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Huang, XJ; Zhang, WH; Zhou, YF; Zhou, YF (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Theoret Phys, ZhongGuanCun East Rd 55, Beijing 100190, Peoples R China.
Connecting the LHC diphoton excess to the Galatic Center gamma-ray excess
Source PublicationPHYSICAL REVIEW D
Language英语
AbstractThe recent LHC Run-2 data have shown a possible excess in diphoton events, suggesting the existence of a new resonance phi with mass M similar to 750 GeV. If phi plays the role of a portal particle connecting the Standard Model and the invisible dark sector, the diphoton excess should be correlated with another photon excess, namely, the excess in the diffuse gamma rays towards the Galactic Center, which can be interpreted by the annihilation of dark matter (DM). We investigate the necessary conditions for a consistent explanation for the two photon excesses, especially the requirement on the width-to-mass ratio Gamma/M and phi decay channels, in a collection of DM models where the DM particle can be scalar, fermionic, and vector, and phi can be generated through s-channel gg fusion or qq annihilation. We show that the minimally required Gamma/M is determined by a single parameter proportional to (m(chi)/M)(n),where the integer n depends on the nature of the DM particle. We find that for the scalar DM model with phi generated from qq annihilation, the minimally required Gamma/M can be as low as Omicron(10(-3)). For the scalar DM model with phi generated from gg fusion and fermionic DM model with phi from qq annihilation, the required Gamma/M are typically of Omicron(10(-2)). The vector DM models, however, require very large Gamma/M of order one. For the DM models which can consistently explain both the excesses, the predicted cross sections for gamma-ray line are typically of Omicron(10(-31)-10(-29)) cm(3) s(-1), which are close to the current limits from the Fermi-LAT experiment.
2016
Volume94Issue:3Pages:35019
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevD.94.035019
Indexed BySCI
Funding OrganizationNSFC [11335012, 11475237] ; NSFC [11335012, 11475237] ; NSFC [11335012, 11475237] ; NSFC [11335012, 11475237]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21557
Collection理论物理所科研产出_SCI期刊论文
Corresponding AuthorHuang, XJ; Zhang, WH; Zhou, YF (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Theoret Phys, ZhongGuanCun East Rd 55, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Huang, XJ,Zhang, WH,Zhou, YF,et al. Connecting the LHC diphoton excess to the Galatic Center gamma-ray excess[J]. PHYSICAL REVIEW D,2016,94(3):35019.
APA Huang, XJ,Zhang, WH,Zhou, YF,&Zhou, YF .(2016).Connecting the LHC diphoton excess to the Galatic Center gamma-ray excess.PHYSICAL REVIEW D,94(3),35019.
MLA Huang, XJ,et al."Connecting the LHC diphoton excess to the Galatic Center gamma-ray excess".PHYSICAL REVIEW D 94.3(2016):35019.
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