[BDXlist] [EXTERNAL] JPOS white paper - dark sector searches at JLab with a positron beam

[Andrea Celentano]

Dear BDX colleagues,
Jefferson Laboratory recently started to investigate the physics potential of experiments making use of a future, possible positron beam at this facility, ranging from traditional hadron physics measurements to beyond-standard-model searches.
These ideas have been recently discussed at the JPOS17 meeting (https://www.jlab.org/conferences/JPos2017/ <https://www.jlab.org/conferences/JPos2017/>), organized with the support of the INFN community. The idea of exploiting this beam for dark photon and light dark matter searches was presented at this conference: Paolo Valente first gave an introductory talk concerning dark sector searches with positrons (jpos17_valente_compressed.pptx <https://www.jlab.org/indico/event/206/session/25/contribution/87/material/slides/0.pptx>), followed by a talk from Luca Marsicano (Luca_Marsicano_JPOS17.pdf <https://www.jlab.org/indico/event/206/session/25/contribution/91/material/paper/0.pdf>) discussing the possibility of a positron beam, thin-target “PADME-like” experiment.

At the moment, the possibility of running a positron beam at JLab is at the proposal level, but the community is working coherently to make this real in the near future. As a follow-up, a White Paper collecting ideas for experiments at Jefferson Lab with a future positron beam is currently being prepared. We drafted a document describing both a thin-target and a thick-target experiment: you find it attached. The list of authors is clearly not final, we are working on it.

In particular, we think that the thin-target experiment can be run starting from the day-1 of the JLab future positron era, benefitting from the equipment and the experience of the existing PADME experiment. The thick-target experiment, instead, will require some dedicated R&D, both on the detector and on the accelerator, and thus we foresee it as a future step.

We invite you to send us comments for this document, and we also ask you if you are interested to sign it. To do so, please send your contribution to Andrea Celentano (andrea.celentano (at) ge.infn.it). 
We’d like to ask you to within one week, before Sunday, May 24th.

Thanks,

Bests,
Andrea, Luca, Marco, Mauro, Paolo

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