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Hi Andrea,<br>
thanks for the info. <br>
3x better stat is after the 2028 run? 2030 could be a reasonable
guess to have 3x better upper limits?<br>
Anyway it does not seem to question the BDX reach if we'll be able
to deliver x100 wrt E137/old-NA64 limits<br>
Cheers<br>
marco<br>
<br>
<div class="moz-cite-prefix">Andrea Celentano wrote:<br>
</div>
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cite="mid:2FDA1D71-753E-4B99-B0C0-3802A4BB39E3@ge.infn.it">
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Hi Marco,
<div>thanks.</div>
<div><br>
</div>
<div>
<div>NA64 plans to accumulate ~3E12 before 2025 (3x what we have
now), then measurements will start again in 2028, after CERN
Long Shutdown.</div>
<div>The expected upper limit will be ~ 3x better than what we
reported on the arXiv. In parallel to this, we plan a
dedicated positron-beam program with multiple beam energies to
“scan” the A’ mass region above 140 MeV.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Andrea</div>
<div>
<div><br>
<blockquote type="cite">
<div>On Jul 18, 2023, at 18:46, Marco Battaglieri
<a class="moz-txt-link-rfc2396E" href="mailto:battaglieri@ge.infn.it"><battaglieri@ge.infn.it></a> wrote:</div>
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<div text="#000000" bgcolor="#FFFFFF"> Hi Andrea,<br>
thanks for your comments: I'll implement them in the
new version of the slides.<br>
Below some more detailed answers.<br>
<br>
<div class="moz-cite-prefix">Andrea Celentano wrote:<br>
</div>
<blockquote type="cite"
cite="mid:84469FAF-E0B6-43EE-8CF5-ED36AEF1C47B@ge.infn.it">
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Dear Marco,
<div>the slides are to me very clear. Here are my
comments.
<div><br>
</div>
<div>
<ul class="MailOutline">
<li>Slide n. 6, in top-left figure the words
are mirrored?</li>
</ul>
</div>
</div>
</blockquote>
it was ment to show the dierction of the beam from
right to left (see the aereal picture of the acc
site).<br>
<blockquote type="cite"
cite="mid:84469FAF-E0B6-43EE-8CF5-ED36AEF1C47B@ge.infn.it">
<div>
<div>
<ul class="MailOutline">
<li>Slide n. 8, we only considered positrons
resonant annihilation.</li>
</ul>
</div>
</div>
</blockquote>
corrected<br>
<blockquote type="cite"
cite="mid:84469FAF-E0B6-43EE-8CF5-ED36AEF1C47B@ge.infn.it">
<div>
<div>
<ul class="MailOutline">
<li>Slide n. 11, the sentence “World exclusion
limits are mainly the same as 5y ago” is to
me not appropriate. The NA64 experiment just
completed a run with ~ 1E12 EOT, and the new
limits are definitively stronger than those
reported in the slide (<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2307.02404&d=DwMDaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ru7nA6zPBSFajtw1o6aZjchIV9Cs2SBk2RiVldzQhDc&m=xy6QJhlR0eTU2hYwp1yORNiUqbho0DrxpUMZ6jBMUWQs2_2ESRvGHBDWY3Go_gdL&s=ZbAxRq-jqJ30vrVtDlD1uf8BPPest-9gRECefQ68G2U&e=" moz-do-not-send="true">https://arxiv.org/abs/2307.02404</a>).</li>
<ul class="MailOutline">
<li>These results for the moment are only on
arXiv (PRL paper was submitted one week
ago), so we can probably not mention them.
However, I would remove this sentence
(note that the latest published NA64
results are from 2021 PRD letter: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2108.04195&d=DwMDaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ru7nA6zPBSFajtw1o6aZjchIV9Cs2SBk2RiVldzQhDc&m=xy6QJhlR0eTU2hYwp1yORNiUqbho0DrxpUMZ6jBMUWQs2_2ESRvGHBDWY3Go_gdL&s=L4dd_6jR3GtZf42jOcIS4FlJ1vnd9NcbUk2gccHRsbo&e=" moz-do-not-send="true">https://arxiv.org/abs/2108.04195</a>,
2 years ago)</li>
</ul>
</ul>
</div>
</div>
</blockquote>
I was not aware of the new NA64 publication: good job!
I will certainly soften the message prizing the recent
result. This cen be a good stimulus to let BDX run
asap!~<br>
What are the NA64 plans for the near future (say
within 2028?)<br>
Cheers<br>
Marco<br>
<blockquote type="cite"
cite="mid:84469FAF-E0B6-43EE-8CF5-ED36AEF1C47B@ge.infn.it">
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<div>
<div><br>
</div>
<div><br>
</div>
<div>Bests,</div>
<div>Andrea</div>
<div><br>
</div>
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<blockquote type="cite">
<div>On Jul 16, 2023, at 23:44, Marco
Battaglieri via BDXlist <a
class="moz-txt-link-rfc2396E"
href="mailto:bdxlist@jlab.org"
moz-do-not-send="true"><bdxlist@jlab.org></a>
wrote:</div>
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Dear BDXers,<br>
here in attachment the draft of PAC
presentation.<br>
Please send me your comments/suggestions
by Tuesday night EDT (in particular
language corrections).<br>
I'd propose to have a dry run on<b>
Wednesday July 19 at 10:00AM EDT</b>
via the usual zoom link<br>
<a class="moz-txt-link-freetext"
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1602402962-3Fpwd-3DSGtYZTFyOVgrbEUxdHN3Z1N1SVYrUT09&d=DwMDaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ru7nA6zPBSFajtw1o6aZjchIV9Cs2SBk2RiVldzQhDc&m=Untk_MoS_Ckbj4ZSYI2GzxXU8Ab3OaUrt_S2ZuUNiRj1_T4bcytRPfYuv7XLZexl&s=LySB7xHdaej-aC3wG7xmQMUrM4FPcXdab-09qq4azfw&e="
moz-do-not-send="true">https://jlab-org.zoomgov.com/j/1602402962?pwd=SGtYZTFyOVgrbEUxdHN3Z1N1SVYrUT09</a><br>
Talk to you in a while <br>
cheers<br>
Marco<br>
<br>
</div>
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