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Title: On dark matter interactions with the Standard Model through an anomalous Z'

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]
  1. Univ., of Pittsburgh, Pittsburgh, PA 15260 (United States)
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Département de Physique Théorique and Center for Astroparticle Physics (CAP), Geneva (Switzerland)
  3. Département de Physique Théorique and Center for Astroparticle Physics (CAP), Geneva (Switzerland)
+ Show Author Affiliations

We report on electroweak scale Dark Matter (DM) whose interactions with baryonic matter are mediated by a heavy anomalous Z'. We emphasize that when the DM is a Majorana particle, its low-velocity annihilations are dominated by loop suppressed annihilations into the gauge bosons, rather than by p-wave or chirally suppressed annihilations into the SM fermions. Because the Z' is anomalous, these kinds of DM models can be realized only as effective field theories (EFTs) with a well-defined cutoff, where heavy spectator fermions restore gauge invariance at high energies. We formulate these EFTs, estimate their cutoff and properly take into account the effect of the Chern-Simons terms one obtains after the spectator fermions are integrated out. We find that, while for light DM collider and direct detection experiments usually provide the strongest bounds, the bounds at higher masses are heavily dominated by indirect detection experiments, due to strong annihilation into W + W -, ZZ, Zγ and possibly into gg and γγ. We reiterate that these annihilation channels are generically significant because of the structure of the EFT, and therefore these models are prone to strong indirect detection constraints. Although we focus on selected Z' models for illustrative purposes, our setup is completely generic and can be used for analyzing the predictions of any anomalous Z'-mediated DM model with arbitrary charges.

Research Organization:
Univ., of Pittsburgh, Pittsburgh, PA 15260 (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0015634
OSTI ID:
1512434
Journal Information:
Journal of High Energy Physics (Online), Vol. 2017, Issue 10; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (4)

Simplified Dark Matter Models text January 2018
Simplified Dark Matter Models journal December 2018
LHC Searches for Dark Sector Showers text January 2017
Dark Matter in Anomaly-Free Gauge Extensions text January 2018

Figures / Tables (14)

Figure 1(p. 6)figure Figure 1
Figure 2(p. 8)figure Figure 2
Table 1(p. 12)table Table 1
Figure 3(p. 16)figure Figure 3
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Figure 12(p. 26)figure Figure 12
Figure 13(p. 27)figure Figure 13

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