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Hello everyone,</div>
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Today in the meeting we briefly touched on what we should ask Cheuk-Yin Wong about regarding the qedmeson hypothesis. In the discussion I outlined a few open questions that I have. Before we email, I need to read their other work on the subject to see if the
questions are answered there. The paper that we are referencing at this moment is <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2201.09764&d=DwMFAw&c=CJqEzB1piLOyyvZjb8YUQw&r=V3XNY-MaMKN2LuAaTdObrA&m=HY1K2MXBTbkUuhSczQsl3gFH6mymFXEkId7yZP29DEWRoKjelb4qbjA8Kf02Byxj&s=OjbgBWJYC7fo7Jk0pgNl3YcWIcTw_wVODrY-Rgw11z4&e=" id="LPNoLPOWALinkPreview">https://arxiv.org/abs/2201.09764</a></div>
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The current questions are:</div>
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<li>What is the cross-section/production rate of such a particle? This might be covered in another paper (the author has several on this topic that I have not made time to read yet)</li><li style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
What is the production mechanism? Such a particle is a two-quark bound state. Bremsstrahlung would not outright produce this like the "dark photon" model. Perhaps a Bremsstrahlung virtual photon could convert to a quark-antiquark, but I imagine that heavily
suppress the production, as that adds another "step" before the final state that we would detect.</li><li style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Could we reasonably expect to see it, if it exists, in our setup? This plays into the previous question. If we are unlikely to see it with this method, perhaps it's not worth sacrificing e+e- resolution.</li><li style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
What is the metric for testing this hypothesis? For discovery, we would need 5sigma above background. Uncertainty applied to a "non-discovery" result is perhaps trickier. In the dark photon case, we have our parameter space of mass vs. coupling constant. A
qedmeson is comprised of SM particles, so the couplings are known. Presumably, the answer is simply having some prediction of signal strength and then not seeing it at ~5sigma deviation is then the non-discovery result. Perhaps there is some other way to approach
this from the viewpoint of a person who frequently works on this theory.<br>
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<div>I will begin more reading on this next week and possibly address some of these questions as well as come up with any more questions. Please jump in here if you have any questions or comments as well!</div>
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<div>Best,</div>
<div>Tyler</div>
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