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A new Littlest Seesaw model

A new Littlest Seesaw model
A new Littlest Seesaw model
We propose and discuss a new Littlest Seesaw model, realized in the tri-direct CP approach, in which the couplings of the two right-handed neutrinos to the lepton doublets are proportional to (0, −1, 1) and (1,5/2, −1/2) respectively with the relative phase η = −π/2. This model can give an excellent description of lepton flavour mixing, including an atmospheric neutrino mixing angle in the second octant, in terms of only two input parameters. We show that the observed baryon asymmetry can be generated for the lightest right-handed neutrino mass M 1 = 1.176 × 1011 GeV in SM and M 1 = 3.992 × 1010 GeV in MSSM with $\tan \beta =5$. We construct an explicit Littlest Seesaw model based on the flavour symmetry S 4 × Z 5 × Z 8 in which the desired alignments and the phase η = −π/2 are achieved.
CP violation, discrete symmetries, model building, neutrino physics
0954-3899
Chen, Ping-Tao
cf9ffb38-0e56-4800-8035-09925dd69358
Ding, Gui-Jun
65280d32-40be-4950-a54f-f130e4f8699a
King, Stephen
f8c616b7-0336-4046-a943-700af83a1538
Li, Cai-Chang
477970e9-f18d-42db-91f5-ab9099be6705
Chen, Ping-Tao
cf9ffb38-0e56-4800-8035-09925dd69358
Ding, Gui-Jun
65280d32-40be-4950-a54f-f130e4f8699a
King, Stephen
f8c616b7-0336-4046-a943-700af83a1538
Li, Cai-Chang
477970e9-f18d-42db-91f5-ab9099be6705

Chen, Ping-Tao, Ding, Gui-Jun, King, Stephen and Li, Cai-Chang (2020) A new Littlest Seesaw model. Journal of Physics G: Nuclear and Particle Physics, 47 (6), [065001]. (doi:10.1088/1361-6471/ab7e8d).

Record type: Article

Abstract

We propose and discuss a new Littlest Seesaw model, realized in the tri-direct CP approach, in which the couplings of the two right-handed neutrinos to the lepton doublets are proportional to (0, −1, 1) and (1,5/2, −1/2) respectively with the relative phase η = −π/2. This model can give an excellent description of lepton flavour mixing, including an atmospheric neutrino mixing angle in the second octant, in terms of only two input parameters. We show that the observed baryon asymmetry can be generated for the lightest right-handed neutrino mass M 1 = 1.176 × 1011 GeV in SM and M 1 = 3.992 × 1010 GeV in MSSM with $\tan \beta =5$. We construct an explicit Littlest Seesaw model based on the flavour symmetry S 4 × Z 5 × Z 8 in which the desired alignments and the phase η = −π/2 are achieved.

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A new Littlest Seesaw model - Accepted Manuscript
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Accepted/In Press date: 10 March 2020
e-pub ahead of print date: 9 April 2020
Published date: June 2020
Additional Information: Funding Information: P-TC and G-JD acknowledge the support of the National Natural Science Foundation of China under Grant Nos. 11522546 and 11835013. S F K acknowledges the STFC Consolidated Grant ST/L000296/1 and the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreements Elusives ITN No. 674896 and InvisiblesPlus RISE No. 690575. C-C L is supported by National Natural Science Foundation of China under Grant No 11847228, China Postdoctoral Science Foundation Grant Nos. 2017M620258 and 2018T110617, CPSF-CAS Joint Foundation for Excellent Postdoctoral Fellows No. 2017LH0003, the Fundamental Research Funds for the Central Universities under Grant No. WK2030040090, the Anhui Province Natural Science Foundation Grant No. 1908085QA24 and the CAS Center for Excellence in Particle Physics (CCEPP). Publisher Copyright: © 2020 IOP Publishing Ltd.
Keywords: CP violation, discrete symmetries, model building, neutrino physics

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Local EPrints ID: 440999
URI: http://eprints.soton.ac.uk/id/eprint/440999
ISSN: 0954-3899
PURE UUID: 3e3636a2-94cc-4110-9324-8a19c2875f53

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Date deposited: 27 May 2020 16:53
Last modified: 18 Jun 2022 04:01

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Contributors

Author: Ping-Tao Chen
Author: Gui-Jun Ding
Author: Stephen King
Author: Cai-Chang Li

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