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

Abstract

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 setupmore » is completely generic and can be used for analyzing the predictions of any anomalous Z'-mediated DM model with arbitrary charges.« less

Authors:
 [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)
Publication Date:
Research Org.:
Univ., of Pittsburgh, Pittsburgh, PA 15260 (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1512434
Grant/Contract Number:  
SC0015634
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Anomalies in Field and String Theories; Beyond Standard Model; Cosmology of Theories beyond the SM

Citation Formats

Ismail, Ahmed, Katz, Andrey, and Racco, Davide. On dark matter interactions with the Standard Model through an anomalous Z'. United States: N. p., 2017. Web. doi:10.1007/jhep10(2017)165.
Ismail, Ahmed, Katz, Andrey, & Racco, Davide. On dark matter interactions with the Standard Model through an anomalous Z'. United States. doi:10.1007/jhep10(2017)165.
Ismail, Ahmed, Katz, Andrey, and Racco, Davide. Tue . "On dark matter interactions with the Standard Model through an anomalous Z'". United States. doi:10.1007/jhep10(2017)165. https://www.osti.gov/servlets/purl/1512434.
@article{osti_1512434,
title = {On dark matter interactions with the Standard Model through an anomalous Z'},
author = {Ismail, Ahmed and Katz, Andrey and Racco, Davide},
abstractNote = {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.},
doi = {10.1007/jhep10(2017)165},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 10,
volume = 2017,
place = {United States},
year = {2017},
month = {10}
}

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Cited by: 12 works
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