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Title: Characterizing Higgs portal dark matter models at the ILC

For this article, we study the dark matter (DM) discovery prospect and its spin discrimination in the theoretical framework of gauge invariant and renormalizable Higgs portal DM models at the ILC with $$\sqrt{s}$$= 500 GeV. In such models, the DM pair is produced in association with a Z boson. In the case of the singlet scalar DM, the mediator is just the SM Higgs boson, whereas for the fermion or vector DM there is an additional singlet scalar mediator that mixes with the SM Higgs boson, which produces significant observable differences. After careful investigation of the signal and backgrounds both at parton level and at detector level, we find the signal with hadronically decaying Z boson provides a better search sensitivity than the signal with leptonically decaying Z boson. Taking the fermion DM model as a benchmark scenario, when the DM-mediator coupling g χ is relatively small, the DM signals are discoverable only for benchmark points with relatively light scalar mediator H 2. The spin discriminating from scalar DM is always promising, while it is difficult to discriminate from vector DM. As for g χ approaching the perturbative limit, benchmark points with the mediator H 2 in the full mass region of interest are discoverable. The spin discriminating aspects from both the scalar and the fermion DM are quite promising.
Authors:
 [1] ;  [2] ;  [2]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Physics and Astronomy
  2. Korea Inst. for Advanced Study, Seoul (Korea, Republic of). School of Physics
Publication Date:
Grant/Contract Number:
SC0010813; 2015R1A2A1A05001869; 2009-0083526
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 77; Journal Issue: 9; Journal ID: ISSN 1434-6044
Publisher:
Springer
Research Org:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Research Foundation of Korea (NRF); Seoul National Univ., Seoul (Korea, Republic of); Qatar National Research Fund, Doha (Oatar)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1424965