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<span style="font-family: Arial, sans-serif; font-size: 16pt; color: black;"><b>Final Announcement</b></span></div>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 16pt; color: black;"><b>International Workshop on Low Energy e<sup>±</sup> Physics at Jefferson Lab (LEEPP@JLab)</b></span></p>
<p style="background-color: white; margin: 1em 0in 12pt;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">The longtime interest for positron beams at Jefferson Lab (JLab) forms the basis for an upgrade initiative known as “Ce<sup>+</sup>BAF
12 GeV”. It will feature high duty factor beams with intensities up to 1 µA within a high duty factor. The positrons for these beams will be produced in the bremsstrahlung shower generated by a lower energy 1 mA electron beam impinging on a high-Z target,
utilizing the PEPPo (Polarized Electrons for Polarized Positrons) technique for producing highly spin-polarized positrons in a compact accelerator footprint.</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"> This methodology opens up the possibility of also producing lower energy positron beams with high intensity
and spin polarization. Beams generated from this source would enable unique experimental programs at JLab with the perspective to reveal details of the electromagnetic interaction, unravel the structure of nucleons and nuclei, and investigate the existence
of physics beyond the standard model.</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"> The success of Ce<sup>+</sup>BAF 12 GeV relies on the development of crucial R&D for generating the required
electron and positron beams. Consequently, new capabilities should emerge in the mean time, with opportunities for low-energy (sub-GeV) Nuclear Physics, Atomic Physics and Materials Science. Notably, this R&D aims at intense beams both for generation of polarized
electrons at mA intensity and linac based positron beams that have the potential to exceed present capabilities by orders of magnitude. Altogether, output of this effort has a great potential to facilitate a venue for low energy e+/e- physics.</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"> The LEEPP@JLab International Workshop aims to explore new pathways for Science with both unpolarized/polarized
electron and positron beams. Beam energies ranging from 1-100 MeV for both species as well as moderated/slow positrons to several eV are within the scope of this workshop.
<b><i>LEEPP@JLab will be held at Jefferson Lab, March 23rd-27th, 2026.</i></b></span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">The workshop will include invited talks and selected contributions on the following topics:</span></p>
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<span style="font-family: Symbol; font-size: 10pt; color: black;">·</span><span style="font-family: "Times New Roman"; font-size: 7pt; color: black; line-height: normal;">
</span><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Positron sources, related equipment and diagnostics </span></p>
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<span style="font-family: Symbol; font-size: 10pt; color: black;">·</span><span style="font-family: "Times New Roman"; font-size: 7pt; color: black; line-height: normal;">
</span><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Nuclear Physics </span></p>
<p style="text-indent: 0in; background-color: white; margin: 0in 0in 0.0001pt 0.5in; font-family: Calibri, sans-serif; font-size: 11pt;">
<span style="font-family: Symbol; font-size: 10pt; color: black;">·</span><span style="font-family: "Times New Roman"; font-size: 7pt; color: black; line-height: normal;">
</span><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Atomic Physics </span></p>
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<span style="font-family: Symbol; font-size: 10pt; color: black;">·</span><span style="font-family: "Times New Roman"; font-size: 7pt; color: black; line-height: normal;">
</span><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Materials Science </span></p>
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<span style="font-family: Symbol; font-size: 10pt; color: black;">·</span><span style="font-family: "Times New Roman"; font-size: 7pt; color: black; line-height: normal;">
</span><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Tests of the Standard Model Physics</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Registration are opened at the link
</span><span style="font-family: Arial, sans-serif; font-size: 11pt; color: rgb(5, 99, 193);"><u><a style="color: rgb(5, 99, 193); margin-top: 0px; margin-bottom: 0px;" data-auth="NotApplicable" class="OWAAutoLink" id="OWAd30a80db-912f-b5e0-2224-bca743298f8a" href="https://www.jlab.org/conference/LEEPP">https://www.jlab.org/conference/LEEPP</a></u></span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"> Conference abstracts should be submitted at
</span><span style="font-family: Arial, sans-serif; font-size: 11pt; color: rgb(5, 99, 193);"><u><a style="color: rgb(5, 99, 193); margin-top: 0px; margin-bottom: 0px;" data-auth="NotApplicable" class="OWAAutoLink" id="OWA5ddeabd4-cbca-5acc-82c7-b83bb5df79e9" href="https://indico.jlab.org/event/964">https://indico.jlab.org/event/964</a></u></span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"> Looking forward to see you at the workshop.</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"><br>
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<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">The Organizing Committee,</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">David Cassidy (University College London)</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Joe Grames (Jefferson Lab) </span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Douglas Higinbotham (Jefferson Lab)</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Kevin Jordan (Jefferson Lab) </span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Tyler Kutz (Universität Mainz)</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Axel Schmidt (George Washington University) </span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Farida Selim (Arizona State University)</span></p>
<p style="background-color: white; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;">Eric Voutier (Université Paris-Saclay / IJCLab) - Contact</span></p>
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