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Indirect detection signatures for the origin of asymmetric dark matter

Zhao, Yue and Zurek, Kathryn M. (2014) Indirect detection signatures for the origin of asymmetric dark matter. Journal of High Energy Physics, 2014 (7). Art. No. 17. ISSN 1029-8479.

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We study the decay signatures of Asymmetric Dark Matter (ADM) via higher dimension operators which are responsible for generating the primordial dark matter (DM) asymmetry. Since the signatures are sensitive both to the nature of the higher dimension operator generating the DM asymmetry and to the sign of the baryon or lepton number that the DM carries, indirect detection may provide a window into the nature of the mechanism which generates the DM asymmetry. We consider in particular dimension-6 fermionic operators of the form O_(ADM) = X O_(B−L) /M^2, where O_(B−L) = u^cd^cd^c, ℓℓe^c, qℓd^c (or operators related through a Hermitian conjugate) with the scale M around or just below the GUT scale. We derive constraints on ADM particles both in the natural mass range (around a few GeV), as well as in the range between 100 GeV to 10 TeV. For light ADM, we focus on constraints from both the low energy gamma ray data and proton/antiproton fluxes. For heavy ADM, we consider γ-rays and proton/anti-proton fluxes, and we fit e+ /e− data from AMS-02 and H.E.S.S. (neglecting the Fermi charged particle fluxes which disagree with AMS-02 below 100 GeV). We show that, although the best fit regions from electron/positron measurement are still in tension with other channels on account of the H.E.S.S. measurement at high energies, compared to an ordinary symmetric dark matter scenario, the decay of DM with a primordial asymmetry reduces the tension. Better measurement of the flux at high energy will be necessary to draw a definite conclusion about the viability of decaying DM as source for the signals.

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Additional Information:© 2014 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. We would like to thank Marco Cirelli, Jeremy Mardon, Michele Papucci, Paolo Panci, Alessandro Strumia, Meng Su, Wei Xue for helpful discussions. The work of KZ is supported by NASA astrophysics theory grant NNX11AI17G and by NSF CAREER award PHY 1049896. YZ is supported by ERC grant BSMOXFORD no. 228169 and NSF grant PHY-1316699.
Funding AgencyGrant Number
European Research Council (ERC)228169
Subject Keywords:Cosmology of Theories beyond the SM, Beyond Standard Model
Issue or Number:7
Record Number:CaltechAUTHORS:20190613-164148873
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Official Citation:Zhao, Y. & Zurek, K.M. J. High Energ. Phys. (2014) 2014: 17.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96412
Deposited By: George Porter
Deposited On:17 Jun 2019 20:36
Last Modified:03 Oct 2019 21:22

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