Neutrino masses in a two Higgs doublet model with a U(1) gauge symmetry
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Springer
Received: November Revised: March Accepted: April Published: April
16, 24, 10, 19,
2018 2019 2019 2019
Daniel A. Camargo,a Alex G. Dias,b T´ essio B. de Meloa,c and Farinaldo S. Queiroza a
International Institute of Physics, Universidade Federal do Rio Grande do Norte, Campus Universitario, Lagoa Nova, Natal-RN 59078-970, Brazil b Universidade Federal do ABC, Centro de Ciˆencias Naturais e Humanas, Santo Andr´e, SP, Brazil c Departamento de F´ısica, Universidade Federal da Para´ıba, Caixa Postal 5008, 58051-970, Jo˜ ao Pessoa, PB, Brazil
E-mail: [email protected], [email protected], [email protected], [email protected] Abstract: General Two Higgs Doublet Models (2HDM) are popular Standard Model extensions but feature flavor changing interactions and lack neutrino masses. We discuss a 2HDM where neutrino masses are generated via type I seesaw and propose an extension where neutrino masses are generated via a type II seesaw mechanism with flavor changing interactions being absent via the presence of a U(1) gauge symmetry. After considering a variety of bounds such as those rising from collider and electroweak precision we show that our proposal stands as a UV complete 2HDM with a dark photon where neutrino masses and flavor changing interactions are addressed. A possible dark matter realization is also discussed. Keywords: Beyond Standard Model, Gauge Symmetry, Neutrino Physics ArXiv ePrint: 1811.05488
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP04(2019)129
JHEP04(2019)129
Neutrino masses in a two Higgs doublet model with a U(1) gauge symmetry
Contents 1
2 Type I seesaw in the 2HDM-U(1)
3
3 Type II seesaw in the 2HDM-U(1) 3.1 Mass spectrum — scalars 3.2 Mass spectrum — gauge bosons
4 6 11
4 Phenomenological constraints 4.1 Electroweak precision 4.2 Collider bounds 4.2.1 LHC — Z 0 4.2.2 LHC — doubly charged scalar 4.3 LHC — Higgs 4.4 LHC — heavy Higgs 4.4.1 Belle-II and KLOE2 4.5 Accelerators 4.6 Low energy probes 4.7 Dark matter possibility
14 14 14 14 15 15 16 17 17 18 18
5 Discussion
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6 Conclusions
19
A Vacuum stability bounds 20 A.1 Vacuum stability bounds for the 2HDM-U(1) with type I seesaw mechanism 20 A.2 Vacuum stability bounds for the 2HDM-U(1) with type II seesaw mechanism 21 B Anomaly cancellation
24
C Scalar masses and mixings C.1 CP-even scalars C.2 Charged scalars
25 25 29
1
Introduction
The Standard Model (SM) is the most accurate description of nature to the electroweak and strong interactions [1–3]. The discovery of a 125 GeV spin-0 state at CERN was the last piece of the puzzle in the SM [4, 5] and established the existence of, as far as we
–1–
JHEP04(2019)129
1 Introduction
know, an elementary scalar particle in nature. However, elementary scalar particles are common figures in many beyond the SM adventures, and among those Two-Higgs-Doublet stand out [6]. The ρ parameter, ρ = m2W /(m2Z cos2 θW ) is a powerful probe to those models featuring multiple scalar particles because they may con
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