Gamma-rays from dark showers with twin Higgs models

Freytsis, Marat; Knapen, Simon; Robinson, Dean J.; Tsai, Yuhsin

doi:10.1007/JHEP05(2016)018

Title: Gamma-rays from dark showers with twin Higgs models

Journal Article · Tue May 03 00:00:00 EDT 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP05(2016)018· OSTI ID:1379325

Freytsis, Marat ^[1]; Knapen, Simon ^[2]; Robinson, Dean J. ^[2]; Tsai, Yuhsin ^[3]

Univ. of Oregon, Eugene, OR (United States). Inst. of Theoretical Science
Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics

We consider a twin WIMP scenario whose twin sector contains a full dark copy of the SM hadrons, where the lightest twin particles are twin pions. By analogy to the standard WIMP paradigm, the dark matter (DM) freezes out through twin electroweak interactions, and annihilates into a dark shower of light twin hadrons. These are either stable or decay predominantly to standard model (SM) photons. We show that this ‘hadrosymmetric’ scenario can be consistent with all applicable astrophysical, cosmological and collider constraints. In order to decay the twin hadrons before the big-bang nucleosynthesis epoch, an additional portal between the SM and twin sector is required. In most cases we find this additional mediator is within reach of either the LHC or future intensity frontier experiments. Furthermore, we conduct simulations of the dark shower and consequent photon spectra. We find that fits of these spectra to the claimed galactic center gamma-ray excess seen by Fermi -LAT non-trivially coincide with regions of parameter space that both successfully generate the observed DM abundance and exhibit minimal fine-tuning.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; SC0011640; PHY-1066293; PHY-1002399; PHY-1315155

OSTI ID:: 1379325

Journal Information:: Journal of High Energy Physics (Online), Vol. 2016, Issue 5; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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