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Title: Why three generations?

Here, 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.
Authors:
 [1] ;  [2] ;  [3]
  1. Univ. of Tokyo, Kashiwa (Japan). ICRR, Kavli IPMU
  2. Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU; Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU
Publication Date:
Grant/Contract Number:
SC0009937
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 758; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; warm dark-matter; sterile neutrinos; massive neutrinos; x-ray; ursa-minor; search; leptogenesis; unification; constraints; decays
OSTI Identifier:
1253026
Alternate Identifier(s):
OSTI ID: 1285777