3 papers
hep-ph2026
Long-Lived HNLs via ALP Portal at the LHC
Rebeca Beltrán, Chandan Hati, Martin Hirsch +1
Heavy neutral leptons (HNLs) and axion-like particles (ALPs) are both considered well-motivated candidates for beyond the standard model (BSM) physics. If ALPs with sizable couplin…
hep-ph2026
Invisible neutron decay and light BSM particles
J. C. Helo, M. Hirsch, T. Ota
In Standard Model Effective Field Theory (SMEFT), invisible neutron decay arises from d = 12 operators. Adding new light particles to the field content of the SM, such as right-han…
hep-ph2025
Leading large contributions to Lepton Number Violating Meson Decays
Andrea Donini, Marcela González, Martin Hirsch +1
Lepton number violating meson decays, such as , provide constraints on operators. RGE-improved bounds on the Wilson coefficients of…