Version 10 (modified by BenjF, 4 weeks ago) (diff) 

TypeIISeesaw: Canonical type II Seesaw at NLO in QCD
Contact Information
Implementation author: Benjamin Fuks
 LPTHE / Sorbonne U.
 fuks@…
In collaboration with Miha Nemevšek and Richard Ruiz. See arXiv:1911.NNNNN [hepph].
Model Description and FeynRules Implementation
We extend the Standard Model by adding a scalar field lying in the adjoint representation of the weak groupe Δ with an hypercharge equals to 1. After electroweak symmetry breaking, this gives rise to one extra CPeven scalar Higgs Δ^{0}, one charged scalar Δ^{±} and one doublycharged scalar Δ^{±±} that are mostly of a triplet nature. The corresponding Lagrangian reads
where the extra terms respectively represents the gaugeinvariant kinetic terms for the triplet, the extra pieces to the scalar potential and the Yukawa interactions giving rise to neutrino masses. The above Lagrangian was implemented in the Feynman Gauge into FeynRules 2.3.35. QCD renormalization and R_{2} rational counterterms were determined using MoGRe v1.1, NLOCT v1.02 and FeynArts 3.9. Feynman rules were collected into a single UFO, available below. In the UFO model, four massless quarks are assumed as are zero offdiagonal CKM matrix entries. These additions permit treelevel calculations at LO and NLO in QCD and loopinduced calculations at LO in QCD using MadGraph_aMC@NLO.
In the case of a normal neutrino mass hierarchy (Mv1 < Mv2 < Mv3), the model contains 16 free parameters (on top of the Standard Model ones):
 the mass of the first neutrino Mv1 (the other neutrino masses are internal parameters);
 the squared neutrino mass differences dmsq21 (Δm_{21}^{2} > 0) and dmsq31 (Δm_{31}^{2} > 0) collected in the LH block MNU;
 the oscillation parameters th12 (θ_{12}), th13 (θ_{13}), th23 (θ_{23}), delCP (φ_{CP}), phiM1 (φ_{1}), phiM2 (φ_{2}) collected in the LH block PMNS;
 the masses of the Higgs (PDG 125), Δ^{0} (PDG 44), Δ^{±} (PDG 38) and Δ^{±±} (PDG 44) fields (in the LH block MASS);
 the triplet vev v_{Δ} (block VEVD)
 two quartic couplings collected in the block QUARTICS
In the case of an inverted neutrino mass hierarchy (Mv3 < Mv1 < Mv2), the model contains 16 free parameters (on top of the Standard Model ones):
 the mass of the third neutrino Mv3 (the other neutrino masses are internal parameters);
 the squared neutrino mass differences dmsq21 (Δm_{21}^{2} > 0) and dmsq32 (Δm_{32}^{2} < 0) collected in the LH block MNU;
 the oscillation parameters th12 (θ_{12}), th13 (θ_{13}), th23 (θ_{23}), delCP (φ_{CP}), phiM1 (φ_{1}), phiM2 (φ_{2}) collected in the LH block PMNS;
 the masses of the Higgs (PDG 125), Δ^{0} (PDG 44), Δ^{±} (PDG 38) and Δ^{±±} (PDG 44) fields (in the LH block MASS);
 the triplet vev v_{Δ} (block VEVD)
 two quartic couplings collected in the block QUARTICS
More information can be found in arXiv:1911.NNNNN [hepph].
Model Files (and more)
 MoGRe_v1.1.m: The MoGRe plugin to FeynRules (version 1.1).
 Files common for both the normal and inverted mass hierarchy cases
 sm_reduced.fr: Accompanying reduced SM implementation.
 Restriction file relevant for the 4FNS (4 massless quarks) and 5FNS (5 massless quarks).
 Restriction file relevant for a diagonal CKM matrix.
 Files specific to a normal neutrino mass hierarchy (Mv1 < Mv2 < Mv3):
 type_ii.fr: The FeynRule Type II Seesaw implementation (version 1.1) to be used with a reduced SM implementation (only the modified SM parts are included in type_ii.fr).
 useMoGre.nb: Illustrative Mathematica notebook using MoGRe (for NLO UFO generation and counterterm/R_{2} calculations).
 typeII_4FNS_v1_1.ufo.tgz: Standalone UFO folder.
 Files specific to an inverted neutrino mass hierarchy (Mv3 < Mv1 < Mv2):
 type_ii_ih.fr: The FeynRule Type II Seesaw implementation (version 1.1) to be used with a reduced SM implementation (only the modified SM parts are included in type_ii_ih.fr).
 useMoGre_ih.nb: Illustrative Mathematica notebook using MoGRe (for NLO UFO generation and counterterm/R_{2} calculations).
 typeII_ih_4FNS_v1_0.ufo.tgz: Standalone UFO folder.
Attachments (10)
 sm_reduced.fr (21.4 KB)  added by BenjF 4 weeks ago.
 Massless_4f.rst (724 bytes)  added by BenjF 4 weeks ago.
 Massless_5f.rst (781 bytes)  added by BenjF 4 weeks ago.
 DiagonalCKM.rst (523 bytes)  added by BenjF 4 weeks ago.
 useMoGre.nb (26.5 KB)  added by BenjF 4 weeks ago.
 useMoGre_ih.nb (26.4 KB)  added by BenjF 4 weeks ago.

type_ii.fr
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added by BenjF 3 weeks ago.
version 1.2

type_ii_ih.fr
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added by BenjF 3 weeks ago.
version 1.1

typeII_ih_4FNS_v1_1.ufo.tgz
(195.9 KB) 
added by BenjF 3 weeks ago.
IH  v1.1

typeII_4FNS_v1_2.ufo.tgz
(195.9 KB) 
added by BenjF 3 weeks ago.
NH  v1.2
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