{mu}-{tau} symmetry, sterile right-handed neutrinos, and leptogenesis

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.013005· OSTI ID:21035679

Riazuddin, ^[1]

---

1. National Centre for Physics, Quaid-i-Azam University, Islamabad (Pakistan)

Leptogenesis is studied in a seesaw model with {mu}-{tau} symmetry for SU{sub L}(2)-singlet right-handed neutrinos. It is shown that lepton asymmetry is not zero and is given by the square of the solar neutrino mass difference and can be of the right order of magnitude. Further it involves the same Majorana phase which appears in the neutrinoless double {beta}-decay. In this framework one of the right-handed seesaw partners of light neutrinos can be made massless. This can be identified with a sterile neutrino, once it acquires a tiny mass ({approx_equal}1 eV) when {mu}-{tau} symmetry is broken in the right-handed neutrino sector. The above mentioned sterile neutrino together with another one can be identified to explain the MiniBooNE and LSND results. The light 5x5 neutrino mass matrix is completely fixed if CP is conserved and so is the effective mass for neutrinoless double {beta}-decay.

• OSTI ID: 21035679
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CP INVARIANCE
DOUBLE BETA DECAY
EFFECTIVE MASS
EV RANGE
KOBAYASHI-MASKAWA MATRIX
MASS DIFFERENCE
REST MASS
SOLAR NEUTRINOS
STANDARD MODEL
SU-2 GROUPS
SYMMETRY
SYMMETRY BREAKING