[G14_run] [EXTERNAL] Re: g14 meeting tomorrow at 9:00 am JLab time

[Tsuneo Kageya]

Hi Haiyun,

 thank you for the response.

(1)  It is still hard to understand how both data share the same W range.
 There are two data samples which are different energy data (1.8 and 2.0 GeV) and show different W ranges in your slides.
 What kinds of cuts you applied to them excluding common basic cuts ?

(2) Both of data used to extract Sigmas in your slides are from samples of coherent
edge - Eg are larger than 200 MeV ?

         Regards, Tsuneo Kageya.
________________________________
From: Haiyun Lu <haiyun.lu at gmail.com>
Sent: Wednesday, July 16, 2025 2:38 PM
To: Tsuneo Kageya <kageya at jlab.org>
Cc: igor at gwu.edu <igor at gwu.edu>; g14 run <g14_run at jlab.org>; Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it>
Subject: Re: [EXTERNAL] Re: g14 meeting tomorrow at 9:00 am JLab time

Hi Tsuneo,

Sorry for the late reply. I believe you are asking why the 2000 MeV coherent-edge data is at the same distance away from the coherent edge as 1800 MeV data, although they are from different W ranges.
I don't have the complete answer but my understanding is that it is from some intensional selections and other accidental factors.

The same range means that the farest points for these two are the same. I believe this is because of the same requirement of beam polarization, i.e. the beam polarization needs to be greater than 10%. This 10% is applied on different coherent-edge runs.
If the correlation of beam polarization with the distance of beam energy to the coherent edge is the same/similar, we would expect the largest distance is the same or similar for different coherent-edge runs. In this case, it's around 0.45.

The correlation between the W and beam energy is the same, which is the concentrated slope. Since it is mastered by the kinematics, it is expected to be the same.

The last factor is accidental and not intentional. The 1800 MeV data covers from 1.84 to 1.9 about 60 MeV, while 2000 MeV data covers from 1.93 to 1.98 about 50 MeV. They are very close and therefore show the same/similar lower limit of the distance of energy to the coherent edge.

I hope this can explain it.

Regards,
Haiyun


On Thu, Jul 10, 2025 at 3:34 PM Tsuneo Kageya <kageya at jlab.org<mailto:kageya at jlab.org>> wrote:
Hi Haiyun,

 I have a question about your yesterday's presentation.

 How did you get the data from 2000 MeV with the same cohe-edgde - Eg and W
as 1800 MeV data ?
 I am still confused.    From the second page, 2000 MeV data seem to have similar cohe-dedge - Eg, but higher W range than 1800 MeV data ?

 Thank you.

        Regards, Tsuneo Kageya.
________________________________
From: Haiyun Lu <haiyun.lu at gmail.com<mailto:haiyun.lu at gmail.com>>
Sent: Wednesday, July 9, 2025 10:21 AM
To: Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it<mailto:annalisa.dangelo at roma2.infn.it>>
Cc: igor at gwu.edu<mailto:igor at gwu.edu> <igor at gwu.edu<mailto:igor at gwu.edu>>; Tsuneo Kageya <kageya at jlab.org<mailto:kageya at jlab.org>>; g14 run <g14_run at jlab.org<mailto:g14_run at jlab.org>>
Subject: [EXTERNAL] Re: g14 meeting tomorrow at 9:00 am JLab time

The presentation is attached.

On Tue, Jul 8, 2025 at 1:09 PM Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it<mailto:annalisa.dangelo at roma2.infn.it>> wrote:

Dear All,

to continue the discussion on the Analysis note status, let's meet for a g14 meeting  tomorrow  at 9:00 am JLab time.


The link to the Zoom meeting is the following:

https://jlab-org.zoomgov.com/j/1608547947?pwd=M1ZRc3k1dTlWek1Tb1o3V25uWlN1Zz09<https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547947-3Fpwd-3DM1ZRc3k1dTlWek1Tb1o3V25uWlN1Zz09&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=5LSWsFN5KweowPCsdwCuT6TNyYmHKJ3RcKK8qa-oO-g&m=a5rjQAEeKmo8bQtcVy3QdyKUoET0we9Jt90VgYZE6f5cVzmGbAKur5SnZuc9MtqW&s=qL3Z8lhB8Nm9KfOxpgaaYb7k-RjuLS1_ioAftn0b57w&e=>

meeting id is

160 854 7947


if required passcode is

396000.

All the best
Annalisa

--
================================================
Prof. Annalisa D'Angelo
Dip. Fisica, Universita' di Roma "Tor Vergata"
Istituto Nazionale di Fisica Nucleare
Sezione di Roma Tor Vergata, Rome Italy
email:annalisa.dangelo at roma2.infn.it<mailto:email:annalisa.dangelo at roma2.infn.it>
Jefferson Laboratory, Newport News, VA USA
Email: annalisa at jlab.org<mailto:annalisa at jlab.org>
Tel: + 39 06 72594562

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