Shining light on the scotogenic model: interplay of colliders and cosmology
- PDF / 861,573 Bytes
- 33 Pages / 595.276 x 841.89 pts (A4) Page_size
- 24 Downloads / 151 Views
Springer
Received: December 27, Revised: August 3, Accepted: August 25, Published: September 21,
2019 2020 2020 2020
Sven Baumholzer,a Vedran Brdar,b Pedro Schwallera and Alexander Segnera a
PRISMA+ Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg-Universit¨ at Mainz, 55099 Mainz, Germany b Max-Planck-Institut f¨ ur Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
E-mail: [email protected], [email protected], [email protected], [email protected] Abstract: In the framework of the scotogenic model, which features radiative generation of neutrino masses, we explore light dark matter scenario. Throughout the paper we chiefly focus on keV-scale dark matter which can be produced either via freeze-in through the decays of the new scalars, or from the decays of next-to-lightest fermionic particle in the spectrum, which is produced through freeze-out. The latter mechanism is required to be suppressed as it typically produces a hot dark matter component. Constraints from BBN are also considered and in combination with the former production mechanism they impose the dark matter to be light. For this scenario we consider signatures at High Luminosity LHC and proposed future hadron and lepton colliders, namely FCC-hh and CLIC, focusing on searches with two leptons and missing energy as a final state. While a potential discovery at High Luminosity LHC is in tension with limits from cosmology, the situation greatly improves for future colliders. Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM, Neutrino Physics ArXiv ePrint: 1912.08215
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP09(2020)136
JHEP09(2020)136
Shining light on the scotogenic model: interplay of colliders and cosmology
Contents 1 Introduction
1
2 The model and neutrino masses
2 4 5 7 11 12
4 HL-LHC projections 4.1 Di-tau+ E T 4.2 Di-lepton+ E T
14 16 19
5 Future colliders 5.1 FCC-hh 5.2 CLIC 5.3 Summary of collider searches
21 21 22 25
6 Summary and conclusions
26
1
Introduction
While more than two decades have passed since the groundbreaking discovery of neutrino oscillations, which unambiguously established that the most elusive Standard Model (SM) particles are massive, the origin of neutrino mass still remains unknown. In spite of the viable scenario in which, by supplementing SM left-handed neutrino fields with righthanded components, neutrino masses are generated in the same way as for all the other fermions, the smallness of Yukawa couplings required for generating eV-scale masses has led to a much greater interest in Majorana mass models. The famous realization of the latter possiblity is the type-I seesaw model [1–4] in which neutrino masses are generated at tree-level in the presence of at least two generations of heavy neutral leptons. For “natural” O(1) values of Yukawa couplings, this model suggests that the mass scale of heavy leptons is around 1013 GeV, clearly unreachable at any terrestrial exp
Data Loading...
