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Leptogenesis and residual CP symmetry

Leptogenesis and residual CP symmetry
Leptogenesis and residual CP symmetry
We discuss flavour dependent leptogenesis in the framework of lepton flavour models based on discrete flavour and CP symmetries applied to the type-I seesaw model. Working in the flavour basis, we analyse the case of two general residual CP symmetries in the neutrino sector, which corresponds to all possible semi-direct models based on a preserved Z 2 in the neutrino sector, together with a CP symmetry, which constrains the PMNS matrix up to a single free parameter which may be fixed by the reactor angle. We systematically study and classify this case for all possible residual CP symmetries, and show that the R-matrix is tightly constrained up to a single free parameter, with only certain forms being consistent with successful leptogenesis, leading to possible connections between leptogenesis and PMNS parameters. The formalism is completely general in the sense that the two residual CP symmetries could result from any high energy discrete flavour theory which respects any CP symmetry. As a simple example, we apply the formalism to a high energy S 4 flavour symmetry with a generalized CP symmetry, broken to two residual CP symmetries in the neutrino sector, recovering familiar results for PMNS predictions, together with new results for flavour dependent leptogenesis.
1-36
Cheng, Peng
1e49aef0-36ef-4cda-af2a-9753881419c9
Ding, Gui-Jun
65280d32-40be-4950-a54f-f130e4f8699a
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Cheng, Peng
1e49aef0-36ef-4cda-af2a-9753881419c9
Ding, Gui-Jun
65280d32-40be-4950-a54f-f130e4f8699a
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538

Cheng, Peng, Ding, Gui-Jun and King, Stephen F. (2016) Leptogenesis and residual CP symmetry. Journal of High Energy Physics, 2016 (206), 1-36. (doi:10.1007/JHEP03(2016)206).

Record type: Article

Abstract

We discuss flavour dependent leptogenesis in the framework of lepton flavour models based on discrete flavour and CP symmetries applied to the type-I seesaw model. Working in the flavour basis, we analyse the case of two general residual CP symmetries in the neutrino sector, which corresponds to all possible semi-direct models based on a preserved Z 2 in the neutrino sector, together with a CP symmetry, which constrains the PMNS matrix up to a single free parameter which may be fixed by the reactor angle. We systematically study and classify this case for all possible residual CP symmetries, and show that the R-matrix is tightly constrained up to a single free parameter, with only certain forms being consistent with successful leptogenesis, leading to possible connections between leptogenesis and PMNS parameters. The formalism is completely general in the sense that the two residual CP symmetries could result from any high energy discrete flavour theory which respects any CP symmetry. As a simple example, we apply the formalism to a high energy S 4 flavour symmetry with a generalized CP symmetry, broken to two residual CP symmetries in the neutrino sector, recovering familiar results for PMNS predictions, together with new results for flavour dependent leptogenesis.

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Accepted/In Press date: 21 March 2016
Published date: 30 March 2016
Organisations: Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 397114
URI: http://eprints.soton.ac.uk/id/eprint/397114
PURE UUID: bb010e8a-bfda-460e-9dc7-10fe12993ce7

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Date deposited: 28 Jun 2016 08:08
Last modified: 16 Dec 2019 19:51

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