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hi Beni,</div>
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<br>
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Thanks for your message.</div>
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Yes, all the questions you raised need to be answered. One way of doing it would be to use</div>
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existing GlueX data and see what happens to the K+ particles depending on their momenta.</div>
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Would they have enough momenta after penetrating the target and start counter, would they have</div>
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enough energy to deposit sufficient energy in CDC to produce a track and so on.</div>
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My student, Tyler Viducic is doing analysis of the K_sK^+\pi^-p final state data and we already looked</div>
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at momenta of K+ particles which are minimum at 70 MeV/c or so, but it has to be studied further to see</div>
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if we had a single track, how well could we reconstruct K+n final state. The advantage of KLF experiment,</div>
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among other things, is the fact that we are going to look not at the invariant mass of K+n, but on W, </div>
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the resolution of which is on the order 1-2 MeV at low momenta below 500 MeV/c.</div>
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<br>
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I think we could answer those questions both from data and MC simulations.</div>
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<br>
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The main purpose of the plot I sent out, was to convey a message that in the two-body reaction, the very</div>
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forward angles, below say 20 deg, are very small fraction (less than 1%) of the entire phase-space.</div>
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<br>
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Best regards,</div>
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Moskov.</div>
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<br>
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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> Tuesday, December 5, 2023 12:33 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>Hi Moskov,<br>
<br>
my response to this is the following:<br>
lets take a K+ at 150MeV/c going out at close to 60 degree.<br>
This K+ my need to pass through a substantial amount of liquid hydrogen<br>
depending on where it is generated in the target. This can be between zero<br>
and 7cm. After that it has to pass tough the target cell the scattering chamber<br>
and then through the start counter in order to get to the CDC and produce a track.<br>
<br>
so <br>
a) what is the likelihood that a 150MeV/c K+ makes it to the Start counter?<br>
b) how much energy is deposited in the start counter?<br>
c) what is the likelihood that this K+ will generate enough hits in the CDC to reconstruct a track?<br>
d) There will be only 1 track at best, how can this event be reconstructed with this limited<br>
since the vertex is not very well defined?<br>
<br>
cheers,<br>
Beni<br>
<br>
<br>
<div class="x_moz-cite-prefix">On 12/4/23 17:49, Amaryan, Moskov wrote:<br>
</div>
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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>
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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>
<div class="x_elementToProof" style="font-family:"Times New Roman",Times,serif; font-size:14pt; color:rgb(0,0,0)">
<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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