<div dir="ltr">Hi Jackson,<div>The analysis note is very detailed and clear. I also think it is essentially ready for unblinding.</div><div>I just have a couple of questions which you can quickly answer during our meeting today. </div><div><br></div><div>1. Could you briefly describe how the detection efficiency epsilon_a (Fig 31 right panel) and epsilon_eta were determined? I guess the ratio of these efficiencies is the primary factor determining the shape of Fig 32.</div><div><br></div><div>2. Please check if the narrow sharp feature at the very right edge of the dark bands in Fig 36 and 37 are real.</div><div><br></div><div>I also second Axel's concern about downstream etas, and the suggested quick test.</div><div><br></div><div>Cheers</div><div>Dipangkar</div><div><br><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><br></div></div></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Dec 11, 2022 at 10:20 PM Axel Schmidt via halld_src <<a href="mailto:halld_src@jlab.org">halld_src@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">Dear all,<div><span style="white-space:pre-wrap"> </span>Thank you Jackson, for putting this incredibly detailed and well-written note together. I've finished going through it. Basically I have two concerns before we unblind. I hope you can address them easily. Let's discuss in tomorrow's meeting. </div><div><br></div><div><br></div><div>1) etas produced downstream</div><div><br></div><div><span style="white-space:pre-wrap"> </span>My biggest fear is that we'll "discover" an ALP that is actually the peak from etas produced on some downstream material. Can you convince me that this cannot happen? I don't know the best way to study it but some ideas are:</div><div><span style="white-space:pre-wrap"> </span>- Figure out the total thickness of any foils or windows after the target ladder and where they occur. (I don't care about air, since it will not make a bump) </div><div><span style="white-space:pre-wrap"> </span>- Simulate a fake signal with an eta mass, but a displaced vertex. </div><div><br></div><div><span style="white-space:pre-wrap"> </span>Eventually this effect must limit our sensitivity to ALPs. I would be very satisfied if you could show where this limit ought to be, especially if it's 4 orders of magnitude from our expected sensitivity.</div><div><br></div><div><br></div><div><br></div><div>2) Effective # of searches</div><div><br></div><div><span style="white-space:pre-wrap"> </span>My second concern is about your data-driven method of using up-crossings to estimate the effective number of independent searches. If I understand things correctly, the effective number of search regions should really only be a function of your resolution. Maybe the shape of the smooth background comes in as a second order effect, but really it's an effect of the width of any bumps you might find. </div><div><br></div><div><span style="white-space:pre-wrap"> </span>However, for any given random data set, the precise number of up crossings might fluctuate due to statistics. With 10% of the data, we see 3 up-crossings. When we unblind we expect to still see 3, plus or minus one. My question to you is: what should we do if we see many many more?</div><div><br></div><div><span style="white-space:pre-wrap"> </span>In some sense, we could study this by looking at only 1% of the data. Or in simulation. But I don't want to waste time on this. I just would like to hear your thoughts. Is there anyway to do a sanity check on the full data set before we look for bumps? Would our seeing 27 up crossings invalidate a discovery?</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div>If you can give answers to these concerns, I would feel comfortable unblinding. </div><div>Looking forward to discussing tomorrow,</div><div>Axel</div><div><br></div><div><br><div>
<div>________________</div>
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<div><br></div><div>Typos to fix whenever you are bored in the next few months:</div><div><br></div><div><div>Line 89</div><div><span style="white-space:pre-wrap"> </span>! GeV</div><div><br></div><div>Line 106</div><div><span style="white-space:pre-wrap"> </span>Three criteria vs four criteria</div><div><br></div><div>Line 192</div><div><span style="white-space:pre-wrap"> </span>a -> an</div><div><br></div><div>________________</div></div><div><br><blockquote type="cite"><div>On Dec 5, 2022, at 15:00 , Jackson Reeves Pybus via halld_src <<a href="mailto:halld_src@jlab.org" target="_blank">halld_src@jlab.org</a>> wrote:</div><br><div><div style="overflow-wrap: break-word;">Hello all,<br><br>As discussed in today’s SRC-CT analysis meeting, I am now distributing our internal analysis note for the ongoing Axion-Like Particle search using our Carbon data. As we hope to unblind the data from our current 10% soon to examine our full statistics, we would ask that anyone with interest in the analysis read over the note and provide comments in the following week, before next SRC-CT meeting. Comments relevant to the decision to unblind are the priority at this time. Next week, an overall description of the analysis will be presented to the group.<br><br>Any comments should be added to the following Google Doc, which will be addressed Monday:<br><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_document_d_1LxsqEbn4JKX9AqlFElJ59TWd-2DN09to4w6Xj833Tv3cA_edit-3Fusp-3Dsharing&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=66Sb4pp0d4diwFuNQ_jTiKyZDsB_FG2X3Hlmk9_wuSY&m=N1TqBAlSCOi_HY3Ublw9Syo_-QbsiFIAlZoRAatnsA4yBIYMpkVO0TZaxmOD3aSv&s=C7WSuOX1eWH7BEYtQQMxCLtqL0Se2-6SaxEXuL1_b-0&e=" target="_blank">https://docs.google.com/document/d/1LxsqEbn4JKX9AqlFElJ59TWd-N09to4w6Xj833Tv3cA/edit?usp=sharing</a><br><br>Thank you,<br>Jackson<br><br></div><span id="m_-7073680684326048769cid:79F7B18C-66EF-4EF0-9228-A1B29F50C010@mynetworksettings.com"><SRC_CT_Analysis_Note_for_ALP_Search.pdf></span><div style="overflow-wrap: break-word;"></div>_______________________________________________<br>halld_src mailing list<br><a href="mailto:halld_src@jlab.org" target="_blank">halld_src@jlab.org</a><br><a href="https://mailman.jlab.org/mailman/listinfo/halld_src" target="_blank">https://mailman.jlab.org/mailman/listinfo/halld_src</a><br></div></blockquote></div><br></div></div>_______________________________________________<br>
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