[BDXlist] [EXTERNAL] BDX: PAC51 jeopardy presentation

[Andrea Celentano]

Hi,
3x is before 2025.
After 2028, we can probably reach x10.

Ciao,
Andrea

> On Jul 19, 2023, at 09:19, Marco Battaglieri <battaglieri at ge.infn.it> wrote:
> 
> Hi Andrea,
> thanks for the info. 
> 3x better stat is after the 2028 run? 2030 could be a reasonable guess to have 3x better upper limits?
> Anyway it does not seem to question the BDX reach if we'll be able to deliver x100 wrt E137/old-NA64 limits
> Cheers
> marco
> 
> Andrea Celentano wrote:
>> Hi Marco,
>> thanks.
>> 
>> NA64 plans to accumulate ~3E12 before 2025 (3x what we have now), then measurements will start again in 2028, after CERN Long Shutdown.
>> 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.
>> 
>> Cheers,
>> Andrea
>> 
>>> On Jul 18, 2023, at 18:46, Marco Battaglieri <battaglieri at ge.infn.it> <mailto:battaglieri at ge.infn.it> wrote:
>>> 
>>> Hi Andrea,
>>> thanks for your comments: I'll implement them in the new version of the slides.
>>> Below some more detailed answers.
>>> 
>>> Andrea Celentano wrote:
>>>> Dear Marco,
>>>> the slides are to me very clear. Here are my comments.
>>>> 
>>>> Slide n. 6, in top-left figure the words are mirrored?
>>> it was ment to show the dierction of the beam from right to left (see the aereal picture of the acc site).
>>>> Slide n. 8, we only considered positrons resonant annihilation.
>>> corrected
>>>> 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 (https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2307.02404&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ru7nA6zPBSFajtw1o6aZjchIV9Cs2SBk2RiVldzQhDc&m=HTUoqjp6LmAimg_8KiRx2dcBwwOIfjBwI-pLg2p3yNf-V5UFWDtVhIxscEP4ZT2V&s=qGfNmfAXWRcl4XZmUvf803JHA69xdwvtJTLDZRvfyI4&e= ).
>>>> 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: https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2108.04195&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ru7nA6zPBSFajtw1o6aZjchIV9Cs2SBk2RiVldzQhDc&m=HTUoqjp6LmAimg_8KiRx2dcBwwOIfjBwI-pLg2p3yNf-V5UFWDtVhIxscEP4ZT2V&s=KtroJdnHtXJIH-rMk_Qky2jBdVdNf5Ar4LBL6cfI0D0&e= , 2 years ago)
>>> 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!~
>>> What are the NA64 plans for the near future (say within 2028?)
>>> Cheers
>>> Marco
>>>> 
>>>> 
>>>> Bests,
>>>> Andrea
>>>> 
>>>> 
>>>> 
>>>> <PastedGraphic-1.png>
>>>> 
>>>>> On Jul 16, 2023, at 23:44, Marco Battaglieri via BDXlist <bdxlist at jlab.org> <mailto:bdxlist at jlab.org> wrote:
>>>>> 
>>>>> Dear BDXers,
>>>>> here in attachment the draft of PAC presentation.
>>>>> Please send me your comments/suggestions by Tuesday night EDT (in particular language corrections).
>>>>> I'd propose to have a dry run on Wednesday July  19 at 10:00AM EDT via the usual zoom link
>>>>> https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1602402962-3Fpwd-3DSGtYZTFyOVgrbEUxdHN3Z1N1SVYrUT09&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=Ru7nA6zPBSFajtw1o6aZjchIV9Cs2SBk2RiVldzQhDc&m=HTUoqjp6LmAimg_8KiRx2dcBwwOIfjBwI-pLg2p3yNf-V5UFWDtVhIxscEP4ZT2V&s=PS6WyyEuRm2qk5eILZL77y_83U72SsFIOrXRBRmMJsc&e=  <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=>
>>>>> Talk to you in a while 
>>>>> cheers
>>>>> Marco
>>>>> 
>>>>> <bdx-PAC51-battaglieri.pdf>_______________________________________________
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>>>> 
>>> 
>> 
> 

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