Particle decays in the presence of a neutrino background

TL;DR

This paper calculates cross sections for reactions sensitive to the cosmic neutrino background, considering all neutrino flavors, and discusses potential experimental detection methods within the Standard Model framework.

Contribution

It provides analytical calculations of cross sections for neutrino-background reactions involving electron, muon, and tau neutrinos, expanding detection possibilities.

Findings

Reactions are sensitive to all neutrino flavors.

Cross sections are derived analytically within the Standard Model.

Potential experimental detection methods are discussed.

Abstract

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. Some possibilities of experimental observation of the neutrino background are indicated.