Why three generations?

Ibe, Masahiro; Kusenko, Alexander; Yanagida, Tsutomu T.

doi:10.1016/j.physletb.2016.05.025

Why three generations?

Masahiro Ibe
(
- Tokyo U., ICRR and
- Tokyo U., IPMU
)
,
Alexander Kusenko
(
- Tokyo U., IPMU and
- UCLA
)
,
Tsutomu T. Yanagida
(
- Tokyo U., IPMU
)

Feb 9, 2016

5 pages

Published in:

Phys.Lett.B 758 (2016) 365-369

Published: Jul 10, 2016

e-Print:

1602.03003 [hep-ph]

DOI:

10.1016/j.physletb.2016.05.025

Report number:

IPMU16-0014

View in:

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Abstract: (Elsevier)

We discuss an anthropic explanation of why there exist three generations of fermions. If one assumes that the right-handed neutrino sector is responsible for both the matter–antimatter asymmetry and the dark matter, then anthropic selection favors three or more families of fermions. For successful leptogenesis, at least two right-handed neutrinos are needed, while the third right-handed neutrino is invoked to play the role of dark matter. The number of the right-handed neutrinos is tied to the number of generations by the anomaly constraints of the U(1)B−L gauge symmetry. Combining anthropic arguments with observational constraints, we obtain predictions for the X -ray observations, as well as for neutrinoless double-beta decay.

Note:

7pages, 2 figures

neutrino: right-handed
neutrino: dark matter
double-beta decay: (0neutrino)
fermion: family
anomaly: constraint
symmetry: gauge
symmetry: U(1)
B-L number
anthropic principle
baryon: asymmetry

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