<div dir="ltr">Hi Ashot,<div><br></div><div>The screenshot that he included points to this paper: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__inspirehep.net_literature_247256&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=V3XNY-MaMKN2LuAaTdObrA&m=U-LTR2a5xJTpbURHMu6XhDfdKFB_-eBNhUWmLmw43mdFUsZW8OV0cIgDkyNTSyGt&s=OgxTFqtGw6802BwNrez_CaraY_44hEivg4_csJasntM&e=">https://inspirehep.net/literature/247256</a></div><div><br></div><div>I'm a little on the fence as to whether it is worthwhile to include. It provides some equations, but is primarily focused on pseudoscalars with mass <10^(-4) eV. We definitely don't have the sensitivity/resolution for that, that I'm aware of. The proposed experiment in the paper is certainly interesting, but I'm not sure that JLab would be the ideal place to do it:</div><div><br></div><div>It requires a polarized photon beam (so Hall B or D)</div><div>A magnet with field parallel to the photon polarization to convert it to a pseudoscalar</div><div>A wall to block real photons</div><div>Another magnet with field parallel to the photon polarization to convert the pseudoscalar back to a photon</div><div>A PMT to detect the photon</div><div><br></div><div>I suppose the tagger magnets could be the first one and that a wall could be constructed. But, then we'd need another magnet in the hall. I don't think there's room in Hall D, which then leaves Hall B. It doesn't explicitly say, but it reads as is there is no/minimal deflection so that the photon would go straight down the beam pipe.</div><div><br></div><div>All this to say, I don't see how it is tremendously relevant to our experiment. Let me know if you disagree when you have a chance to take a look at it.</div><div><br></div><div>Best,</div><div>Tyler</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jan 21, 2023 at 8:24 AM gasparan--- via PRad <<a href="mailto:prad@jlab.org">prad@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Hi Tyler,<br>
If you have a time look at this reference that Bogdan thinks is very good<br>
for our search paper. I spent some time yesterday and could not identify<br>
the right one.<br>
Thanks,<br>
Ashot<br>
<br>
---------------------------- Original Message ----------------------------<br>
Subject: Re: Fw: [PRad] [EXTERNAL] Re: X17 White Paper<br>
From: "Bogdan Wojtsekhowski" <<a href="mailto:bogdanw@jlab.org" target="_blank">bogdanw@jlab.org</a>><br>
Date: Fri, January 20, 2023 5:55 pm<br>
To: "<a href="mailto:gasparan@jlab.org" target="_blank">gasparan@jlab.org</a>" <<a href="mailto:gasparan@jlab.org" target="_blank">gasparan@jlab.org</a>><br>
--------------------------------------------------------------------------<br>
<br>
Yes, he is in so many papers. This one in PRL is quite popular and<br>
even related to a very low mass range, tells well about physics motivation<br>
to search in 2-gamma final state which PRIMEX can do very well.<br>
<br>
<br>
________________________________<br>
From: <a href="mailto:gasparan@jlab.org" target="_blank">gasparan@jlab.org</a> <<a href="mailto:gasparan@jlab.org" target="_blank">gasparan@jlab.org</a>><br>
Sent: Friday, January 20, 2023 4:47 PM<br>
To: Bogdan Wojtsekhowski <<a href="mailto:bogdanw@jlab.org" target="_blank">bogdanw@jlab.org</a>><br>
Subject: Re: Fw: [PRad] [EXTERNAL] Re: X17 White Paper<br>
<br>
<br>
Hi Bogdan,<br>
Karl van Bibber has many articles on this matter, can you please<br>
direct to which one.<br>
<br>
Also, I went through your proposals and we may discuss it in next<br>
week during the 22+ GeV conference, if you have some time for that.<br>
<br>
Thanks,<br>
Ashot<br>
<br>
> Hi Ashot,<br>
><br>
> The search for a new particle in A-> gamma + gamma mode was discuss in<br>
> paper by Karl van Bibber. It may be will be a good reference.<br>
><br>
> Bogdan<br>
><br>
> ________________________________<br>
> From: PRad <<a href="mailto:prad-bounces@jlab.org" target="_blank">prad-bounces@jlab.org</a>> on behalf of Tyler Hague via PRad<br>
> <<a href="mailto:prad@jlab.org" target="_blank">prad@jlab.org</a>><br>
> Sent: Friday, January 20, 2023 2:11 PM<br>
> To: <a href="mailto:prad@jlab.org" target="_blank">prad@jlab.org</a> <<a href="mailto:prad@jlab.org" target="_blank">prad@jlab.org</a>><br>
> Subject: [PRad] [EXTERNAL] Re: X17 White Paper<br>
><br>
> Hello everyone,<br>
><br>
> As discussed today in the PRad meeting, I have finalized the edits based<br>
> on comments received. While we were unfortunately too late in completing<br>
> this to be submitted as a white paper, we have opted to upload it to the<br>
> arXiv so that it may be available for reference as it contains new work.<br>
><br>
> Attached is the document, as submitted. It will be announced on the arXiv<br>
> on Monday. When I receive the announcement confirmation, I will send<br>
> everyone the identifier and the password to claim the authorship of the<br>
> document.<br>
><br>
> Best,<br>
> Tyler<br>
><br>
> On Fri, Jan 6, 2023 at 8:45 PM Tyler Hague<br>
> <<a href="mailto:tjhague@lbl.gov" target="_blank">tjhague@lbl.gov</a><mailto:<a href="mailto:tjhague@lbl.gov" target="_blank">tjhague@lbl.gov</a>>> wrote:<br>
> Hello everyone,<br>
><br>
> In today's meeting we discussed the X17 White Paper and said that I would<br>
> send it around after a final read-through. It is attached to this message.<br>
> Please take a look at it and send any comments.<br>
><br>
> Best,<br>
> Tyler<br>
><br>
<br>
<br>
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</blockquote></div>