Capture and decay of electroweak WIMPonium

Pouya Asadi, Matthew Baumgart, Patrick J. Fitzpatrick, Emmett Krupczak, Tracy R. Slatyer

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The spectrum of Weakly-Interacting-Massive-Particle (WIMP) dark matter generically possesses bound states when the WIMP mass becomes sufficiently large relative to the mass of the electroweak gauge bosons. The presence of these bound states enhances the annihilation rate via resonances in the Sommerfeld enhancement, but they can also be produced directly with the emission of a low-energy photon. In this work we compute the rate for SU(2) triplet dark matter (the wino) to bind into WIMPonium - which is possible via single-photon emission for wino masses above 5 TeV for relative velocity v < O(10-2) - and study the subsequent decays of these bound states. We present results with applications beyond the wino case, e.g. for dark matter inhabiting a nonabelian dark sector; these include analytic capture and transition rates for general dark sectors in the limit of vanishing force carrier mass, efficient numerical routines for calculating positive and negative-energy eigenstates of a Hamiltonian containing interactions with both massive and massless force carriers, and a study of the scaling of bound state formation in the short-range Hulth&apos;{e}n potential. In the specific case of the wino, we find that the rate for bound state formation is suppressed relative to direct annihilation, and so provides only a small correction to the overall annihilation rate. The soft photons radiated by the capture process and by bound state transitions could permit measurement of the dark matter's quantum numbers; for wino-like dark matter, such photons are rare, but might be observable by a future ground-based gamma-ray telescope combining large effective area and a low energy threshold.

Original languageEnglish (US)
Article number005
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number2
DOIs
StatePublished - Feb 1 2017
Externally publishedYes

Fingerprint

dark matter
decay
weakly interacting massive particles
photons
sectors
gamma ray telescopes
particle mass
quantum numbers
energy
eigenvectors
bosons
scaling
thresholds
augmentation
interactions

Keywords

  • dark matter theory
  • gamma ray theory

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Capture and decay of electroweak WIMPonium. / Asadi, Pouya; Baumgart, Matthew; Fitzpatrick, Patrick J.; Krupczak, Emmett; Slatyer, Tracy R.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2017, No. 2, 005, 01.02.2017.

Research output: Contribution to journalArticle

Asadi, Pouya ; Baumgart, Matthew ; Fitzpatrick, Patrick J. ; Krupczak, Emmett ; Slatyer, Tracy R. / Capture and decay of electroweak WIMPonium. In: Journal of Cosmology and Astroparticle Physics. 2017 ; Vol. 2017, No. 2.
@article{ec3eef66cbdc468eb051868133f8bb34,
title = "Capture and decay of electroweak WIMPonium",
abstract = "The spectrum of Weakly-Interacting-Massive-Particle (WIMP) dark matter generically possesses bound states when the WIMP mass becomes sufficiently large relative to the mass of the electroweak gauge bosons. The presence of these bound states enhances the annihilation rate via resonances in the Sommerfeld enhancement, but they can also be produced directly with the emission of a low-energy photon. In this work we compute the rate for SU(2) triplet dark matter (the wino) to bind into WIMPonium - which is possible via single-photon emission for wino masses above 5 TeV for relative velocity v < O(10-2) - and study the subsequent decays of these bound states. We present results with applications beyond the wino case, e.g. for dark matter inhabiting a nonabelian dark sector; these include analytic capture and transition rates for general dark sectors in the limit of vanishing force carrier mass, efficient numerical routines for calculating positive and negative-energy eigenstates of a Hamiltonian containing interactions with both massive and massless force carriers, and a study of the scaling of bound state formation in the short-range Hulth'{e}n potential. In the specific case of the wino, we find that the rate for bound state formation is suppressed relative to direct annihilation, and so provides only a small correction to the overall annihilation rate. The soft photons radiated by the capture process and by bound state transitions could permit measurement of the dark matter's quantum numbers; for wino-like dark matter, such photons are rare, but might be observable by a future ground-based gamma-ray telescope combining large effective area and a low energy threshold.",
keywords = "dark matter theory, gamma ray theory",
author = "Pouya Asadi and Matthew Baumgart and Fitzpatrick, {Patrick J.} and Emmett Krupczak and Slatyer, {Tracy R.}",
year = "2017",
month = "2",
day = "1",
doi = "10.1088/1475-7516/2017/02/005",
language = "English (US)",
volume = "2017",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Capture and decay of electroweak WIMPonium

AU - Asadi, Pouya

AU - Baumgart, Matthew

AU - Fitzpatrick, Patrick J.

AU - Krupczak, Emmett

AU - Slatyer, Tracy R.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - The spectrum of Weakly-Interacting-Massive-Particle (WIMP) dark matter generically possesses bound states when the WIMP mass becomes sufficiently large relative to the mass of the electroweak gauge bosons. The presence of these bound states enhances the annihilation rate via resonances in the Sommerfeld enhancement, but they can also be produced directly with the emission of a low-energy photon. In this work we compute the rate for SU(2) triplet dark matter (the wino) to bind into WIMPonium - which is possible via single-photon emission for wino masses above 5 TeV for relative velocity v < O(10-2) - and study the subsequent decays of these bound states. We present results with applications beyond the wino case, e.g. for dark matter inhabiting a nonabelian dark sector; these include analytic capture and transition rates for general dark sectors in the limit of vanishing force carrier mass, efficient numerical routines for calculating positive and negative-energy eigenstates of a Hamiltonian containing interactions with both massive and massless force carriers, and a study of the scaling of bound state formation in the short-range Hulth'{e}n potential. In the specific case of the wino, we find that the rate for bound state formation is suppressed relative to direct annihilation, and so provides only a small correction to the overall annihilation rate. The soft photons radiated by the capture process and by bound state transitions could permit measurement of the dark matter's quantum numbers; for wino-like dark matter, such photons are rare, but might be observable by a future ground-based gamma-ray telescope combining large effective area and a low energy threshold.

AB - The spectrum of Weakly-Interacting-Massive-Particle (WIMP) dark matter generically possesses bound states when the WIMP mass becomes sufficiently large relative to the mass of the electroweak gauge bosons. The presence of these bound states enhances the annihilation rate via resonances in the Sommerfeld enhancement, but they can also be produced directly with the emission of a low-energy photon. In this work we compute the rate for SU(2) triplet dark matter (the wino) to bind into WIMPonium - which is possible via single-photon emission for wino masses above 5 TeV for relative velocity v < O(10-2) - and study the subsequent decays of these bound states. We present results with applications beyond the wino case, e.g. for dark matter inhabiting a nonabelian dark sector; these include analytic capture and transition rates for general dark sectors in the limit of vanishing force carrier mass, efficient numerical routines for calculating positive and negative-energy eigenstates of a Hamiltonian containing interactions with both massive and massless force carriers, and a study of the scaling of bound state formation in the short-range Hulth'{e}n potential. In the specific case of the wino, we find that the rate for bound state formation is suppressed relative to direct annihilation, and so provides only a small correction to the overall annihilation rate. The soft photons radiated by the capture process and by bound state transitions could permit measurement of the dark matter's quantum numbers; for wino-like dark matter, such photons are rare, but might be observable by a future ground-based gamma-ray telescope combining large effective area and a low energy threshold.

KW - dark matter theory

KW - gamma ray theory

UR - http://www.scopus.com/inward/record.url?scp=85014838904&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85014838904&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2017/02/005

DO - 10.1088/1475-7516/2017/02/005

M3 - Article

AN - SCOPUS:85014838904

VL - 2017

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 2

M1 - 005

ER -