Gamma rays and positrons from a decaying hidden gauge boson

Chen, Chuan Ren; Takahashi, Fuminobu; Yanagida, Tsutomu T.

doi:10.1016/j.physletb.2008.11.048

Cited by 98 publications

(68 citation statements)

References 45 publications

(48 reference statements)

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“…In the hierarchical limit m N /m ψ DM → 0, the kinematical functions satisfy 8) whereas in the degenerate limit m N /m ψ DM → 1, one gets…”

Section: Decay Widthsmentioning

confidence: 99%

Gamma-ray lines from radiative dark matter decay

Garny¹,

Ibarra²,

Tran³

et al. 2011

J. Cosmol. Astropart. Phys.

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The decay of dark matter particles which are coupled predominantly to charged leptons has been proposed as a possible origin of excess high-energy positrons and electrons observed by cosmic-ray telescopes PAMELA and Fermi LAT. Even though the dark matter itself is electrically neutral, the tree-level decay of dark matter into charged lepton pairs will generically induce radiative two-body decays of dark matter at the quantum level. Using an effective theory of leptophilic dark matter decay, we calculate the rates of radiative two-body decays for scalar and fermionic dark matter particles. Due to the absence of astrophysical sources of monochromatic gamma rays, the observation of a line in the diffuse gamma-ray spectrum would constitute a strong indication of a particle physics origin of these photons. We estimate the intensity of the gamma-ray line that may be present in the energy range of a few TeV if the dark matter decay interpretation of the leptonic cosmic-ray anomalies is correct and comment on observational prospects of present and future Imaging Cherenkov Telescopes, in particular the CTA.

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“…In the hierarchical limit m N /m ψ DM → 0, the kinematical functions satisfy 8) whereas in the degenerate limit m N /m ψ DM → 1, one gets…”

Section: Decay Widthsmentioning

confidence: 99%

Gamma-ray lines from radiative dark matter decay

Garny¹,

Ibarra²,

Tran³

et al. 2011

J. Cosmol. Astropart. Phys.

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“…Such decays are wellmotivated and natural in many classes of DM modelsincluding, for example, R-parity violating decays of the neutralino [1] or gravitino [2,3], moduli DM [4], axinos [5], sterile neutrinos [6] and hidden U (1) gauge boson [7] -but are unlikely to be probed in any terrestrial experiment, due to their very long timescales. Only indirect searches have the potential to observe DM decay products; furthermore, only studies of the early universe may be able to probe scenarios where a sub-component of DM decays with a lifetime shorter than the present age of the universe.…”

Section: Introductionmentioning

confidence: 99%

General constraints on dark matter decay from the cosmic microwave background

2017

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Precise measurements of the temperature and polarization anisotropies of the cosmic microwave background can be used to constrain the annihilation and decay of dark matter. In this work, we demonstrate via principal component analysis that the imprint of dark matter decay on the cosmic microwave background can be approximately parameterized by a single number for any given dark matter model. We develop a simple prescription for computing this model-dependent detectability factor, and demonstrate how this approach can be used to set model-independent bounds on a large class of decaying dark matter scenarios. We repeat our analysis for decay lifetimes shorter than the age of the universe, allowing us to set constraints on metastable species other than the dark matter decaying at early times, and decays that only liberate a tiny fraction of the dark matter mass energy. We set precise bounds and validate our principal component analysis using a Markov Chain Monte Carlo approach and Planck 2015 data.PACS numbers: 95.35.+d,98.80.Es

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“…In the rest of this paper, we will work within this simple model for dark photon mass generation and study the consequences. The final transformation between the basis (A 0 , Z 0 , A 0 ) T and the mass eigenstate (A, Z, A ) T can be expressed as 9) where the transformation matrix…”

Section: Jhep03(2018)139mentioning

confidence: 99%

“…This is a portal between a possible dark sector and the SM sector. The existence of U(1) A has many interesting effects in particle physics, astrophysics and cosmology [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Great efforts have been made to search for a dark photon through various processes and stringent limits have been obtained for the kinetic mixing parameter for a given dark photon mass m A [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Search for a heavy dark photon at future e+e− colliders

Huang

et al. 2018

J. High Energ. Phys.

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A coupling of a dark photon A from a U(1) A with the standard model (SM) particles can be generated through kinetic mixing represented by a parameter . A non-zero also induces a mixing between A and Z if dark photon mass m A is not zero. This mixing can be large when m A is close to m Z even if the parameter is small. Many efforts have been made to constrain the parameter for a low dark photon mass m A compared with the Z boson mass m Z . We study the search for dark photon in e + e − → γA → γµ + µ − for a dark photon mass m A as large as kinematically allowed at future e + e − colliders. For large m A , care should be taken to properly treat possible large mixing between A and Z. We obtain sensitivities to the parameter for a wide range of dark photon mass at planed e + e − colliders, such as Circular Electron Positron Collider (CEPC), International Linear Collider (ILC) and Future Circular Collider (FCC-ee). For the dark photon mass 20 GeV m A 330 GeV, the 2σ exclusion limits on the mixing parameter are 10 −3 -10 −2 . The CEPC with √ s = 240 GeV and FCC-ee with √ s = 160 GeV are more sensitive than the constraint from current LHCb measurement once the dark photon mass m A 50 GeV. For m A 220 GeV, the sensitivity at the FCC-ee with √ s = 350 GeV and 1.5 ab −1 is better than that at the 13 TeV LHC with 300 fb −1 , while the sensitivity at the CEPC with √ s = 240 GeV and 5 ab −1 can be even better than that at 13 TeV LHC with 3 ab −1 for m A 180 GeV. We also comment on sensitivities of e + e − → γA with dark photon decay into several other channels at future e + e − colliders.

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Gamma rays and positrons from a decaying hidden gauge boson

Cited by 98 publications

References 45 publications

Gamma-ray lines from radiative dark matter decay

Gamma-ray lines from radiative dark matter decay

General constraints on dark matter decay from the cosmic microwave background

Search for a heavy dark photon at future e+e− colliders

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