skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Study of dark matter and QCD-charged mediators in the quasidegenerate regime

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1414980
Grant/Contract Number:
SC007859
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 96; Journal Issue: 11; Related Information: CHORUS Timestamp: 2017-12-27 10:00:12; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Davidson, Andrew, Kelso, Chris, Kumar, Jason, Sandick, Pearl, and Stengel, Patrick. Study of dark matter and QCD-charged mediators in the quasidegenerate regime. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.96.115029.
Davidson, Andrew, Kelso, Chris, Kumar, Jason, Sandick, Pearl, & Stengel, Patrick. Study of dark matter and QCD-charged mediators in the quasidegenerate regime. United States. doi:10.1103/PhysRevD.96.115029.
Davidson, Andrew, Kelso, Chris, Kumar, Jason, Sandick, Pearl, and Stengel, Patrick. 2017. "Study of dark matter and QCD-charged mediators in the quasidegenerate regime". United States. doi:10.1103/PhysRevD.96.115029.
@article{osti_1414980,
title = {Study of dark matter and QCD-charged mediators in the quasidegenerate regime},
author = {Davidson, Andrew and Kelso, Chris and Kumar, Jason and Sandick, Pearl and Stengel, Patrick},
abstractNote = {},
doi = {10.1103/PhysRevD.96.115029},
journal = {Physical Review D},
number = 11,
volume = 96,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 27, 2018
Publisher's Accepted Manuscript

Save / Share:
  • Cited by 7
  • We introduce a Minimal Simplified Dark Matter (MSDM) framework to quantitatively characterise dark matter (DM) searches at the LHC. We study two MSDM models where the DM is a Dirac fermion which interacts with a vector and axial-vector mediator. The models are characterised by four parameters: m DM, M med , g DM and g q, the DM and mediator masses, and the mediator couplings to DM and quarks respectively. The MSDM models accurately capture the full event kinematics, and the dependence on all masses and couplings can be systematically studied. The interpretation of mono-jet searches in this framework canmore » be used to establish an equal-footing comparison with direct detection experiments. For theories with a vector mediator, LHC mono-jet searches possess better sensitivity than direct detection searches for light DM masses (≲5 GeV). For axial-vector mediators, LHC and direct detection searches generally probe orthogonal directions in the parameter space. We explore the projected limits of these searches from the ultimate reach of the LHC and multi-ton xenon direct detection experiments, and find that the complementarity of the searches remains. In conclusion, we provide a comparison of limits in the MSDM and effective field theory (EFT) frameworks to highlight the deficiencies of the EFT framework, particularly when exploring the complementarity of mono-jet and direct detection searches.« less
  • Dark matter interacting via the exchange of a light pseudoscalar can induce observable signals in indirect detection experiments and experience large self-interactions while evading the strong bounds from direct dark matter searches. The pseudoscalar mediator will however induce flavour-changing interactions in the Standard Model, providing a promising alternative way to test these models. We investigate in detail the constraints arising from rare meson decays and fixed target experiments for different coupling structures between the pseudoscalar and Standard Model fermions. The resulting bounds are highly complementary to the information inferred from the dark matter relic density and the constraints from primordialmore » nucleosynthesis. We discuss the implications of our findings for the dark matter self-interaction cross section and the prospects of probing dark matter coupled to a light pseudoscalar with direct or indirect detection experiments. In particular, we find that a pseudoscalar mediator can only explain the Galactic Centre excess if its mass is above that of the B mesons, and that it is impossible to obtain a sufficiently large direct detection cross section to account for the DAMA modulation.« less
  • Cited by 1
  • We calculate the neutrino signal resulting from annihilation of secluded dark matter in the Sun. In this class of models, dark matter annihilates first into metastable mediators, which subsequently decay into Standard Model particles. If the mediators are long lived, they will propagate out from the dense solar core before decaying. High energy neutrinos undergo absorption in the Sun. In the standard scenario in which neutrinos are produced directly in the centre of the Sun, absorption is relevant for E∼>100 GeV, resulting in a significant suppression of the neutrino spectrum beyond E ∼ 1 TeV. In the secluded dark mattermore » scenario, the neutrino signal is greatly enhanced because neutrinos are injected away from the core, at lower density. Since the solar density falls exponentially with radius, metastable mediators have a significant effect on the neutrino flux, even for decay lengths which are small compared to the solar radius. Moreover, since neutrino detection cross sections grow with energy, this enhancement of the high energy region of the neutrino spectrum would have a large effect on overall event rates.« less