Gamma-ray constraints on decaying dark matter

Chuan Ren Chen; Sourav K. Mandal; Fuminobu Takahashi

doi:10.1142/S0217732310000125

Gamma-ray constraints on decaying dark matter

Chuan Ren Chen^*, Sourav K. Mandal, Fuminobu Takahashi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The anomalies in positron fraction observed in PAMELA and total flux of electrons and positron reported by Fermi can be explained by a decaying dark matter. The agreement between astrophysical background and observed data in anti-proton indicates a lep-tophilic dark matter and constrains the hadronic decay branching ratios. In this work, we study the constrains on decaying rates of a dark matter to various 2-body final states using the Fermi and HESS gamma-ray data. We find that μ⁺μ^- or τ⁺τ^- final state is preferred to simultaneously explain the excesses and meet the gamma-ray constrains.

Original language	English
Pages (from-to)	969-975
Number of pages	7
Journal	Modern Physics Letters A
Volume	25
Issue number	11-12
DOIs	https://doi.org/10.1142/S0217732310000125
Publication status	Published - 2010 Apr 20
Externally published	Yes

Keywords

Cosmic-ray
Dark matter

ASJC Scopus subject areas

Nuclear and High Energy Physics
Astronomy and Astrophysics
General Physics and Astronomy

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10.1142/S0217732310000125

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title = "Gamma-ray constraints on decaying dark matter",

abstract = "The anomalies in positron fraction observed in PAMELA and total flux of electrons and positron reported by Fermi can be explained by a decaying dark matter. The agreement between astrophysical background and observed data in anti-proton indicates a lep-tophilic dark matter and constrains the hadronic decay branching ratios. In this work, we study the constrains on decaying rates of a dark matter to various 2-body final states using the Fermi and HESS gamma-ray data. We find that μ+μ- or τ+τ- final state is preferred to simultaneously explain the excesses and meet the gamma-ray constrains.",

keywords = "Cosmic-ray, Dark matter",

author = "Chen, {Chuan Ren} and Mandal, {Sourav K.} and Fuminobu Takahashi",

note = "Funding Information: This work was supported by World Premier International Center Initiative (WPI Program), MEXT, Japan.",

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doi = "10.1142/S0217732310000125",

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T1 - Gamma-ray constraints on decaying dark matter

AU - Chen, Chuan Ren

AU - Mandal, Sourav K.

AU - Takahashi, Fuminobu

N1 - Funding Information: This work was supported by World Premier International Center Initiative (WPI Program), MEXT, Japan.

PY - 2010/4/20

Y1 - 2010/4/20

N2 - The anomalies in positron fraction observed in PAMELA and total flux of electrons and positron reported by Fermi can be explained by a decaying dark matter. The agreement between astrophysical background and observed data in anti-proton indicates a lep-tophilic dark matter and constrains the hadronic decay branching ratios. In this work, we study the constrains on decaying rates of a dark matter to various 2-body final states using the Fermi and HESS gamma-ray data. We find that μ+μ- or τ+τ- final state is preferred to simultaneously explain the excesses and meet the gamma-ray constrains.

AB - The anomalies in positron fraction observed in PAMELA and total flux of electrons and positron reported by Fermi can be explained by a decaying dark matter. The agreement between astrophysical background and observed data in anti-proton indicates a lep-tophilic dark matter and constrains the hadronic decay branching ratios. In this work, we study the constrains on decaying rates of a dark matter to various 2-body final states using the Fermi and HESS gamma-ray data. We find that μ+μ- or τ+τ- final state is preferred to simultaneously explain the excesses and meet the gamma-ray constrains.

KW - Cosmic-ray

KW - Dark matter

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IS - 11-12

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Gamma-ray constraints on decaying dark matter

Abstract

Keywords

ASJC Scopus subject areas

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