[Primexd] [EXTERNAL] PrimEx Weekly meeting

[Igal Jaegle]

Thank you, Ashot, for your short description. At 0.1 degree, the bulk of the events are within the He4 dimension (3.36 fm).

tks ig.
[cid:3ec5b453-7b8d-45e7-afe3-71112bf4d782]



________________________________
From: Primexd <primexd-bounces at jlab.org> on behalf of gasparan via Primexd <primexd at jlab.org>
Sent: Friday, December 13, 2024 9:38 AM
To: Viviana Arroyave Flechas <varro008 at fiu.edu>
Cc: primexd at jlab.org <primexd at jlab.org>
Subject: Re: [Primexd] [EXTERNAL] PrimEx Weekly meeting


   Hi Igal and All,

  As we discussed last week and decided to have a short description
physics
  picture for the Primakoff process (others are similar too) I am
itemizing
  my statements regarding specifically for the Primakoff part.

  1) The so-called Primakoff process is a fusion of a beam photon and one
of
     the photon from the nuclear field (the distribution of virtual
photons
     around the nuclei is well known in QED.
  2) Since we know the production angle: typically 0.1 degree, calculate
the
     momentum of the photon that picked up during this process.
  3) calculate the wavelength of this photon using either the de
Broigle's (check the
     spelling) formula (labda = hach/momenta) or the uncertainty
principle.
  4) once you have the wavelength compere that with the radius of the
nuclei (He4).
  5) the quantum picture of physics (the scaling concept) will tell that
a photon
     with a few times of the nuclei will see the target as one-hole
object.

  That is basically it, the rest is more painful simulations using
lengthy
  formulas.

  Ashot

On 2024-12-12 17:59, Viviana Arroyave Flechas via Primexd wrote:
> Dear colleagues,
>
>  This is a reminder that the next PrimEx-eta weekly meeting will be
> held tomorrow at 3PM. Please add any updates and/or agenda items you
> may have to the wiki page here:
>
> https://halldweb.jlab.org/wiki-private/index.php/Dec_13,_2024_PrimEx-Eta_Meeting
>
>
>  For convenience, here is a link to the zoom meeting:
>
> https://jlab-org.zoomgov.com/j/1610006900?pwd=M2c0eU1senhHTUNYMElnT3Z2NEpwZz09
> [1]
>
>  Zoom Meeting ID: 161 000 6900
>  Zoom Meeting Password: 656051
>
>  Kind regards,
>  Viviana Arroyave
>
>
>
> Links:
> ------
> [1]
> 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=
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