How to find neutral leptons of the nuMSM
TLDR
In this paper, a lower and an upper bound on the strength of interaction of neutral leptons was established from cosmological considerations and from the data on neutrino oscillations.Abstract:
An extension of the Standard Model by three singlet fermions with masses smaller than the electroweak scale allows to explain simultaneously neutrino oscillations, dark matter and baryon asymmetry of the Universe. We discuss the properties of neutral leptons in this model and the ways they can be searched for in particle physics experiments. We establish, in particular, a lower and an upper bound on the strength of interaction of neutral leptons coming from cosmological considerations and from the data on neutrino oscillations. We analyse the production of neutral leptons in the decays of different mesons and in $pp$ collisions. We study in detail decays of neutral leptons and establish a lower bound on their mass coming from existing experimental data and Big Bang Nucleosynthesis. We argue that the search for a specific missing energy signal in kaon decays would allow to strengthen considerably the bounds on neutral fermion couplings and to find or definitely exclude them below the kaon threshold. To enter into cosmologically interesting parameter range for masses above kaon mass the dedicated searches similar to CERN PS191 experiment would be needed with the use of intensive proton beams. We argue that the use of CNGS, NuMI, T2K or NuTeV beams could allow to search for singlet leptons below charm in a large portion of the parameter space of the nuMSM. The search of singlet fermions in the mass interval 2-5 GeV would require a considerable increase of the intensity of proton accelerators or the detailed analysis of kinematics of more than 10^{10} B-meson decays.read more
Citations
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A facility to search for hidden particles at the CERN SPS: the SHiP physics case.
Sergey Alekhin,Wolfgang Altmannshofer,Takehiko Asaka,Brian Batell,Fedor Bezrukov,Kyrylo Bondarenko,Alexey Boyarsky,Ki-Young Choi,Cristóbal Corral,Nathaniel Craig,David Curtin,Sacha Davidson,Sacha Davidson,André de Gouvêa,Stefano Dell'Oro,Patrick deNiverville,P. S. Bhupal Dev,Herbi K. Dreiner,Marco Drewes,Shintaro Eijima,Rouven Essig,Anthony Fradette,Björn Garbrecht,Belen Gavela,Gian F. Giudice,Mark D. Goodsell,Mark D. Goodsell,Dmitry Gorbunov,Stefania Gori,Christophe Grojean,Alberto Guffanti,Thomas Hambye,Steen Honoré Hansen,Juan Carlos Helo,Juan Carlos Helo,Pilar Hernández,Alejandro Ibarra,Artem Ivashko,Artem Ivashko,Eder Izaguirre,Joerg Jaeckel,Yu Seon Jeong,Felix Kahlhoefer,Yonatan Kahn,Andrey Katz,Andrey Katz,Andrey Katz,Choong Sun Kim,Sergey Kovalenko,Gordan Krnjaic,Valery E. Lyubovitskij,Valery E. Lyubovitskij,Valery E. Lyubovitskij,Simone Marcocci,Matthew McCullough,David McKeen,Guenakh Mitselmakher,Sven Moch,Rabindra N. Mohapatra,David E. Morrissey,Maksym Ovchynnikov,Emmanuel A. Paschos,Apostolos Pilaftsis,Maxim Pospelov,Maxim Pospelov,Mary Hall Reno,Andreas Ringwald,Adam Ritz,Leszek Roszkowski,Valery Rubakov,Oleg Ruchayskiy,Oleg Ruchayskiy,Ingo Schienbein,Daniel Schmeier,Kai Schmidt-Hoberg,Pedro Schwaller,Goran Senjanovic,Osamu Seto,Mikhail Shaposhnikov,Lesya Shchutska,J. Shelton,Robert Shrock,Brian Shuve,Michael Spannowsky,Andrew Spray,Florian Staub,Daniel Stolarski,Matt Strassler,Vladimir Tello,Francesco Tramontano,Anurag Tripathi,Sean Tulin,Francesco Vissani,Martin Wolfgang Winkler,Kathryn M. Zurek,Kathryn M. Zurek +95 more
TL;DR: It is demonstrated that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
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