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Thank you, Ashot, for your short description. At 0.1 degree, the bulk of the events are within the He4 dimension (3.36 fm).</div>
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tks ig.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Primexd <primexd-bounces@jlab.org> on behalf of gasparan via Primexd <primexd@jlab.org><br>
<b>Sent:</b> Friday, December 13, 2024 9:38 AM<br>
<b>To:</b> Viviana Arroyave Flechas <varro008@fiu.edu><br>
<b>Cc:</b> primexd@jlab.org <primexd@jlab.org><br>
<b>Subject:</b> Re: [Primexd] [EXTERNAL] PrimEx Weekly meeting</font>
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Hi Igal and All,<br>
<br>
As we discussed last week and decided to have a short description <br>
physics<br>
picture for the Primakoff process (others are similar too) I am <br>
itemizing<br>
my statements regarding specifically for the Primakoff part.<br>
<br>
1) The so-called Primakoff process is a fusion of a beam photon and one <br>
of<br>
the photon from the nuclear field (the distribution of virtual <br>
photons<br>
around the nuclei is well known in QED.<br>
2) Since we know the production angle: typically 0.1 degree, calculate <br>
the<br>
momentum of the photon that picked up during this process.<br>
3) calculate the wavelength of this photon using either the de <br>
Broigle's (check the<br>
spelling) formula (labda = hach/momenta) or the uncertainty <br>
principle.<br>
4) once you have the wavelength compere that with the radius of the <br>
nuclei (He4).<br>
5) the quantum picture of physics (the scaling concept) will tell that <br>
a photon<br>
with a few times of the nuclei will see the target as one-hole <br>
object.<br>
<br>
That is basically it, the rest is more painful simulations using <br>
lengthy<br>
formulas.<br>
<br>
Ashot<br>
<br>
On 2024-12-12 17:59, Viviana Arroyave Flechas via Primexd wrote:<br>
> Dear colleagues,<br>
> <br>
> This is a reminder that the next PrimEx-eta weekly meeting will be<br>
> held tomorrow at 3PM. Please add any updates and/or agenda items you<br>
> may have to the wiki page here:<br>
> <br>
> <a href="https://halldweb.jlab.org/wiki-private/index.php/Dec_13,_2024_PrimEx-Eta_Meeting">
https://halldweb.jlab.org/wiki-private/index.php/Dec_13,_2024_PrimEx-Eta_Meeting</a><br>
> <br>
> <br>
> For convenience, here is a link to the zoom meeting:<br>
> <br>
> <a href="https://jlab-org.zoomgov.com/j/1610006900?pwd=M2c0eU1senhHTUNYMElnT3Z2NEpwZz09">
https://jlab-org.zoomgov.com/j/1610006900?pwd=M2c0eU1senhHTUNYMElnT3Z2NEpwZz09</a><br>
> [1]<br>
> <br>
> Zoom Meeting ID: 161 000 6900<br>
> Zoom Meeting Password: 656051<br>
> <br>
> Kind regards,<br>
> Viviana Arroyave<br>
> <br>
> <br>
> <br>
> Links:<br>
> ------<br>
> [1] <br>
> <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1610006900-3Fpwd-3DM2c0eU1senhHTUNYMElnT3Z2NEpwZz09&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=lU05Rh9aCuulfMNDTEUwllfR5wGoS__-zKJvNoD4iqU&m=0R5b94r0JCrXFFB4Kh_XeVnh21tZgcFqueprBgTgdgC94LF85w1wbMk1JngYukdu&s=_55dY0yKmV4rnUE4g7bsPVEWZ2PLrT1sU1ozmgYxKmQ&e=">
https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1610006900-3Fpwd-3DM2c0eU1senhHTUNYMElnT3Z2NEpwZz09&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=lU05Rh9aCuulfMNDTEUwllfR5wGoS__-zKJvNoD4iqU&m=0R5b94r0JCrXFFB4Kh_XeVnh21tZgcFqueprBgTgdgC94LF85w1wbMk1JngYukdu&s=_55dY0yKmV4rnUE4g7bsPVEWZ2PLrT1sU1ozmgYxKmQ&e=</a><br>
> _______________________________________________<br>
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