Majorana dark matter in a classically scale invariant model

Benić, Sanjin and Radovčić, Branimir (2015) Majorana dark matter in a classically scale invariant model. Journal of High Energy Physics, 2015 (1). pp. 143-16. ISSN 1029-8479

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Abstract

We analyze a classically scale invariant extension of the Standard Model with a dark gauge U(1) X broken by a doubly charge scalar Φ leaving a remnant Z 2 symmetry. Dark fermions are introduced as dark matter candidates and for anomaly reasons we introduce two chiral fermions. Due to classical scale invariance, bare mass term that would mix these two states is absent and they end up as stable Majorana fermions N 1 and N 2. We calculate cross sections for N a N a → ϕϕ, N a N a → X μ ϕ and N 2 N 2 → N 1 N 1 annihilation channels. We put constraints to the model from the Higgs searches at the LHC, dark matter relic abundance and dark matter direct detection limits by LUX. The dark gauge boson plays a crucial role in the Coleman-Weinberg mechanism and has to be heavier than 680 GeV. The viable mass region for dark matter is from 470 GeV up to a few TeV. In the case when the two Majorana fermions have different masses, two dark matter signals at direct detection experiments could provide a distinctive signature of this model.

Item Type: Article
Keywords: Beyond Standard Model, Higgs Physics
Date: 28 January 2015
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © The Author(s) 2015. Open Access. Article funded by SCOAP3. Received: September 29, 2014; Revised: November 26, 2014; Accepted: January 12, 2015; Published: January 28, 2015.
Divisions: Faculty of Science > Department of Physics
Project code: HRZZ-IP-11-2013-8799
Publisher: Springer
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 12 Mar 2017 13:29
Last Modified: 12 Mar 2017 13:29
URI: http://digre.pmf.unizg.hr/id/eprint/5443

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