Probes of the Standard Model effective field theory extended with a right-handed neutrino

A bstract If neutrinos are Dirac particles and, as suggested by the so far null LHC results, any new physics lies at energies well above the electroweak scale, the Standard Model effective field theory has to be extended with operators involving the right-handed neutrinos. In this paper, we study th...

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Bibliographic Details
Published in:The journal of high energy physics 2019-08, Vol.2019 (8), p.1-18, Article 31
Main Authors: Alcaide, Julien, Banerjee, Shankha, Chala, Mikael, Titov, Arsenii
Format: Article
Language:English
Subjects:
Beyond Standard Model
Classical and Quantum Gravitation
Couplings
Effective Field Theories
Electroweak model
Elementary Particles
Field theory
High energy physics
Leptons
Neutrino Physics
Neutrinos
Operators
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
Searching
Standard model (particle physics)
String Theory
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Summary:A bstract If neutrinos are Dirac particles and, as suggested by the so far null LHC results, any new physics lies at energies well above the electroweak scale, the Standard Model effective field theory has to be extended with operators involving the right-handed neutrinos. In this paper, we study this effective field theory and set constraints on the different dimension-six interactions. To that aim, we use LHC searches for associated production of light (and tau) leptons with missing energy, monojet searches, as well as pion and tau decays. Our bounds are generally above the TeV for order one couplings. One particular exception is given by operators involving top quarks. These provide new signals in top decays not yet studied at colliders. Thus, we also design an LHC analysis to explore these signatures in the t t ¯ production. Our results are also valid if the right-handed neutrinos are Majorana and long-lived.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP08(2019)031