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<div class="">Can you show a plot of just the invariant mass @ z ~0mm (pick a mass) in a similar format Omar showed today? I don’t see how these plots address what we are worried about (radiative tails in the invariant mass). </div>
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<div class="">On Jun 26, 2018, at 4:06 PM, Solt, Matthew Reagan <<a href="mailto:mrsolt@slac.stanford.edu" class="">mrsolt@slac.stanford.edu</a>> wrote:</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Thanks for looking into this Sho.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">I think bottom line, I just apply the truth x cut for the efficiency curves. I don't think this is cheating since we care about the truth for these.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Nan (a rotation student), did a quick and dirty study similar to this. He cut on the residual of both electron and positron momentum, decay z, and mass at 3 sigma for all these. Then he took the ratio
between the efficiency curves (as a function of z) of those curves and the curves without those cuts. Results are below (ratio vs z for several A' masses). I originally was curious in the affect of the recoil electron in the reconstruction (those cuts should
get rid of most of them), not the radiative tail as discussed this morning. The results are what I expected, a very large affect for low mass (which always has a large tail in mass), and a slightly larger affect neat the target where reconstructing with the
recoil electron is more likely. In our mass and z region of interest (~>30 mm and mass > 35 MeV), it seems like a 5-10% effect.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class=""><span id="cid:572ab039-93d9-433d-ab75-634925e2a259"><pastedImage.png></span><span class="Apple-converted-space"> </span>at<span class="Apple-converted-space"> </span><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Same plot but with error bars</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">More details are here if you want to see some of the tails he cut out: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_nanw0321_HPS_tree_master_Plots_vertex-5Fcut&d=DwMGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=jUMosVsECpbuEahfoTOoLu_TzxRGB0wTRCrR6FYFUpA&s=ScIGqVD757qZ43t-TvjluH_aGZ2Vku-LXNpVDU9APUs&e=" class="OWAAutoLink" id="LPlnk58489" previewremoved="true">https://github.com/nanw0321/HPS/tree/master/Plots/vertex_cut</a></div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Matt Solt<br class="">
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<font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Hps-analysis <<a href="mailto:hps-analysis-bounces@jlab.org" class="">hps-analysis-bounces@jlab.org</a>> on behalf of Sho Uemura
<<a href="mailto:meeg@slac.stanford.edu" class="">meeg@slac.stanford.edu</a>><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Tuesday, June 26, 2018 1:44:52 PM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span>Graham, Mathew Thomas<br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:hps-analysis@jlab.org" class="">hps-analysis@jlab.org</a><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [Hps-analysis] HPS Analysis Meeting June 26 @ 10am/1pm PDT/EDT</font>
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<div class="PlainText">I read the note, it looks good so far. I've made a couple of typo fixes<span class="Apple-converted-space"> </span><br class="">
and I'll put more substantive comments in a text file (in the Dropbox,<span class="Apple-converted-space"> </span><br class="">
comments_sho/comments.txt), but the only things I have there right now are<span class="Apple-converted-space"> </span><br class="">
things I screwed up in my thesis.<br class="">
<br class="">
I looked at the low-mass tail (pyroot macro and plots attached). See the<span class="Apple-converted-space"> </span><br class="">
comments in the macro for detail, but summary: I'd misremembered what the<span class="Apple-converted-space"> </span><br class="">
cut is that cleans it up: it's not the radiative cut on the recon vertex,<span class="Apple-converted-space"> </span><br class="">
it's a x>0.8 cut on the truth A'. So, that's obviously cheating (in my<span class="Apple-converted-space"> </span><br class="">
thesis I say I'm doing it, but completely sweep it under the rug). But the<span class="Apple-converted-space"> </span><br class="">
tail I saw (might not be the same tail you see) is definitely recoil e-<span class="Apple-converted-space"> </span><br class="">
misidentification in low-X A' events.<br class="">
<br class="">
On Tue, 26 Jun 2018, Graham, Mathew Thomas wrote:<br class="">
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><br class="">
> Hi All,<br class="">
><br class="">
> We?ll meet tomorrow for an update on things in the run-up to ICHEP. We?ve got both the 2015 bump-hunt and vertexing analysis aiming for it and this Wednesday is the nominal deadline for presenting the results to the collaboration.<br class="">
><br class="">
><span class="Apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_display_hpsg_June-2B26-252C-2B2018-2BDAWG-2BMeeting&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=tfApseM4CjHLmQsSyzN2_qiQXCcyyhPiyBz4KuhbuJs&e=" class="">https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_display_hpsg_June-2B26-252C-2B2018-2BDAWG-2BMeeting&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=tfApseM4CjHLmQsSyzN2_qiQXCcyyhPiyBz4KuhbuJs&e=</a><<a href="" class=""></a><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_display_hpsg_June-2B26-2C-2B2018-2BDAWG-2BMeeting&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=0pcsXe14RWQBSJw6vopXDE59LApRfHspxGQ9MmL_W5o&e=" class="">https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_display_hpsg_June-2B26-2C-2B2018-2BDAWG-2BMeeting&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=0pcsXe14RWQBSJw6vopXDE59LApRfHspxGQ9MmL_W5o&e=</a>
><br class="">
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> Thanks, Matt & Nathan<br class="">
><br class="">
><br class="">
> * Browser:<span class="Apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_722990411&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=zv9zYKaJUIsEnSy69p9nhR411Ne36jaUOe7bumSNm8k&e=" class="">https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_722990411&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=zv9zYKaJUIsEnSy69p9nhR411Ne36jaUOe7bumSNm8k&e=</a><br class="">
> * Phone: 8882402560 722990411 ## *4<br class="">
> * Details: <span class="Apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_display_hpsg_DAWG-2BMeetings&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=k9XGeUQtlLm2joswzEwU0A6I-8sNf26yGFyjfTUwUpo&e=" class="">https://urldefense.proofpoint.com/v2/url?u=https-3A__confluence.slac.stanford.edu_display_hpsg_DAWG-2BMeetings&d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=J4PP6Zl8IyGHpsqWaKegORCYw8hoCHePTw5O95a5lqQ&m=k4vmYUNmn_n-5PP-EHertr6XxvPSqcKO5XvWw2_iXGE&s=k9XGeUQtlLm2joswzEwU0A6I-8sNf26yGFyjfTUwUpo&e=</a><br class="">
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