[PRad] [Fwd: Re: Fw: [EXTERNAL] Re: X17 White Paper]

[Tyler Hague]

Hi Ashot,

The screenshot that he included points to this paper:
https://urldefense.proofpoint.com/v2/url?u=https-3A__inspirehep.net_literature_247256&d=DwIBaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=V3XNY-MaMKN2LuAaTdObrA&m=U-LTR2a5xJTpbURHMu6XhDfdKFB_-eBNhUWmLmw43mdFUsZW8OV0cIgDkyNTSyGt&s=OgxTFqtGw6802BwNrez_CaraY_44hEivg4_csJasntM&e= 

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:

It requires a polarized photon beam (so Hall B or D)
A magnet with field parallel to the photon polarization to convert it to a
pseudoscalar
A wall to block real photons
Another magnet with field parallel to the photon polarization to convert
the pseudoscalar back to a photon
A PMT to detect the photon

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.

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.

Best,
Tyler

On Sat, Jan 21, 2023 at 8:24 AM gasparan--- via PRad <prad at jlab.org> wrote:

>
>   Hi Tyler,
>  If you have a time look at this reference that Bogdan thinks is very good
>  for our search paper. I spent some time yesterday and could not identify
>  the right one.
>  Thanks,
>  Ashot
>
> ---------------------------- Original Message ----------------------------
> Subject: Re: Fw: [PRad] [EXTERNAL] Re: X17 White Paper
> From:    "Bogdan Wojtsekhowski" <bogdanw at jlab.org>
> Date:    Fri, January 20, 2023 5:55 pm
> To:      "gasparan at jlab.org" <gasparan at jlab.org>
> --------------------------------------------------------------------------
>
> Yes, he is in so many papers. This one in PRL is quite popular and
> even related to a very low mass range, tells well about physics motivation
> to search in 2-gamma final state which PRIMEX can do very well.
>
>
> ________________________________
> From: gasparan at jlab.org <gasparan at jlab.org>
> Sent: Friday, January 20, 2023 4:47 PM
> To: Bogdan Wojtsekhowski <bogdanw at jlab.org>
> Subject: Re: Fw: [PRad] [EXTERNAL] Re: X17 White Paper
>
>
>   Hi Bogdan,
>  Karl van Bibber has many articles on this matter, can you please
>  direct to which one.
>
>  Also, I went through your proposals and we may discuss it in next
>  week during the 22+ GeV conference, if you have some time for that.
>
>  Thanks,
>  Ashot
>
> > Hi Ashot,
> >
> > The search for a new particle in A-> gamma + gamma mode was discuss in
> > paper by Karl van Bibber. It may be will be a good reference.
> >
> > Bogdan
> >
> > ________________________________
> > From: PRad <prad-bounces at jlab.org> on behalf of Tyler Hague via PRad
> > <prad at jlab.org>
> > Sent: Friday, January 20, 2023 2:11 PM
> > To: prad at jlab.org <prad at jlab.org>
> > Subject: [PRad] [EXTERNAL] Re: X17 White Paper
> >
> > Hello everyone,
> >
> > As discussed today in the PRad meeting, I have finalized the edits based
> > on comments received. While we were unfortunately too late in completing
> > this to be submitted as a white paper, we have opted to upload it to the
> > arXiv so that it may be available for reference as it contains new work.
> >
> > Attached is the document, as submitted. It will be announced on the arXiv
> > on Monday. When I receive the announcement confirmation, I will send
> > everyone the identifier and the password to claim the authorship of the
> > document.
> >
> > Best,
> > Tyler
> >
> > On Fri, Jan 6, 2023 at 8:45 PM Tyler Hague
> > <tjhague at lbl.gov<mailto:tjhague at lbl.gov>> wrote:
> > Hello everyone,
> >
> > In today's meeting we discussed the X17 White Paper and said that I would
> > send it around after a final read-through. It is attached to this
> message.
> > Please take a look at it and send any comments.
> >
> > Best,
> > Tyler
> >
>
>
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