Indirect detection of the partial p wave via the s wave in the annihilation cross section of dark matter

Clark, Steven J.; Dent, James B.; Dutta, Bhaskar; Strigari, Louis E.

doi:10.1103/PhysRevD.99.083003

Title: Indirect detection of the partial $p$ wave via the $s$ wave in the annihilation cross section of dark matter

Journal Article · Tue Apr 09 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.99.083003· OSTI ID:1505881

Clark, Steven J.; Dent, James B.; Dutta, Bhaskar; Strigari, Louis E.

For many dark matter models, the annihilation cross section to two-body final states is difficult to probe with current experiments because the dominant annihilation channel is velocity or helicity suppressed. The inclusion of gauge boson radiation for three-body final states can lift the helicity suppression, allowing a velocity-independent cross section to dominate the annihilation process, and providing an avenue to constrain these models. Here we examine experimental constraints on dark matter that annihilates to two leptons plus a bremsstrahlung boson, ℓ¯ + ℓ + γ/W/Z. We consider experimental constraints on photon final states from Fermi-LAT using both diffuse photon data and data from dwarf spheroidal galaxies, and compare to the implied constraints from 21 cm measurements. Diffuse photon line searches are generally the strongest over the entire mass regime. We in particular highlight the model in which dark matter annihilates to two neutrinos and a photon, and show that these models are more strongly constrained through photon measurements than through existing neutrino bounds.

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Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: de-sc0010813; SC0010813; PHY-1820801

OSTI ID:: 1505881

Alternate ID(s):: OSTI ID: 1611535

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 99 Journal Issue: 8; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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