====== RF6: Dark Sector Studies at High Intensities ======

Dark sectors — new physics neutral under Standard Model forces — can interact with ordinary matter through a few types of “portal” interaction constrained by Standard Model symmetries.  This possibility has gained attention both as a paradigm for dark matter (stable dark sector particles are natural dark matter candidates, and can realize thermal freeze-out below the Lee-Weinberg bound) and as a broad framework for exploring new, weakly coupled physics. Dark sector particles are expected to have very weak couplings to ordinary matter, and motivate dedicated searches in high-intensity experiments.  Simple and notable examples of dark sectors include low-mass dark matter interacting through a new force, minimal models of a scalar or vector mediator, and particles with weak long-range interactions such as millicharges.

===== Topic  Conveners=====
^Name ^Institution ^email |
|Stefania Gori|University of California, Santa Cruz|sgori[at]ucsc.edu|
|Michael Williams|MIT|mwill[at]mit.edu|


===== Description=====

This Topical Group will address the following areas of dark-sector physics (in parenthesis our sub-conveners):

  -Theory of dark sectors (Brian Batell, Philip Schuster)
  -Dark sectors at electron-positron colliders (Chris Hearty)
  -Dark sectors at fixed target / beam dump experiments (electron, positron, proton, and muon beams) (Gordan Krnjaic, Phil Harris, Natalia Toro)
  -Dark sectors at kaon factories (Babette Dobrich, Jure Zupan)
  -Low-mass dark sectors at energy-frontier facilities (cross-group with [[energy/bsm_general|EF09 - BSM: More general explorations]] / [[energy/dark_matter|EF10 - BSM: Dark Matter at colliders]]) (Phil Ilten)
  -Dark sectors at neutrino experiments (cross-group with [[neutrino/bsm/start|NF03 - Neutrino physics - BSM]]) (Pilar Coloma)
  -Other experimental opportunities 

References to recent community-driven reports on dark sectors:

  * [[https://arxiv.org/abs/1902.00260|CERN PBC report]]
  *[[https://science.osti.gov/-/media/hep/pdf/Reports/Dark_Matter_New_Initiatives_rpt.pdf?la=en&hash=FCA512364A61567D7442A270D072273DDB56E2B4|Dark Matter New Initiatives BRN report]] (PRD1)
  * [[https://arxiv.org/pdf/1707.04591|Cosmic Visions New Ideas in Dark Matter]] (see, e.g., Sec. 6)
  * [[https://arxiv.org/pdf/1608.08632|Dark Sectors 2016:]]
===== Expression of Interest=====
In order for us to identify areas of interest, it would be great if you could fill out the google form at 
https://docs.google.com/forms/d/e/1FAIpQLSeLEgcQxYTooyS17LoR06GpZD2tXBu8QG4hQqvPTxSwTIE78w/viewform

===== Deadlines=====
Letters of Interest (April 1 – August 31, 2020) – https://snowmass21.org/loi\\
Please submit your LOI at https://www.snowmass21.org/docs/upload.php

Contributed Papers (April 1 – July 31, 2021) – https://snowmass21.org/submissions/

===== Meetings=====
RF6 kickoff meeting. August 12-13 (two half days).\\
https://indico.fnal.gov/event/44819/

EF9/EF10/RF6/AF5 joint meeting on dark sectors. July 15-16, 8am-11am Pacific.\\
https://indico.fnal.gov/event/44030/overview

Rare Processes and precision kickoff meeting. July 27, 7am-3pm Pacific.\\
https://indico.fnal.gov/event/44121/overview
===== Contacts ======
Please do not hesitate to contact us if you have questions, suggestion, or even just to express your interest, via email: [[sgori@ucsc.edu,mwill@mit.edu?subject=Snowmass RF06|Stefania Gori, Michael Williams]]

If you prefer, you can send an email or a message to our slack channel. We will also write to the mailing list and slack channels announcements relevant for the group.

To join our mailing list:
Send an e-mail message to listserv[at]fnal.gov

Leave the subject line blank
Type “SUBSCRIBE SNOWMASS-RPF-06-DARK-SECTOR FIRSTNAME LASTNAME” (without the quotation marks) in the body of your message. You'll get a Slack invitation when that subscription is approved.

To only join slack:

See the instructions on the SnowMass2021 home page for joining the snowmass2021 slack workspace. Our channel is #rpf-06-dark-sector which you can easily join once accepted to the snowmass2021 workspace, e.g., by pasting the channel name into the search bar or clicking the "+" button next to "channels" when in the snowmass2021 workspace and finding our channel, then clicking on our channel and subsequently clicking the "join" button. 


===== Submitted LOI =====
Here is the list of submitted LOIs to this  topic. 
 First index before "/"  corresponds to the primary frontier used for the submission.
 {{url>https://www.snowmass21.org/docs/files/list.php?frontier=RF6  noborder 95%,600px}}