portal dark matter and LHC Run-2 results
- Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics adn Astronomy
- Yamagata Univ. (Japan). Graduate School of Science and Engineering
Here, we consider a concise dark matter scenario in the minimal gauged B-L extension of the Standard Model (SM), where the global B-L (baryon number minus lepton number) symmetry in the SM is gauged, and three generations of right-handed neutrinos and a B-L Higgs field are introduced. Associated with the B-L gauge symmetry breaking by a VEV of the B-L Higgs field, the seesaw mechanism for generating the neutrino mass is automatically implemented after the electroweak symmetry breaking in the SM. In this model context, we introduce a Z2-parity and assign an odd parity for one right-handed neutrino while even parities for the other fields. Thus, the dark matter candidate is identified as the right-handed Majorana neutrino with odd Z2 parity, keeping the minimality of the particle content intact. When the dark matter particle communicates with the SM particles mainly through the B-L gauge boson (Z'BL boson), its relic abundance is determined by only three free parameters, the B-L gauge coupling (αBL), the Z'BL boson mass (mZ') and the dark matter mass (mDM). With the cosmological upper bound on the dark matter relic abundance we find a lower bound on αBL as a function of mZ'. On the other hand, we interpret the recent LHC Run-2 results on search for Z' boson resonance to an upper bound on αBL as a function of mZ'. By combining the two results we identify an allowed parameter region for this "Z'BL portal" dark matter scenario, which turns out to be a narrow window with the lower mass bound of mZ'>2.5 TeV.
- Research Organization:
- Univ. of Alabama, Tuscaloosa, AL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- SC0013680
- OSTI ID:
- 1365624
- Journal Information:
- Physical Review D, Vol. 93, Issue 7; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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