An $A_5$ Model of Four Lepton Generations

Chen, Chian-Shu; Kephart, Thomas W.; Yuan, Tzu-Chiang

doi:10.1007/JHEP04(2011)015

An $A_5$ Model of Four Lepton Generations

Chian-Shu Chen
(
- NCTS, Hsinchu and
- Taiwan, Inst. Phys.
)
,
Thomas W. Kephart
(
- Vanderbilt U.
)
,
Tzu-Chiang Yuan
(
- Taiwan, Inst. Phys.
)

Nov, 2010

23 pages

Published in:

JHEP 04 (2011) 015

e-Print:

1011.3199 [hep-ph]

DOI:

10.1007/JHEP04(2011)015

View in:

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Abstract: (arXiv)

We study the lepton sector of a four generations model based on the discrete flavor group

A_5

(the even permutation of five objects). The best features of the three family

A_4

model survive, including the tribimaximal pattern of three generation neutrino mixings. At leading order the three light neutrino mass relations of

m_{\nu_1} = m_{\nu_3}

and

m_{\nu_2} = 0

are predicted. The splitting of the neutrino masses can be naturally obtained as a result of the breaking of

A_{5}

down to

A_4

and a degenerate spectrum is preferred in our model. In our

A_5

model, the electron mass is zero at tree level, but calculable through quantum corrections.

Higgs Physics
Beyond Standard Model
Quark Masses and SM Parameters
Neutrino Physics
neutrino: mass
family: 3
neutrino: mixing
symmetry: A(5)
lepton: flavor
neutrino: mass difference

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An A5A_5A5​ Model of Four Lepton Generations

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An $A_5$ Model of Four Lepton Generations