Particle decays in the presence of a neutrino background
Institute for Nuclear Research of the Russian Academy of Sciences - 60-th October Anniversary pr. 7a, Moscow 117312, Russia
Received: 23 June 2014
Accepted: 21 July 2014
Several non-threshold reactions which may be used to detect the cosmic neutrino background are presented. The corresponding cross-sections are calculated analytically within the Standard Model. These reactions are sensitive not only to the electron neutrinos but also to the muon and tau neutrinos. It is also pointed out that they mimic lepton number violation as well as angular-momentum non-conservation in muon and meson decays. Some possibilities of experimental observation of the neutrino background are indicated.
PACS: 13.15.+g – Neutrino interactions / 13.20.-v – Leptonic, semileptonic, and radiative decays of mesons / 13.35.Bv – Decays of muons
© EPLA, 2014