PT Journal
AU Beltran, R
   Cottin, G
   Helo, JC
   Hirsch, M
   Titov, A
   Wang, ZS
TI Long-lived heavy neutral leptons from mesons in effective field theory
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2023
BP 015
EP 38pp
VL 01
IS 1
DI 10.1007/JHEP01(2023)015
LA English
DE New Light Particles; SMEFT; 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.
ER