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Title: Detecting Stealth Dark Matter Directly through Electromagnetic Polarizability

We calculate the spin-independent scattering cross section for direct detection that results from the electromagnetic polarizability of a composite scalar “stealth baryon” dark matter candidate, arising from a dark SU(4) confining gauge theory—“stealth dark matter.” In the nonrelativistic limit, electromagnetic polarizability proceeds through a dimension-7 interaction leading to a very small scattering cross section for dark matter with weak-scale masses. This represents a lower bound on the scattering cross section for composite dark matter theories with electromagnetically charged constituents. We carry out lattice calculations of the polarizability for the lightest “baryon” states in SU(3) and SU(4) gauge theories using the background field method on quenched configurations. We find the polarizabilities of SU(3) and SU(4) to be comparable (within about 50%) normalized to the stealth baryon mass, which is suggestive for extensions to larger SU(N) groups. The resulting scattering cross sections with a xenon target are shown to be possibly detectable in the dark matter mass range of about 200–700 GeV, where the lower bound is from the existing LUX constraint while the upper bound is the coherent neutrino background. Significant uncertainties in the cross section remain due to the more complicated interaction of the polarizablity operator with nuclear structure; however,more » the steep dependence on the dark matter mass, 1/m6B, suggests the observable dark matter mass range is not appreciably modified. We highlight collider searches for the mesons in the theory as well as the indirect astrophysical effects that may also provide excellent probes of stealth dark matter.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [7] ;  [8] ;  [5] ;  [3] ;  [2] ;  [9] ;  [2] ;  [10] ;  [2] ;  [3] ;  [3]
  1. Yale Univ., New Haven, CT (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Boston Univ., MA (United States)
  4. Inst. of Nuclear Theory, Seatlle, WA (United States)
  5. Argonne Leadership Computing Facility, Argonne, IL (United States)
  6. Univ. of California, Davis, CA (United States)
  7. Univ. of Oregon, Eugene, OR (United States)
  8. Univ. of Colorado, Boulder, CO (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
  9. Syracuse Univ., NY (United States). Dept. of Physics
  10. Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
Publication Date:
OSTI Identifier:
1241951
Report Number(s):
LLNL--JRNL-667121
Journal ID: ISSN 0031-9007; TRN: US1600806
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Lattice Strong Dynamics (LSD) Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS