20.500.12556/RUL-185469 Probing the neutrino mass through semileptonic meson decays We argue that a detailed analysis of semileptonic decays can test the possibility of a massive neutrino. The key observable, related to the forward–backward asymmetry, is exactly zero for a massless neutrino but becomes nonzero if the neutral lepton is heavy and interacts with Standard Model fields via lefthanded operators. For righthanded interactions, this quantity differs significantly from zero even for a massless righthanded neutrino. We demonstrate this explicitly using the example of a pseudoscalar meson decaying into another pseudoscalar meson. A similar discussion applies to decays into a vector meson, with an additional subtlety addressed in this work. physics of elementary particles neutrinos fizika osnovnih delcev nevtrini true false true Angleški jezik Slovenski jezik Članek v reviji 2026-08-06 11:05:01 2026-08-06 11:05:02 2026-08-07 04:08:23 0000-00-00 00:00:00 2026 0 0 Str. 035005-1-035005-12 iss. 3 Vol. 114 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.120 2470-0010 10.1103/793f-29kk 287107075 https://journals.aps.org/prd/abstract/10.1103/793f-29kk 1 918d4035-9175-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=243989 793f-29kk.pdf 793f-29kk.pdf 1 A87902A7B6182261EB9A659D5270940A 635021327b3e2674509af2029e612348993d1796b36244eed5f639318e7ef730 e4d02db4-9175-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=243990 Fakulteta za matematiko in fiziko 0 0 0