Boosted Dark Matter

Owned by Francesco Nuti (Deactivated)
Last updated: Jun 16, 2022 by Matthew Gerathy (Deactivated)
2 min read

Coordinators:

Members:

Goal

Study processes expected to deposit larger energies > 1MeV and/or undergo multiple interactions.

Should distinguish between CR (heavy non-rel DM) and decay/inelastic boosted DM (two-three DM states that can decay into each other) (i.e., do the two need to be searched for in different ways).

CR-BDM will have an additional daily modulation signature as it passes through the earth. Interesting results could come from comparing observations (or lack thereof) in the Southern Hemisphere with those in the Northern. The LAB detector may also play a role, as previous constraints have been set by DUNE, MiniBoone and Super-K (all of these have high energy threshold, might we gain something if ours is lower?)

Investigated processes

  • Attenuation through the Earth and resulting modulation signal (nb: likely an intensive theoretical task)

  • Understanding of influence of usual detector effects

  • Influence of energy thresholds

  • Influence of geographical position

  • Influence of a particular target (NaI and/or LAB)

Planning

Process

Info

Signature

Selection

Background rate

Limits on signal rate

Limits on model parameters

Current limits

Process

Info

Signature

Selection

Background rate

Limits on signal rate

Limits on model parameters

Current limits

Inelastic scattering of BDM as investigated by COSINE-100

See below papers.

High energy interactions in both LS and NaI

Energy of the LS > 4 MeV

No tagged muons

Total energy of the NaI > 4 MeV

No alpha events in the NaI

The background muon flux can mimic the BDM signal.

Total expected muon flux
= 3.7e-8 cm-2s-1 (from Guangyong)

Approximate area of the experiment is
= 8*1.2*104 cm2

Giving a total muon flux of
= 308.88 counts/day

or 336034 counts over 3 years.

limit = 1.645 * sqrt(2*bg)

= 1348 counts over 3 years

= 1.23 counts/day

Note: This is a very pessimistic estimate and the muon detectors should tag a significant number of these muons, reducing the background. Better estimates/simulations of the muon background and veto efficiency can further refine this limit.

Theo

Theo

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference material

Inelastic Boosted Dark Matter - https://arxiv.org/abs/1811.09344

Cosmic Ray BDM - https://arxiv.org/pdf/2108.00583.pdf

 

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