SnowMass2021

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====== NF03: BSM ======
Co-Conveners: Pilar Coloma (IFT, Madrid), Lisa Koerner (U. of Houston), Ian Shoemaker (Virginia Tech), Jae Yu (UT Arlington)

===== Description=====
This topical group focuses on **searches for signals from physics Beyond the Standard Model** (BSM), both from a theoretical and experimental perspective. 
Specific topics include (but are not limited to) the following:

**Neutrino-related BSM topics:**
  - Sterile Neutrino (aka Heavy Neutral Lepton) signals in a variety of experiments: fixed targets, atmospheric neutrinos, colliders, supernovae, etc 
  - Imprints of Kaluza-Klein modes in oscillations, in models with extra dimensions.
  - Searches for Lorentz and CPT violation signals. 
  - Non-standard neutrino interactions (NSI) and non-unitarity of the PMNS (NU), including NSI from models with new light mediators (Z'). 
  - Testable Leptogenesis scenarios, specially those originating from low-scale seesaw models 
  - Models leading to neutrino-dark matter portals, and bounds from neutrino experiments.
  - Neutrino tridents in models with new low-mass mediators 
  - Bounds on neutrino decay from oscillation data (solar, long-baseline, short-baseline), as well as from high-energy astrophysical neutrinos.

**Searches for BSM in other sectors using Neutrino Facilities:**
  - Searches for low-mass dark matter/dark photons using neutrino beam experiments, including dark tridents
  - Searches for (in)elastic boosted dark matter in large neutrino detectors
  - Searches for milli-charged particles, using neutrino beam experiments as well as atmospheric neutrino detectors
  - Baryon number violation in large neutrino detectors, including nucleon decay and n-nbar oscillations
  - Lepton-flavor violation searches, and their consequences for neutrino mass models
  - Neutrinoless double-beta decay: current status, prospects and implications for neutrino mass models

===== Activities =====
**Kick-off meeting**: a fully virtual meeting which will span two 3-hour sessions, divided into two different days:
  - __September 17th (9am to 12pm Chicago time)__: this day will be devoted to BSM in the neutrino sector. Indico page: https://indico.fnal.gov/event/44987/
  - __October 1st (9am to 12pm Chicago time)__: this day will be devoted to BSM scenarios in other sectors, that can be tested using neutrino experiments. Indico page: https://indico.fnal.gov/event/44988/
The program will include a combination of general overview talks, more focused talks by authors of specific LoIs, and discussion sessions. 

**Joint workshop with other topical groups**: this will be a joint workshop between several topical groups in the Neutrino Frontier, Rare Processes & Precision Frontier, and Theory Frontier. Depending on the situation regarding the COVID pandemic, this may be a face-to-face workshop, or a fully virtual one. Tentative dates are **Feb 24 - Feb 27, 2021**. More information will follow soon.


===== Submitted LOI =====
Here is the list of submitted LOIs to this topical group.   First index before "/"  corresponds to the primary frontier used for the submission.
 {{url>https://www.snowmass21.org/docs/files/list.php?frontier=NF3  border 100%,2000px}}