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<div class="elementToProof" style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">
Hi Beni,</div>
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<br>
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Thanks for your message. Yes, there is a limit to detect K+.</div>
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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</div>
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<br>
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<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);"><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_pdf_2005.14272.pdf&d=DwMGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=pq7ffU14TkpMRb2WAbhXTPSbIir3eCyeDBri_qbqP4Y&m=Z-_GejExCCgPQXNUIZKsV1z2sk1uytN55ueupBQqny0y_SX3sxvQpxXoYWTJ4i89&s=NfzoGsv9QsOOCs1C4OqZSPS8FQ8ihoBHLa0qVRfrgIw&e=" id="LPlnk917261">https://arxiv.org/pdf/2005.14272.pdf</a></span></div>
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<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">Then we could use incoming K_L momenta about 300 MeV/c or even 350 MeV/c.</span></div>
<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">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</span></div>
<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">and tracking will be available.</span></div>
<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">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.</span></div>
<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);"><br>
</span></div>
<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">Best regards,</span></div>
<div class="elementToProof"><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(0, 0, 0);">Moskov.</span></div>
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<div><span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(12, 100, 192);"><b> </b></span><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(12, 100, 192);">Dr. Moskov Amaryan</span></div>
<div><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(12, 100, 192);">Eminent Scholar and Professor of Physics</span><span style="font-family: "Times New Roman", Times, serif; font-size: 13px; color: rgb(0, 0, 0);"><br>
</span></div>
<div><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(12, 100, 192);">Old Dominion University</span><span style="font-family: "Times New Roman", Times, serif; font-size: 13px; color: rgb(0, 0, 0);"><br>
</span></div>
<div><span style="font-family: "Times New Roman", Times, serif; font-size: 14pt; color: rgb(12, 100, 192);">Norfolk, VA 23529</span><span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(179, 106, 226);"></span><span style="font-family: "Times New Roman", Times, serif; font-size: 13px; color: rgb(0, 0, 0);"><br>
<br>
</span><span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(12, 100, 192);">Phone: 757-683-4614</span><span style="font-family: "Times New Roman", Times, serif; font-size: 13px; color: rgb(0, 0, 0);"><br>
</span><span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: rgb(12, 100, 192);"> Fax: 757-683-3038
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Halld-klf <halld-klf-bounces@jlab.org> on behalf of Beni Zihlmann <zihlmann@jlab.org><br>
<b>Sent:</b> Monday, December 11, 2023 2:47 PM<br>
<b>To:</b> halld-klf@jlab.org <halld-klf@jlab.org><br>
<b>Subject:</b> Re: [Halld-klf] [EXTERNAL] two-body kinematics</font>
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<div>H Moskov,<br>
<br>
I did some fast crewed simulation and find that a 150MeV/ K+ will never be detected<br>
in the GlueX detector. It is simply not possible. The K+ decays even before reaching the
<br>
Start Counter.<br>
<br>
In order for a K+ to be detected and tracked it needs a momentum of about 250MeV/c<br>
at the minimum.<br>
<br>
you can find the necessary information in the attached pdf file.<br>
<br>
cheers,<br>
Beni<br>
<br>
<div class="x_moz-cite-prefix">On 12/4/23 17:49, Amaryan, Moskov wrote:<br>
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Dear all,</div>
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<br>
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As we discussed today, as an example, please find in the attachment</div>
<div class="x_elementToProof" style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(0,0,0)">
double plot for the kinematics of K_L+p \to K^+n for 200 MeV/c </div>
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of incoming K_L momentum. As one can see, very forward angles</div>
<div class="x_elementToProof" style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(0,0,0)">
constitute a small fraction of the entire angular range of produced K^+.</div>
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<br>
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Best regards,</div>
<div class="x_elementToProof" style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(0,0,0)">
Moskov.</div>
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<br>
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<div style="background-color:rgb(255,255,255)"><span style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(0,0,0)"><br>
</span></div>
<div><span style="font-family:"Times New Roman",Times,serif; font-size:12pt; color:rgb(12,100,192)"><b> </b></span><span style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(12,100,192)">Dr. Moskov Amaryan</span></div>
<div><span style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(12,100,192)">Eminent Scholar and Professor of Physics</span><span style="font-family:"Times New Roman",Times,serif; font-size:13px; color:rgb(0,0,0)"><br>
</span></div>
<div><span style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(12,100,192)">Old Dominion University</span><span style="font-family:"Times New Roman",Times,serif; font-size:13px; color:rgb(0,0,0)"><br>
</span></div>
<div><span style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(12,100,192)">Norfolk, VA 23529</span><span style="font-family:"Times New Roman",Times,serif; font-size:12pt; color:rgb(179,106,226)"></span><span style="font-family:"Times New Roman",Times,serif; font-size:13px; color:rgb(0,0,0)"><br>
<br>
</span><span style="font-family:"Times New Roman",Times,serif; font-size:12pt; color:rgb(12,100,192)">Phone: 757-683-4614</span><span style="font-family:"Times New Roman",Times,serif; font-size:13px; color:rgb(0,0,0)"><br>
</span><span style="font-family:"Times New Roman",Times,serif; font-size:12pt; color:rgb(12,100,192)"> Fax: 757-683-3038
</span><span style="font-family:"Times New Roman",Times,serif; font-size:13px; color:rgb(0,0,0)"></span></div>
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