Connecting the LHC diphoton excess to the Galatic Center gamma-ray excess

Xian-Jun Huang, Wei-Hong Zhang, and Yu-Feng Zhou
Phys. Rev. D 94, 035019 – Published 22 August 2016

Abstract

The recent LHC Run-2 data have shown a possible excess in diphoton events, suggesting the existence of a new resonance ϕ with mass M750GeV. If ϕ 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 Γ/M and ϕ decay channels, in a collection of DM models where the DM particle can be scalar, fermionic, and vector, and ϕ can be generated through s-channel gg fusion or qq¯ annihilation. We show that the minimally required Γ/M is determined by a single parameter proportional to (mχ/M)n, where the integer n depends on the nature of the DM particle. We find that for the scalar DM model with ϕ generated from qq¯ annihilation, the minimally required Γ/M can be as low as O(103). For the scalar DM model with ϕ generated from gg fusion and fermionic DM model with ϕ from qq¯ annihilation, the required Γ/M are typically of O(102). The vector DM models, however, require very large Γ/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 O(10311029)cm3s1, which are close to the current limits from the Fermi-LAT experiment.

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  • Received 7 June 2016

DOI:https://doi.org/10.1103/PhysRevD.94.035019

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Xian-Jun Huang*, Wei-Hong Zhang, and Yu-Feng Zhou

  • Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, ZhongGuanCun East Road 55, Beijing 100190, China
  • School of Physical Sciences, University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China

  • *huangxj@itp.ac.cn
  • whzhang@itp.ac.cn
  • yfzhou@itp.ac.cn

See Also

750 GeV diphoton excess and a dark matter messenger at the Galactic Center

Xian-Jun Huang, Wei-Hong Zhang, and Yu-Feng Zhou
Phys. Rev. D 93, 115006 (2016)

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Vol. 94, Iss. 3 — 1 August 2016

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