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Dear Colleague,<br>
<br>
Jefferson Lab is internationally recognized for its comprehensive<br>
scientific program in hadron physics, enabled by the up-to-12 GeV<br>
electron beam from CEBAF and primarily conducted through fixed-target<br>
experiments. The interaction of the high-intensity electron beam with<br>
the beam dump produces intense secondary beams of muons, neutrinos,<br>
neutrons, and potentially even hypothetical dark matter particles. The<br>
potential for producing a light dark matter beam is currently being<br>
explored by the PAC-approved Beam Dump eXperiment (BDX). The underground<br>
facility planned for BDX could also accommodate additional<br>
instrumentation to enable new experiments utilizing these secondary beams.<br>
<br>
To explore these exciting possibilities, we are organizing a two-day<br>
hybrid workshop (in person and on Zoom) titled "BDX and Beyond",<br>
scheduled for September 4–5, 2025, at Jefferson Lab. The workshop aims<br>
to optimize the use of secondary beams at JLab and will culminate in the<br>
preparation of a White Paper summarizing its findings and recommendations.<br>
The scientific program is structured around the following tracks:<br>
<br>
1. Muon physics<br>
2. Neutrino physics<br>
3. Dark matter and dark sector<br>
4. Instrumentation and targets<br>
5. Other topics (including beam dump and beam lines)<br>
<br>
Detailed information about the secondary beam characteristics can be<br>
found on the workshop indico page<br>
<a href="https://indico.jlab.org/event/951/page/493-secondary-beam-information" target="_blank" id="OWA89963a08-3bf5-612c-aa5a-7fef2d9c77cb" class="OWAAutoLink" title="https://indico.jlab.org/event/951/page/493-secondary-beam-information" rel="noopener noreferrer" data-auth="NotApplicable" style="margin: 0px; text-align: left;">https://indico.jlab.org/event/951/page/493-secondary-beam-information</a><br>
and in the recent publication: M. Battaglieri et al., Secondary Beams at<br>
High-Intensity Electron Accelerator Facilities, Instruments 8, 1 (2024),<br>
<a href="https://doi.org/10.3390/instruments8010001" target="_blank" id="OWA70213098-c0ee-42c2-d1f8-bf0a27947787" class="OWAAutoLink" title="https://doi.org/10.3390/instruments8010001" rel="noopener noreferrer" data-auth="NotApplicable" style="margin: 0px; text-align: left;">https://doi.org/10.3390/instruments8010001</a>.<br>
<br>
This workshop will serve as a forum for presenting cross-cutting ideas<br>
relevant to the secondary beam experimental environment at JLab and for<br>
engaging in fruitful discussions with experts from the muon, neutrino,<br>
dark matter, and accelerator physics communities.<br>
<br>
Invited speakers include:<br>
<br>
Andrei Afanasev (GWU)<br>
Dinawita Banerjee (CERN)<br>
Ethan Cline (StonyBrookU)<br>
Luca Doria (MainzU)<br>
Claudio Montanari (INFN)<br>
Vishvas Pandey (FNAL)<br>
Ryan Plestid (CalTech)<br>
Riccardo Rossini (PaviaU)<br>
Davide Terzani (LBL)<br>
<br>
We would be glad to accept oral contributions of 15+5 mn via the web<br>
interface (<a href="https://indico.jlab.org/event/951/abstracts/" target="_blank" id="OWA2f454e79-a509-3685-d0cf-ca045ca0c493" class="OWAAutoLink" title="https://indico.jlab.org/event/951/abstracts/" rel="noopener noreferrer" data-auth="NotApplicable" style="margin: 0px; text-align: left;">https://indico.jlab.org/event/951/abstracts/</a>)<br>
<br>
We kindly ask all the speakers to submit a short (1–2 page) extended<br>
abstract before the workshop. A LaTex template is provided at the Indico<br>
page <a href="https://indico.jlab.org/event/951/page/499-extended-abstracts" target="_blank" id="OWAe0317412-7a29-62d1-f24b-9bfb7b4c2782" class="OWAAutoLink" title="https://indico.jlab.org/event/951/page/499-extended-abstracts" rel="noopener noreferrer" data-auth="NotApplicable" style="margin: 0px; text-align: left;">
https://indico.jlab.org/event/951/page/499-extended-abstracts</a>.<br>
Speaker contributions and the outcome of the discussion at the workshop<br>
will be collected in a White Paper that will be made publicly available<br>
on ArXiv after review by the participants.<br>
<br>
We look forward to seeing you at Jefferson Lab this September!<br>
<br>
Patrick Achenbach<br>
Adi Ashkanazi<br>
Marco Battaglieri<br>
Jay Benesch<br>
Mariangela Bondi<br>
Eric Christy<br>
Simona Giovannella<br>
Thia Keppel<br>
Michael Kohl<br>
Camillo Mariani<br>
Kevin McFarland<br>
Jianwei Qiu<br>
Adrian Signer<br>
(BDX&Beyond Scientific Program Committee )</div>
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