[Halld-klf] [EXTERNAL] two-body kinematics

[Amaryan, Moskov]

Hi Beni,

Thanks for your message. Yes, there is a limit to detect K+.
If we take 250 MeV/c  for the minimum momenta of K+ to be detected, as can be seen also from the Fig. 28 and Fig.29 of the GlueX paper

https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_pdf_2005.14272.pdf&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=pq7ffU14TkpMRb2WAbhXTPSbIir3eCyeDBri_qbqP4Y&m=Z-_GejExCCgPQXNUIZKsV1z2sk1uytN55ueupBQqny0y_SX3sxvQpxXoYWTJ4i89&s=NfzoGsv9QsOOCs1C4OqZSPS8FQ8ihoBHLa0qVRfrgIw&e= 

Then we could use incoming K_L momenta about 300 MeV/c or even 350 MeV/c.
Then the minimum W will be 1.488 GeV (for P(K_L) =300 MeV/c or 1.505 GeV (for P(K_L) =350 MeV/c). That means that the range of W covered by KLF experiment will be above 1.505 GeV, which is fine. The more detailed simulations will show efficiency of detection of K+ particles, but it is already quite optimistic as both dE/dx as well as TOF would work
and tracking will be available.
Bear in mind that in this experiment we are not concerned about invariant mass resolution of K+n system, but rather measuring W for the final state K+n , which at these momenta will have a resolution on the order 1-2 MeV.

Best regards,
Moskov.

 Dr. Moskov Amaryan
Eminent Scholar and Professor of Physics
Old Dominion University
Norfolk, VA 23529​

Phone: 757-683-4614
    Fax: 757-683-3038
________________________________
From: Halld-klf <halld-klf-bounces at jlab.org> on behalf of Beni Zihlmann <zihlmann at jlab.org>
Sent: Monday, December 11, 2023 2:47 PM
To: halld-klf at jlab.org <halld-klf at jlab.org>
Subject: Re: [Halld-klf] [EXTERNAL] two-body kinematics


EXTERNAL to ODU: This email is not from an ODU account. Do not click links or open attachments unless you recognize the sender and know the content is safe.

H Moskov,

I did some fast crewed simulation and find that a 150MeV/ K+ will never be detected
in the GlueX detector. It is simply not possible. The K+ decays even before reaching the
Start Counter.

In order for a K+ to be detected and tracked it needs a momentum of about 250MeV/c
at the minimum.

you can find the necessary information in the attached pdf file.

cheers,
Beni

On 12/4/23 17:49, Amaryan, Moskov wrote:
Dear all,

As we discussed today, as an example, please find in the attachment
double plot for the kinematics of K_L+p \to K^+n for 200 MeV/c
of incoming K_L momentum. As one can see, very forward angles
constitute a small fraction of the entire angular range of produced K^+.

Best regards,
Moskov.


 Dr. Moskov Amaryan
Eminent Scholar and Professor of Physics
Old Dominion University
Norfolk, VA 23529​

Phone: 757-683-4614
    Fax: 757-683-3038



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