Circularly polarized gamma rays in effective dark matter theory

Wei Chih Huang*, Kin Wang Ng, Tzu Chiang Yuan

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Resumé

We study the loop-induced circularly polarized gamma rays from dark matter annihilation using the effective dark matter theory approach. Both neutral scalar and fermionic dark matter annihilating into monochromatic diphoton and Z-photon final states are considered. To generate the circular polarization asymmetry, P and CP symmetries must be violated in the couplings between dark matter and Standard Model fermions inside the loop with non-vanishing Cutkosky cut. The asymmetry can be sizable especially for Z-photon final state for which asymmetry of nearly 90% can be reached. We discuss the prospect for detecting the circular polarization asymmetry of the gamma-ray flux from dark matter annihilation in the Galactic Center in future gamma-ray polarimetry experiments.

OriginalsprogEngelsk
Artikelnummer135104
TidsskriftPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Vol/bind800
Antal sider10
ISSN0370-2693
DOI
StatusUdgivet - 10. jan. 2020

Fingeraftryk

dark matter
gamma rays
asymmetry
circular polarization
polarimetry
photons
fermions
scalars
symmetry

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title = "Circularly polarized gamma rays in effective dark matter theory",
abstract = "We study the loop-induced circularly polarized gamma rays from dark matter annihilation using the effective dark matter theory approach. Both neutral scalar and fermionic dark matter annihilating into monochromatic diphoton and Z-photon final states are considered. To generate the circular polarization asymmetry, P and CP symmetries must be violated in the couplings between dark matter and Standard Model fermions inside the loop with non-vanishing Cutkosky cut. The asymmetry can be sizable especially for Z-photon final state for which asymmetry of nearly 90{\%} can be reached. We discuss the prospect for detecting the circular polarization asymmetry of the gamma-ray flux from dark matter annihilation in the Galactic Center in future gamma-ray polarimetry experiments.",
author = "Huang, {Wei Chih} and Ng, {Kin Wang} and Yuan, {Tzu Chiang}",
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Circularly polarized gamma rays in effective dark matter theory. / Huang, Wei Chih; Ng, Kin Wang; Yuan, Tzu Chiang.

I: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Bind 800, 135104, 10.01.2020.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Circularly polarized gamma rays in effective dark matter theory

AU - Huang, Wei Chih

AU - Ng, Kin Wang

AU - Yuan, Tzu Chiang

PY - 2020/1/10

Y1 - 2020/1/10

N2 - We study the loop-induced circularly polarized gamma rays from dark matter annihilation using the effective dark matter theory approach. Both neutral scalar and fermionic dark matter annihilating into monochromatic diphoton and Z-photon final states are considered. To generate the circular polarization asymmetry, P and CP symmetries must be violated in the couplings between dark matter and Standard Model fermions inside the loop with non-vanishing Cutkosky cut. The asymmetry can be sizable especially for Z-photon final state for which asymmetry of nearly 90% can be reached. We discuss the prospect for detecting the circular polarization asymmetry of the gamma-ray flux from dark matter annihilation in the Galactic Center in future gamma-ray polarimetry experiments.

AB - We study the loop-induced circularly polarized gamma rays from dark matter annihilation using the effective dark matter theory approach. Both neutral scalar and fermionic dark matter annihilating into monochromatic diphoton and Z-photon final states are considered. To generate the circular polarization asymmetry, P and CP symmetries must be violated in the couplings between dark matter and Standard Model fermions inside the loop with non-vanishing Cutkosky cut. The asymmetry can be sizable especially for Z-photon final state for which asymmetry of nearly 90% can be reached. We discuss the prospect for detecting the circular polarization asymmetry of the gamma-ray flux from dark matter annihilation in the Galactic Center in future gamma-ray polarimetry experiments.

U2 - 10.1016/j.physletb.2019.135104

DO - 10.1016/j.physletb.2019.135104

M3 - Journal article

AN - SCOPUS:85075548826

VL - 800

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

SN - 0370-2693

M1 - 135104

ER -