Monochromatic neutrinos generated by dark matter and the seesaw mechanism

Dudas, Emilian; Mambrini, Yann; Olive, Keith A.

doi:10.1103/PhysRevD.91.075001

Monochromatic neutrinos generated by dark matter and the seesaw mechanism

Emilian Dudas
(
- Ecole Polytechnique, CPHT
)
,
Yann Mambrini
(
- Orsay, LPT
)
,
Keith A. Olive
(
- Minnesota U., Theor. Phys. Inst. and
- Minnesota U.
)

Dec 10, 2014

8 pages

Published in:

Phys.Rev.D 91 (2015) 075001

Published: Apr 2, 2015

e-Print:

1412.3459 [hep-ph]

DOI:

10.1103/PhysRevD.91.075001

Report number:

CPHT-RR095.1214,
LPT-Orsay-14-88,
UMN-TH-3415-13,
FTPI-MINN-14-44

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Abstract: (APS)

We study a minimal extension of the Standard Model where a scalar field is coupled to the right-handed neutrino responsible for the seesaw mechanism for neutrino masses. In the absence of other couplings, below 8 TeV the scalar A has a unique decay mode A→νν, ν being the physical observed light neutrino state. Above 8 TeV (11 TeV), the 3-body (4-body) decay modes dominate. Imposing constraints on neutrino masses mν from atmospheric and solar experiments implies a long lifetime for A, much larger than the age of the Universe, making it a natural dark matter candidate. Its lifetime can be as large as 1029 seconds, and its signature below 8 TeV would be a clear monochromatic neutrino signal, which can be observed by ANTARES or IceCube. Under certain conditions, the scalar A may be viewed as a Goldstone mode of a complex scalar field whose vacuum expectation value generates the Majorana mass for νR. In this case, we expect the dark matter scalar to have a mass ≲10 GeV.

Note:

7 pages, 4 figures, version accepted for publication in PRD [references and 3/4- body decay added in the analysis for completeness]

95.35.+d
12.60.-i
12.60.Fr
14.60.St
neutrino: mass
neutrino: solar
neutrino: atmosphere
field theory: scalar
dark matter: scalar
dark matter: lifetime

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