Best,
Jan
On 7/12/2020 3:48 PM, Michael Kohl wrote:
> Dear Axel and Jan,
>
> thank you for sending the revised version right on time when I was
> about to start reviewing the draft.
>
> This is an excellent and important result, and a very well written paper.
>
> I provided all my comments in the attached PDF-edited version.
>
> My main point is this: Despite uncertainties of TPE prescriptions used
> in world data fits, the world data precision at the lowest Q2 point is
> still
> smaller than the 7.5% normalization uncertainty of the OLYMPUS data.
> This would suggest to move all data points down by ~2%, by using the
> available normalization via world data that is most precise.
>
> The power of this OLYMPUS data set would then be the Q2 evolution
> itself, and the absence of the cusp effect as seen in Jan's fit. Since
> the normalization uncertainty is 7.5% the data can not distingish
> between curves except between their shapes, and the curves are all
> pretty close to each other at the lowest Q2 point, by much less than
> 7.5%.
>
> Again, congrats on completing a very hard and tough piece of work!
>
> Best regards,
> Michael
>
>
>
>
> On Sat, 11 Jul 2020, Axel Schmidt wrote:
>
>> Dear Colleagues,
>> Thank you to the many of you have already reviewed the manuscript
>> and sent comments. Your suggestions were excellent and we've
>> implemented them all in the latest draft, attached below. If you
>> haven't read the paper yet, go ahead and start with this version.
>>
>> If you have any other suggestions, comments, concerns, complaints,
>> please send them to me by July 16th.
>>
>> Best regards,
>> Axel
>>
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>>> On Jul 8, 2020, at 15:05 , Douglas K Hasell <hasell at mit.edu> wrote:
>>>
>>> Dear Colleagues,
>>>
>>> Last week Axel sent out a draft of the new charge-averaged yield
>>> paper based on the OLYMPUS data. He requested that the
>>> collaboration read it, send comments, and approve it by 16 July,
>>> 2020, which is now just a week away. Please respond soon as we aim
>>> to post it to the arXiv and then submit to PRL soon afterwards. If
>>> we do not hear any reply we will assume you approve the paper as is.
>>>
>>> I have attached draft again.
>>>
>>> Cheers,
>>> Douglas
>>>
>>> 26-415 M.I.T. Tel: +1 (617) 258-7199
>>> 77 Massachusetts Avenue Fax: +1 (617) 258-5440
>>> Cambridge, MA 02139, USA E-mail: hasell at mit.edu
>>>
>>> ****+****1****+****2****+****3****+****4****+****5****+****6****+****7
>>>
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>
> +---------------------------------------------------------------------
> Dr. Michael Kohl, 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 office), +1-757-256-5122 (Cell)
> Email: kohlm at jlab.org
> +---------------------------------------------------------------------
--
Dr. Jan C. Bernauer
Assistant Professor
Department of Physics and Astronomy
Stony Brook University
Stony Brook, NY 11794-3800
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