TY  - JOUR
AU  - Beltran, R.
AU  - Cottin, G.
AU  - Helo, J. C.
AU  - Hirsch, M.
AU  - Titov, A.
AU  - Wang, Z. S.
PY  - 2023
DA  - 2023//
TI  - Long-lived heavy neutral leptons from mesons in effective field theory
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 015
EP  - 38pp
VL  - 01
IS  - 1
PB  - Springer
KW  - New Light Particles
KW  - SMEFT
KW  - Sterile or Heavy Neutrinos
AB  - In the framework of the low-energy effective field theory of the Standard Model extended with heavy neutral leptons (HNLs), we calculate the production rates of HNLs from meson decays triggered by dimension-six operators. We consider both lepton number-conserving and lepton-number-violating four-fermion operators involving either a pair of HNLs or a single HNL. Assuming that HNLs are long-lived, we perform simulations and investigate the reach of the proposed far detectors at the high-luminosity LHC to (i) active-heavy neutrino mixing and (ii) the Wilson coefficients associated with the effective operators, for HNL masses below the mass of the B-meson. We further convert the latter to the associated new-physics scales. Our results show that scales in excess of hundreds of TeV and the active-heavy mixing squared as small as 10(-15 )can be probed by these experiments.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2210.02461
UR  - https://doi.org/10.1007/JHEP01(2023)015
DO  - 10.1007/JHEP01(2023)015
LA  - English
N1  - WOS:000909520000005
ID  - Beltran_etal2023
ER  -