3-10 August 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

Dark Higgs Channel for FERMI GeV γ-ray Excess

Aug 8, 2016, 6:30 PM
2h
Riverwalk A/B

Riverwalk A/B

Poster Astro-particle Physics and Cosmology Poster Session

Speaker

pyungwon ko (Korea Inst. for Advanced Study (KIAS))

Description

Dark Higgs is very generic in dark matter models where DM is stabilized by some spontaneously broken dark gauge symmetries. Motivated by the FERMI observation of ∼GeV scale γ-ray excess from the galactic center (GC), we investigate a scenario that a pair of dark matter X annihilates into a pair of dark Higgs H2, which subsequently decays into standard model particles through its mixing with SM Higgs boson. Besides the two-body decay of H2, we also include multibody decay channels of the dark Higgs. We find that the best-fit point is around MX≃95.0GeV, MH2≃86.7GeV, ⟨σv⟩≃4.0×10−26cm3/s and gives a p-value ≃0.40. Implication of this result is described in the context of dark matter models with dark gauge symmetries. Since such a dark Higgs boson is very difficult to produce at colliders, indirect DM detections of cosmic γ-rays could be an important probe of dark sectors, complementary to collider searches.

Primary author

pyungwon ko (Korea Inst. for Advanced Study (KIAS))

Co-author

Dr Yong Tang (KIAS)

Presentation materials