In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2021, No. 7 ( 2021-07)
Abstract:
We implement a minimal linear seesaw model (LSM) for addressing the Quasi-Dirac (QD) behaviour of heavy neutrinos, focusing on the mass regime of M N ≲ M W . Here we show that for relatively low neutrino masses, covering the few GeV range, the same-sign to opposite-sign dilepton ratio, R ℓℓ , can be anywhere between 0 and 1, thus signaling a Quasi-Dirac regime. Particular values of R ℓℓ are controlled by the width of the QD neutrino and its mass splitting, the latter being equal to the light-neutrino mass m ν in the LSM scenario. The current upper bound on m ν 1 together with the projected sensitivities of current and future | U N ℓ | 2 experimental measurements, set stringent constraints on our low-scale QD mass regime. Some experimental prospects of testing the model by LHC displaced vertex searches are also discussed.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP07(2021)154
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2021
detail.hit.zdb_id:
2027350-2
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