Gamma-ray Constraints on Effective Interactions of the Dark Matter

Abstract

Using an effective interaction approach to describe the interactions between the dark matter particle and the light degrees of freedom of the standard model, we calculate the gamma-ray flux due to the annihilation of the dark matter into quarks, followed by fragmentation into neutral pions which subsequently decay into photons. By comparison to the mid-latitude data released from the Fermi-LAT experiment, we obtain useful constraints on the size of the effective interactions and they are found to be comparable to those deduced from collider, gamma-ray line and anti-matter search experiments. However, the two operators induced by scalar and vector exchange among fermionic dark matter and light quarks that contribute to spin-independent cross sections are constrained more stringently by the recent XENON100 data.

22 pages, 4 figures; title fixed and a couple of references added

References in corpus (9)

• Constraints on Dark Matter from Colliders
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• Non-relativistic effective theory of dark matter direct detection
• Gamma Ray Line Constraints on Effective Theories of Dark Matter
• On the Importance of Electroweak Corrections for Majorana Dark Matter Indirect Detection
• Conservative Constraints on Dark Matter Annihilation into Gamma Rays
• The Top Window for dark matter
• Cosmic Antiproton Constraints on Effective Interactions of the Dark Matter
• The GALPROP Cosmic-Ray Propagation Code